JP6142986B2 - Plant propagation body and cultivation method thereof - Google Patents

Description

  The present invention relates to a plant propagation body provided with a material for improving the growth of a plant, and a method for cultivating the plant propagation body.

  Rice is one of the three largest crops in the world, and rice is an important crop with the largest acreage in Japan. In general rice cultivation in Japan today, seedlings grown in seedling boxes are planted in Honda, which is more expensive than rice cultivation in other countries, and cost reduction is desired. . Farmers are also aging and labor saving is required. Thus, from the viewpoint of realizing cost reduction and labor saving of rice cultivation, direct sowing in which rice seeds are directly sown in Honda has been attracting attention.

  However, in direct sowing, direct seeding sowing seeds in paddy fields after paddy and paddling tends to make seedling establishment unstable, and the cause is generally considered to be lack of oxygen. Further, Non-Patent Document 1 describes that the cause is soil reduction in which a substance that receives electrons instead of oxygen is consumed after oxygen in the soil disappears.

  Accordingly, in direct sowing of flooded water, for the purpose of improving seedling establishment, a method of covering the seed surface with a material that stabilizes seedling establishment such as an oxygen generating agent is prevalent before sowing (Non-Patent Document 2). ).

  In addition, in order to avoid the occurrence of bird damage and floating seedlings, a method of sowing seeds coated with iron or the like on the surface of soil where oxygen deficiency does not occur has been attempted (Patent Document 1).

JP 2005-192458 (released July 21, 2005) International Publication WO2011 / 093431A1 (August 4, 2011)

Motoyuki Sugawara, Special Research Report No. 20 of Ishikawa Prefectural Agricultural College, “Study on seedling emergence and seedling in direct sowing of paddy rice in flooded soil”, March 1993 Ministry of Agriculture, Forestry and Fisheries Ninth Review Meeting Document 1, “Current status of direct sowing technology for rice”, p. 13, March 2008 (http://www.maff.go.jp/j/study/kome_sys/09/pdf/data1.pdf)

  However, in the method using a material such as an oxygen generating agent, the cost for the material to be coated is high, and the amount of the material necessary for the seed is large, so that it takes time and effort for the coating.

  In addition, in the method using iron or the like, seeds must be sown in the first place, and if seeds are submerged in the soil, seedling reduction occurs.

  Therefore, the inventors of the present application examined a method for improving the growth of plants using molybdenum or the like as an alternative technique, and recognized a remarkable effect (Patent Document 2). However, even with the method described in Patent Document 2, further improvement may be required. As a result of the study by the present inventors, for example, in environmental conditions such as soil and soil substitutes with low pH buffering power or acidity, functional components such as molybdate ions are unlikely to elute and it is difficult to obtain sufficient effects. Was expected.

  This invention is made | formed in view of the problem which said prior art has, The objective is to provide the improved plant propagation body and its cultivation method.

In order to solve the above problems, the present invention provides the following.
1) A first material selected from the group consisting of a molybdenum-containing material and a tungsten-containing material, and a second material that adjusts the supply of the functional component supplied from the first material by a pH adjusting action (however, , Excluding calcium peroxide), and plant propagation material applied to the surface or inside of the plant propagation material.
2) The plant propagation material according to 1), wherein the second material is a slightly soluble material having a dissolution ratio with respect to water at room temperature of 1% or less by weight.
3) The second material is selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium oxide, calcium hydroxide, calcium carbonate, zinc oxide, zinc hydroxide, zinc carbonate, bentonite, and talc. The plant propagation material according to 2), which is at least one kind.
4) The first material is metallic molybdenum, molybdenum trioxide, molybdic acid and its salt, molybdophosphoric acid and its salt, molybdosilicic acid and its salt, metal tungsten, tungsten trioxide, tungstic acid and its salt, tungstophosphoric acid The plant propagation material according to any one of 1) to 3), wherein the plant propagation material is at least one selected from the group consisting of and salts thereof, and tungstosilicic acid and salts thereof.
5) The plant propagation material according to any one of 1) to 4), wherein the plant propagation material is a grass family or leguminous plant.
6) The plant propagation material according to any one of 1) to 5), wherein the seedling establishment of the plant propagation material is improved.
7) The plant propagation material according to any one of 1) to 6), wherein the plant propagation material is a seed.
8) A method for cultivating a plant propagation body, comprising a planting step for planting the plant propagation body according to any one of 1) to 7) above.
9) The cultivation method as described in 8) which has a period when at least one part of a plant body is in a flooded state between the planting process and the seedling establishment period.
10) At least one selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium oxide, calcium hydroxide, calcium carbonate, zinc oxide, zinc hydroxide, and zinc carbonate is present on the surface or inside of the plant propagation material A plant propagation material that is applied and a material selected from the group consisting of a molybdenum-containing material and a tungsten-containing material is not applied to the surface or inside of the plant propagation material. In addition, in the plant propagation body of 10), it may be preferable that iron oxide, desirably iron oxide (III) (Fe ₂ O ₃ ) is further applied to the surface or inside of the plant propagation body.

  ADVANTAGE OF THE INVENTION According to this invention, the improved plant propagation body which shows the effect | action of a growth improvement, and its cultivation method can be provided.

It is a figure which shows the result of the test in one Example. It is a figure which shows the result of the test in another Example. It is a figure which shows the result of the test in another Example. It is a figure which shows the result of the test in another Example. It is a figure which shows the result of the test in another Example. It is a figure which shows the result of the test in another Example.

[1. (Plant propagation body)
(Outline of plant propagation material)
The plant propagation material according to the present invention is 1) a first material selected from the group consisting of a molybdenum-containing material and a tungsten-containing material, and 2) a functionality supplied from the first material by adjusting the pH. A second material for adjusting the supply of ingredients (excluding calcium peroxide), and applied to the surface or inside of the plant propagation material.

Note that “applied to the surface or the inside of the plant propagation body” means that the first material and the second material may be applied to at least one of the surface and the inside of the plant propagation body. A form in which the material is applied to the surface of the plant propagation body and the second material is applied to the inside of the plant propagation body is also included. Preferably, for example, (1) at least a part of the surface of the plant propagation material is covered with the solid first material and the second material, and (2) the surface and inside of the plant propagation material, Examples include a form in which a solution containing the first material and the second material penetrates. More preferred is the form (1). In the form (1), the first material and the second material may be mixed in the same coating layer, and the coating layer has a multilayer structure and the first material is in a different coating layer. The material and the second material may exist separately.
The term “applied to the surface of a plant propagation body” refers to a state in which materials are present integrally with the plant propagation body outside the plant propagation body.

(Type of plant propagation material, etc.)
The kind of the plant propagation body is not particularly limited, and examples thereof include vegetative propagation organs such as seeds and baskets, seedlings (seedlings), and the like, among which seeds are preferable. Specifically, the plant propagation material is, for example, seeds of gramineous plants such as paddy rice, barley and wheat; seeds of legumes such as soybean, broad bean and kidney beans; Seeds; buckwheat family seeds such as buckwheat; and the like.

  The “seed” may be a seed after removing a structure that is not essential for germination (eg, rice husk, outer seed coat, inner seed coat, etc.).

(First material)
The first material is at least one material selected from the group consisting of molybdenum material and tungsten material. Molybdenum materials and tungsten materials suppress the generation of sulfide ions in the plant growth environment by generating oxoanions. Furthermore, these oxoanions suppress the activity of microorganisms such as spoilage in the plant growth environment. Therefore, by using a molybdenum material or a tungsten material, it is possible to suppress plant seedling and a decrease in growth.

  When molybdenum material and tungsten material are compared, molybdenum material may be more preferable. More specifically, molybdenum materials have a sufficient track record of application to plants. In addition, the molybdenum material has a stronger anti-corrosion effect than the tungsten material. Tungsten has not been reported to be toxic to plants or animals.

  The type of the molybdenum material is not particularly limited as long as it contains molybdenum element, and various substances are included in its category, but a material or simple substance that supplies molybdate ions and has high safety to the target plant is selected. It is preferable to do. Therefore, the molybdenum material is composed of metallic molybdenum (single), molybdenum trioxide (anhydrous molybdic acid), molybdic acid and its salt, molybdophosphoric acid (phosphomolybdic acid) and its salt, molybdosilicic acid (silicomolybdic acid) and its salt. It is preferably at least one selected from the group. Inexpensive and commercially available metal molybdenum, molybdenum trioxide, molybdate, calcium molybdate, magnesium molybdate, ammonium molybdophosphate (ammonium phosphomolybdate), potassium molybdophosphate (potassium phosphomolybdate), ammonium molybdate And at least one selected from the group consisting of sodium molybdate, potassium molybdate, molybdophosphoric acid, molybdophosphoric acid sodium (phosphomolybdate sodium) and molybdosilicate.

  A slightly soluble molybdenum material that is slightly soluble in water is particularly preferable from the viewpoint of safety with respect to the target plant. The slightly soluble molybdenum material is a material or a simple substance having a water-soluble ratio of 10% or less (dissolves 1 g or less in 10 g of water at room temperature) at room temperature, such as metal molybdenum, molybdenum trioxide, Examples include molybdic acid, calcium molybdate, magnesium molybdate, ammonium molybdate, and potassium molybdate. In addition, polyacids and heteroacids condensed with an oxoanion, salts thereof, and materials containing them are particularly preferable from the viewpoint of safety with respect to a target plant because molybdate ions are not easily supplied.

  Among these, ammonium molybdophosphate and potassium molybdophosphate are salts of heteroacids that are slightly soluble in water and do not easily supply molybdate ions, and suppress the deterioration of plant seedling and growth. Excellent effect. Moreover, since these materials are colored yellow, it is preferable also from the point of helping to prevent accidental ingestion of the coated seeds. Furthermore, potassium molybdate may be more desirable than ammonium molybdate in that ammonia gas may not be generated.

  Similarly, the type of the tungsten material is not particularly limited as long as it contains tungsten element, and various substances are included in its category, but it is a material or simple substance that supplies tungstate ions and has high safety to the target plant. Is preferably selected. Therefore, as tungsten materials, metallic tungsten (single substance), tungsten trioxide (tungstic anhydride), tungstic acid and its salt, tungstophosphoric acid (phosphotungstic acid) and its salt, tungstosilicic acid (silicotungstic acid) and its salt It is preferably at least one selected from the group consisting of Of those that are inexpensive and commercially available, metallic tungsten, tungsten trioxide, tungstic acid, ammonium tungstate, or ammonium tungstate phosphate (ammonium phosphotungstate) is preferred.

  As in the case of molybdenum materials, tungsten materials are preferably slightly soluble, and materials in the form of polyacids or heteroacids that are difficult to supply tungstate ions are preferred. In addition, the compounds specifically exemplified by the above compound names are all slightly soluble. In addition, ammonium tungstophosphate and potassium tungstate phosphate are salts of hetero acids that are slightly soluble in water and do not easily supply tungstate ions.

  In addition, although the usage-amount of molybdenum material and tungsten material is not specifically limited, For example, when a plant propagation body is a seed, it is 0.01 mol or more and 10 mol or less as molybdenum element or tungsten element with respect to 1 kg of air-dried seed weight. Should be within the range.

  In addition, the material whose specific name is given as the first material is not only the material actually contained in the plant propagation material (including the material produced in the process of manufacturing or using the plant propagation material), but also the production of the plant propagation material. It can be used as a raw material to be used. That is, the plant propagation material may be changed to a different compound by adding another material that reacts with the first material before or during treatment of the plant propagation material.

(Second material)
The second material is a material that adjusts (preferably promotes) supply of the functional component supplied from the first material by its pH adjusting action. Further, the second material stabilizes the functional component supplied from the first material. The first material generates an oxoanion, which is a functional component, in the presence of liquid (water). The production of oxoanions also depends on the pH in the environment, and the supply amount tends to increase as the pH increases. Further, since the oxoanion is an anion, it can exist stably due to the presence of a paired cation. In order to stably supply the oxoanion, which is a functional component, from the first material, the second material raises the pH more than the action of the soil alone in the absence of the second material, or the pH is increased. Do not let it descend. In other words, the second material, in one example, raises the pH of the surrounding environment of the plant propagation body indicated by the action of the pH buffering force of these (especially soil) in the soil or soil substitute, or pH It is a material that promotes the supply of oxoanions from the first material without lowering.

  An example of the second material is an alkaline material (which dissolves in water to give an alkaline solution), but may be a material having a buffering force so as to remain neutral in acid alkali, and is not particularly limited to an alkaline material. However, calcium peroxide that acts as an oxygen generator is excluded from the second material.

  The second material is preferably a slightly soluble material having a dissolution ratio with respect to water of 1% or less by weight at room temperature (dissolves 0.1 g or less with respect to 10 g of water at room temperature). This is because it is difficult to act on the first material when it is treated on the seeds using the solution or after treatment, and when it comes into contact with sufficient moisture after being sown in the soil, etc. This is because it is more preferable from the viewpoint of acting and promoting the supply of an oxoanion which is a functional component. Although it does not specifically limit as a slightly soluble material, For example, it consists of magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium oxide, calcium hydroxide, calcium carbonate, zinc oxide, zinc hydroxide, zinc carbonate, bentonite, and talc. At least one selected from the group can be mentioned. Among these, magnesium oxide, magnesium hydroxide, magnesium carbonate, and calcium carbonate may be preferable because they have a strong effect of suppressing a decrease in pH, are unlikely to excessively increase in pH, and are less likely to damage seeds. Among these, magnesium oxide may be desirable from the viewpoint of a small amount of material and a small amount, and a small bulk. Among the magnesium oxides, heavy oxides heated at a high temperature and magnesium oxide called electromelting may be preferable because of their lower solubility and low bulk. Further, the magnesium material may be preferable because it has a sufficient track record of being used as a fertilizer component. In addition, zinc oxide, which has low solubility, high safety, and is available at a relatively low price, can adjust the pH to near neutral in both acidic and alkaline soils because zinc is an amphoteric element. It may be preferable in that it can be used even by plants that are weak to the environment. Bentonite and talc may be preferable because they are significantly cheaper than other materials.

  In addition, as a second material, a water-soluble material (that is, a material that dissolves better than slightly soluble) is not denied. Even in the case of water-soluble materials, if necessary, a carrier that can absorb the water-soluble material at the time of dissolution (for example, clay or iron oxide) is used together, or a material that prevents the solution from moving (for example, PVA or latex having a high degree of saponification) Etc.) can be used to suppress runoff and absorption by seeds.

  The amount of the second material used is not particularly limited. For example, when the plant propagation material is seeds, molybdate ions or tungstate ions, which are divalent anions, per 1 kg of air-dried seed weight. The amount of cation that is ionically equal to the amount in the range of 0.1 mol or more and 50 mol or less can be supplied. For example, if it is a material which supplies a bivalent cation, what is necessary is just to make it the quantity which contains or can supply a bivalent cation in 0.1 mol or more and 50 mol or less. If it prescribes | regulates with the magnification with respect to 1st material, for example, the quantity (mol) of the cation supplied from a 2nd material with respect to the quantity (mol) of the molybdate ion and tungstate ion supplied from a 1st material. ) Is in the range of 0.5 to 300 times as an ionic equivalent considering the valence.

  In addition, the material whose specific name is given as the second material is used for the production of plant propagation material in addition to those actually contained in plant propagation material (including those produced in the process of production or use of plant propagation material). It can be used as a raw material to be used. That is, the plant propagation material may be changed to a different compound by adding another material that reacts with these second materials before or during the treatment of the plant propagation material.

(Other materials)
The plant propagation material which concerns on this invention may contain materials, such as an iron material or clay, as needed other than the said 1st and 2nd material. Although the kind of iron material is not particularly limited, specifically, for example, reduced iron (Fe), iron oxide (III) (Fe ₂ O ₃ ), iron oxide (II, III) (Fe ₃ O ₄ ), oxidation Iron (II) (FeO) etc. are mentioned, These compositions may be sufficient.

(Manufacturing example of plant propagation material)
The manufacturing method of the plant propagation body provided with the first and second materials is not particularly limited, and the first and second materials may be applied to the plant propagation material by an appropriate method. When the plant propagation material is a coated seed, specifically, for example, 1) The first and second materials in solid form (including powder) are sufficiently mixed, and the plant propagation material such as seeds is mixed there. And a method of forming a plastic coating layer on the surface of the plant propagation body while adding an appropriate amount of liquid (water, etc.) using a sprayer or the like, 2) solid first and second materials, and Mix the liquid in suspension, stir it, add plant propagation material such as seeds to it, and add additional materials other than liquid (for example, add the first and second materials). 3) Until the water content is relatively reduced and a plastic coating layer is formed, and 3) Until the plant propagation body such as seeds is added and suspended and stirred, the same as in 2), followed by heat, ventilation, And / or neglected (in combination with other operations such as storage or transportation, the moisture content gradually increases over time) The process of lowering is also included in the category of neglected), etc., to reduce the moisture and form a plastic coating layer, 4) until the plant propagation body such as seeds is added and suspended, and 2) In the same manner, a method for removing the plant propagation material from the liquid and forming a plastic covering layer on the surface of the plant propagation material, 5) the surface or the inside of the plant propagation material (for example, allowing the plant propagation material to absorb water) And a method of forming a plastic coating layer on the surface of the plant propagation body by applying a liquid to the substrate in advance and then applying the solid first and second materials. However, the plant propagation material may be mixed with the first and second materials from the beginning, or may be mixed with the first and second materials after the plant propagation material is sufficiently moistened in advance. . These may be mixed at the same time, or the order may be appropriately changed.

  Moreover, you may evaporate a liquid from the said coating layer formed by forced drying or natural drying as needed.

  Moreover, when the planting (concept including sowing) can be stored, the moisture remaining in the plant propagation body does not need to be dried.

  In addition, it is preferable that said coating layer does not contain sulfur components, such as a sulfate or a sulfate ion substantially. Here, “does not contain a sulfur component” means that a component containing a sulfur atom is not substantially contained. The component containing a sulfur atom refers to, for example, a sulfate or sulfate ion, and examples of specific compound names include calcium sulfate, magnesium sulfate, potassium sulfate, and ammonium sulfate. That is, in the present invention, it is preferable that gypsum or the like is not included in the components constituting the coating layer. Therefore, when using a binder in order to attach the first material and the second material to the plant propagation material, it is preferable to use polyvinyl alcohol (particularly one having a high degree of saponification).

[2. Plant cultivation method)
This invention also provides the method of planting the obtained plant propagation body and cultivating a plant. That is, the plant propagation body which concerns on this invention is cultivated until it becomes a plant body of the magnitude | size which can be used after planting (planting process).

  The method for planting a plant propagation material is not particularly limited. For example, in the case of coated seeds coated with the first and second materials (including coating by adhesion using a binder or the like), a spot seeding machine or a row seeding machine is used. Alternatively, it may be sown on farmland or the like using a seeding machine such as a seeding machine, or may be sown directly by a human hand. Moreover, what is necessary is just to plant by a planting machine or a hand, when a plant propagation body is the young plant (seedling) to which the 1st and 2nd material was made to adhere.

  Plant propagation is planted, for example, on soil or soil substitutes. Here, the soil substitute refers to a medium capable of growing plants instead of soil, such as artificial soil (peat moss, etc.), a medium for hydroponics, and the like.

  In an example of the cultivation method according to the present invention, the plant propagation material is planted and / or budding at least temporarily under conditions of flooding. The said plant propagation body exhibits an effect especially for the growth improvement (for example, seedling improvement) of the plant in a flooded state. The conditions for at least temporarily flooding include not only long-term flooding such as paddy fields and hydroponics, but also the case of temporary flooding due to heavy rain.

  Moreover, in this invention, the said planting process may be performed with the form of flooded direct seeding. Here, flooded direct sowing means direct sowing (direct sowing) on flooded soil or soil substitutes. The flooded soil or soil substitute is, for example, paddy fields after substitution, hydroponic medium, fields flooded with rain, soil with poor drainage, or soil substitutes. The “paddy field” is not limited to the cultivated land where rice is cultivated, but may be any cultivated land where water is drawn to grow the crop.

  Moreover, in this invention, the said planting process may be performed with the form of dry rice seeding. Here, direct sowing of dry fields means direct sowing (direct sowing) on soil in a field or soil substitute. In this case, if it is flooded by rain or the like, it can be effective in improving growth (for example, raising seedling establishment).

  In the present invention, instead of depending on the pH buffering power of the soil, the supply of the functional component from the first material is actively adjusted (preferably promoted) by the second material. In soils with low pH buffering power (soils whose pH is likely to change when an acid or alkaline agent is added. For example, sandy soils with a simple structure compared to clayy soils have a strong tendency). Particularly effective. The effect is also expected in acidic soil where the supply of the functional component of the first material is difficult to proceed. Furthermore, when the plant cultivation environment is inferior, etc., a higher effect can be expected because the functional component can be actively dissolved and the functional component can be applied.

[3. More specific examples of coated seeds)
Hereinafter, more specific structural examples of coated seeds which are one form of the plant propagation material according to the present invention will be shown.

<Configuration example 1>
First material: at least one selected from the group consisting of potassium molybdate, ammonium molybdate, and molybdenum trioxide. Potassium molybdate is preferred. Powdery. Molybdenum element per kg of air-dried seed is used in the range of 0.05 mol or more and 0.5 mol or less. A range of 0.1 mol or more and 0.2 mol or less is desirable.
Second material: at least one selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium carbonate, zinc oxide, bentonite, and talc. Magnesium oxide is desirable, and magnesium oxide that is described as heavy or electrofused by high temperature heating is more desirable. Powdery. Magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium carbonate, or zinc oxide is in the range of 0.5 to 50 times the equivalent amount of the metal element equivalent to the molybdenum element contained in the first material (however, If you don't actively inundate, such as field crops or paddy rice direct sowing, the range is 0.5 to 2 times the metal element equivalent to the molybdenum element in the first material.) For bentonite or talc, ranges from 0.1 to 2 times the weight of air-dried seeds.
Materials to be added as needed: At least one selected from the group consisting of iron oxide and clay in order to increase the weight. Powdery. Range from 0.1 to 2 times the weight of air-dried seeds. Sometimes it is not added.
Binder (binder): Polyvinyl alcohol powder having a polymerization degree of 1500 to 3500 and a saponification degree of 90 to 98 mol%. A range from 1% to 3% weight of the total weight of the first material, the second material, and the material added as necessary.
The kind of seed is not limited. The outer surface of the seed is coated with a composition in which the first material, the second material, a material added as necessary, and PVA are mixed.

<Configuration example 2>
First material: molybdenum trioxide. It is used within the range of 0.01 mol or more and 0.2 mol or less, or 0.01 mol or more and 0.1 mol or less of molybdenum element per kg of air-dried seeds.
Second material: at least one selected from the group consisting of magnesium oxide and magnesium hydroxide. Magnesium oxide is desirable, and magnesium oxide that is described as heavy or electrofused by high temperature heating is more desirable. Powdery. It is used within a range of 1 mol or more and 5 mol or less as metal magnesium per kg of air-dried seeds.
Materials added as necessary: Iron oxide to increase weight and hydrophilicity. Desirably iron (III) oxide (Fe ₂ O ₃ ). Also included is a category in which reduced iron is coated and oxidized to iron oxide after coating. Powdery. Iron oxide having a particle size of 10 μm or less is preferable, iron oxide having a particle size of 1 μm or less is more preferable, and iron oxide having a particle size of 0.1 to 1 μm is more preferable. Used in the range of 0.05 to 0.5 times the weight of air-dried seeds. It may not be added if necessary.
Binder (binder): Polyvinyl alcohol powder having a polymerization degree of 1500 to 3500 and a saponification degree of 90 to 98 mol%. The range from 0.1% weight to 2% weight of the total weight of the first material, the second material, and the material added as necessary.
The kind of seed is not limited. The outer surface of the seed is coated with a composition in which the first material, the second material, a material added as necessary, and PVA are mixed.

<Configuration example 3>
First material: Do not use. Alternatively, molybdenum trioxide is used in the range of 0 to 0.01 mol.
Second material: at least one selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium oxide, calcium hydroxide, calcium carbonate, zinc oxide, zinc hydroxide, and zinc carbonate. More preferably, at least one selected from the group consisting of magnesium oxide and magnesium hydroxide. Among these, magnesium oxide is preferable, and magnesium oxide that is described as heavy or electrofused by high-temperature heating is more preferable. Powdery. Used as a metal atom (Mg, Ca, or Zn) per kg of air-dried seed within a range of 1 mol to 5 mol.
Materials added as necessary: Iron oxide to increase weight and hydrophilicity. Desirably iron (III) oxide (Fe ₂ O ₃ ). Also included is a category in which reduced iron is coated and oxidized to iron oxide after coating. Powdery. Iron oxide having a particle size of 10 μm or less is preferable, iron oxide having a particle size of 1 μm or less is more preferable, and iron oxide having a particle size of 0.1 to 1 μm is more preferable. Used in the range of 0.05 to 0.5 times the weight of air-dried seeds. It may not be added if necessary.
Binder (binder): Polyvinyl alcohol powder having a polymerization degree of 1500 to 3500 and a saponification degree of 90 to 98 mol%. Range from 0.1% weight to 2% weight of the total weight of the second material, the first material added if necessary, and the iron oxide added if necessary.
The kind of seed is not limited. The surface of the seed is coated with a composition in which the second material, the first material added as needed, the iron oxide added as needed, and the PVA are mixed.
In the coated seed of Configuration Example 3, the active ingredient that contributes to the improvement of plant seedling establishment is the first material and the second material when molybdenum trioxide is used as the first material, and the first material is When not used, it is the second material. In addition to the first material and the second material, the coated seed may not contain an active ingredient that contributes to the improvement of plant seedling establishment.
In addition, the coated seed of Configuration Example 3 may be coated only with the second material and PVA, and is further selected from the group consisting of the first material (molybdenum trioxide) and iron oxide as necessary. One or both of them may be further included.
A particularly specific example of the coated seed of the configuration example 3 is one in which the seed is coated with iron oxide, PVA, and bitter earth (magnesium oxide).

  Hereinafter, examples will be shown and the embodiment of the present invention will be described in more detail. However, the present invention is not limited to the following examples.

[Example 1: Combination of potassium molybdate and magnesium oxide (1)]
<Tests 1a to 1e>
0.2 molMo / kg (air-dried seeds; the same applies hereinafter) equivalent amount of potassium molybdate (manufactured by Nippon Shin Metals Co., Ltd., hereinafter referred to as MoPK) and magnesium oxide equivalent to molMg / kg shown in Table 1 (Wako Pure Chemical Industries, Ltd., reagent grade, heavy, hereinafter referred to as MgO) was mixed well, and 1% of the weight of the mixture (2% for tests 1c, 1d, and 1e) heavy PVA powder ( JM-17S, manufactured by Nippon Vinegar Poval Co., Ltd. Hereinafter referred to as PVA. In the coating of subsequent tests, PVA was similarly mixed with 2% by weight of the mixture weight when not individually described for PVA.) Were further mixed, sprayed with water to cover air-dried rice seeds (variety: Nikomaru), and the resulting coated seeds were air-dried.

  Wet paddy soil equivalent to 100 g of dry soil was collected in a cylindrical container having a diameter of about 7 cm and stored in a refrigerated state until it was used. As for paddy wet soil, tests 1a and 1b are from paddy fields in Chikugo City, Fukuoka Prefecture, and tests 1c to 1e are a problem with the fact that seedlings are not well established in Kamimine-cho, Saga Prefecture. The following was collected from the following.

And the aqueous solution equivalent to about 1.5 times the weight of dry soil was added to this paddy field wet soil. Aqueous solution, in dry soil 100 kg / ^{m 2} in terms were dissolved potassium chloride (reagent special grade) so as to 0.1molK / ^{m 2.} About potassium chloride, although not described individually in the following tests, it was added in all tests including Example 2 and later. In tests 1a, 1b, 1c, and 1d, ammonium sulfate (special grade reagent) was also dissolved so that the concentration was 0.4 molN / m ² . In Test 1e, ammonium hydrochloride (special grade reagent) was also dissolved so as to be 0.4 molN / m ² . In Tests 1a, 1b, 1d, and 1e, 100 mg equivalent of D (+)-maltose monohydrate (Wako Special Grade, hereinafter referred to as sugar) was added per container. Further, in Test 1b, 6N hydrochloric acid (for volumetric analysis, hereinafter referred to as an acid) equivalent to 0.2 mmol HCl was added per vessel. In either case, a reagent manufactured by Wako Pure Chemical Industries, Ltd. was used.

  Addition of sulfate groups contained in ammonium sulfate promotes the generation of harmful sulfide ions under reducing conditions. In addition, it is known that when the previous crop residue is put in, the decomposition of the previous crop residue, which is an organic matter, accelerates the reduction of the soil and inhibits seedling establishment. Maltose was added to mimic this and create harsh conditions for seedling establishment. Furthermore, depending on the soil, base leaching may proceed and may exhibit acidity. Hydrochloric acid was added to simulate such acidic soil. The container was covered and shaken at room temperature for about 1 hour, and then allowed to stand at 4 ° C. for 2 days to prepare a flooded soil.

  The above-mentioned coated seeds or untreated seeds were sown on this flooded soil. In one container, eight seeds subjected to the same treatment were sown at a depth of 15 mm and at an interval of about 2 cm, and lightly shaken to close the seeding hole. Six containers were used for each treatment. The seeded container was left in a thermostat at 20 ° C. where a fluorescent lamp was lit for only half a day without covering the container. The water depth on the soil surface was about 15 mm, and supplemented with distilled water when reduced by evaporation. About 4 weeks after sowing, the seedling establishment ratio (the ratio of the number of third leaf extracted individuals) in each container was investigated, and the average and standard error of the seedling establishment ratio by treatment were obtained.

  As shown in Table 1, in all the tests under conditions where it was difficult to establish seedlings, even when the seed was coated by adding only 0.1 to 0.5 mol Mg / kg equivalent of MgO compared to the case where MgO was not added. , Seedling has improved significantly. In Test 1b and Test 1d, which were very difficult to establish seedlings, the seedling establishment ratio was further improved with seeds coated with 5-20 mol Mg / kg equivalent of MgO.

<Test 1f>
As in Tests 1a to e, 0.2 mol Mo / kg equivalent of MoPK and 0 or 0.2 mol Mg / kg MgO were mixed well to prepare coated seeds (PVA was 2% by weight of the mixture weight). As in tests 1a to e, paddy soil of Chikugo City, Fukuoka Prefecture was packed in a container. However, the solution was not added, the soil surface was left flat, and the prepared seeds were arranged 8 by 8 on the soil surface and pressed with a plate. As in Tests 1a to 1e, the sample was placed in a thermostat at 20 ° C., and the soil was moistened with water to the extent that it did not touch the seeds. This condition is a field condition where air and moisture can be used appropriately for seeds. The number of individuals that developed the second leaf on the 11th day after sowing was investigated.

  In this test, almost all individuals emerged because they were not flooded. However, as shown in Table 2, the number of individuals that developed the second leaf until the 11th day after sowing was approximately doubled when MgO was added, suggesting that growth was promoted.

[Example 1-1: Combination of potassium molybdate and magnesium oxide (2)]
In the same manner as in Test 1a of Example 1, a test soil in which ammonium sulfate and sugar were mixed with paddy wet soil was prepared. Rice seeds (variety: Nikomaru) were immersed in distilled water at 10 ° C. for about 5 days and then at 30 ° C. for about 6 hours. In this state, the rice seeds were not germinated. 0.1 molMo / kg (air-dried seed) equivalent amount of potassium molybdate, PVA corresponding to 2% weight of this potassium molybdate, and magnesium oxide equivalent amount of molMg / kg shown in FIG. 1 (Tateho Chemical Co., Ltd.) Made of Fused Magnesia 96, Fused Magnesium Oxide Made by High-Temperature Heating) and PVA equivalent to 1% weight of this Magnesium Oxide, and sprayed with water to cover the surface of rice seeds. The coated seeds were air dried.

Next, in the same manner as in Example 1, the coated seeds were sown in the adjusted soil for testing. Then, in the same manner as in Example 1, the average seedling establishment rate and standard error at 20 ° C. were obtained. However, instead of the fluorescent lamp, a metal halide lamp (soil surface light intensity 0.4 mmol / m ² / s) was turned on every half day.

  As shown in FIG. 1, compared to the case where no magnesium oxide was added, seedling establishment was further improved with seeds coated with 0.2 to 10 mol Mg / kg equivalent of magnesium oxide.

[Example 1-2: Combination of potassium molybdophosphate, iron oxide, and magnesium oxide]
In the same manner as in Example 1-1, test soil in which ammonium sulfate and sugar were mixed with paddy wet soil was prepared. In the same manner as in Example 1-1, paddy rice seeds were immersed in distilled water to such an extent that they did not germinate. 0.2 molMo / kg (air-dried seed) equivalent amount of potassium molybdophosphate, 0.1 times the weight of air-dried seed weight, iron oxide powder (Morishita Bengar Kogyo Co., Ltd., product name: No. 1094, iron oxide (III ), 99 wt%, average particle size 0.57 μm), 2% PVA powder of this mixture was further added and mixed well, and the finally obtained mixture was combined with Example 1-1. In the same manner, rice seeds were coated. Further, magnesium oxide corresponding to molMg / kg shown in FIG. 2 (manufactured by Tateho Chemical Co., Ltd., electrofused magnesia 96) and PVA corresponding to 1% weight of magnesium oxide were mixed, and Example 1-1 In the same manner as above, paddy rice seeds were further coated, and the resulting coated seeds were air dried. That is, the obtained coated seed has an inner layer containing potassium molybdophosphate and iron oxide and an outer layer containing magnesium oxide.

  Then, in the same manner as in Example 1-1, the coated seeds were sown in the adjusted test soil, and the average seedling establishment ratio and standard error at 20 ° C. were obtained.

  As shown in FIG. 2, compared to the case where no magnesium oxide was added, seedling establishment was further improved with seeds coated with 0.2 to 20 mol Mg / kg equivalent of magnesium oxide.

[Example 2: Combination of molybdenum trioxide and magnesium oxide]
As in Test 1b of Example 1, ammonium sulfate, sugar and acid were added to adjust the flooded soil. The coated seed was prepared in the same manner as in Test 1b except that molybdenum trioxide (manufactured by Wako Pure Chemical Industries, Ltd., hereinafter referred to as MoO) was used instead of MoPK (PVA is 1% weight of the mixture weight) ), The seedling establishment ratio was examined together with untreated seeds.

  As shown in Table 3, under the soil conditions where it was difficult to establish seedlings, even with the seeds to which only 0.1 mol Mg / kg equivalent of MgO was added, the seedling establishment was improved as compared with the case where no MgO was added. Furthermore, when the amount of MgO was increased, there was a tendency that the seedling establishment ratio was further improved.

[Example 3: Combination of ammonium molybdophosphate and magnesium oxide]
Similar to Test 1a of Example 1, ammonium sulfate and sugar were added to prepare flooded soil. The coated seed was prepared in the same manner as in Test 1a except that ammonium molybdophosphate (manufactured by Wako Pure Chemical Industries, Ltd., hereinafter referred to as MoPNH) was used instead of MoPK (PVA is 1% of the weight of the mixture) ), The seedling establishment ratio was examined together with untreated seeds.

  As shown in Table 4, compared to the case where MgO was not added, the seedling establishment was improved in the coated seeds to which 0.5 mol Mg / kg equivalent of MgO was added.

[Example 4: Combination of potassium molybdate and magnesium hydroxide]
Similar to Test 1a of Example 1, ammonium sulfate and sugar were added to prepare flooded soil. The coated seed was prepared in the same manner as in Test 1a except that magnesium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd., hereinafter referred to as Mg (OH) ₂ ) was used instead of MgO (PVA is the weight of the mixture) The percentage of seedlings was examined together with untreated seeds.

As shown in Table 5, compared with the case of no addition of Mg _{(OH) 2,} the coated seeds plus 0.1~0.2molMg / kg significant amount of Mg _{(OH) 2,} was improved seedling establishment .

[Example 5: Combination of potassium molybdophosphate and zinc oxide]
A submerged soil was prepared under the conditions of Test 1a of Example 1 (added with ammonium sulfate) except that no sugar was added. The coated seeds were prepared in the same manner as in Test 1a except that zinc oxide (manufactured by Wako Pure Chemical Industries, Ltd., special grade reagent, hereinafter referred to as ZnO) was used instead of MgO (PVA is 1% by weight of the mixture). % Weight), the seedling establishment ratio was examined together with untreated seeds.

  As shown in Table 6, in the seeds to which ZnO corresponding to 0.1 to 10 mol Mg / kg was added, the seedling establishment was further improved as compared with the case where ZnO was not added.

[Example 6: Combination of potassium molybdophosphate and various materials]
<Test 6a>
Similar to Test 1a of Example 1, ammonium sulfate and sugar were added to prepare flooded soil. The seeds were untreated, the same as in test 1a except that only MgP was removed except MgO, and Mg (OH) ₂ equivalent to 0.5 mol (metal element) / kg instead of MgO. , calcium carbonate (manufactured by Wako Pure Chemical Industries, Ltd., special grade reagent. hereinafter, CaCO ₃ and notation.), ZnO, magnesium carbonate (manufactured by Wako Pure Chemical Industries, Ltd., basic, heavy. hereinafter, a MgCO ₃ Except for using the notation.), A case (combination of MoPK and each material) was prepared in the same manner as in test 1a (PVA is 1% weight of the mixture weight), and the seedling establishment ratio was examined.

  As shown in Table 7, a fixed seedling improvement effect can be obtained with only MoPK compared to no treatment, but seedling establishment was further improved with the coated seeds in which the above materials were mixed with MoPK.

<Test 6b>
In the same manner as in Example 5, ammonium sulfate was added to the poor soil used in Test 1d of Example 1 to prepare a flooded soil. As in Test 6a, the seeds were untreated, MoPK only, and 2 mol (metal element) / kg equivalent of MgCO ₃ , MgO, Mg (OH) ₂ , CaCO ₃ , oxidized in addition to MoPK. A case of using calcium (manufactured by Wako Pure Chemical Industries, Ltd., hereinafter referred to as CaO) in combination was prepared (PVA is 2% by weight of the mixture weight), and the seedling establishment ratio was examined.

  As shown in Table 8, a constant seedling improvement effect can be obtained with only MoPK compared to no treatment, but seedling establishment was further improved with coated seeds in which these materials were mixed with MoPK.

<Test 6c>
To the poor soil used in Test 1d of Example 1, ammonium sulfate was added as in Test 6b, and an acid was added as in Test 1b (but no sugar was added) to prepare a flooded soil. In addition to the seeds treated in the same manner as in each test 6b (but not MoPK only), MoPK is equivalent to 2 mol Ca / kg of calcium hydroxide (made by Wako Pure Chemical Industries, Ltd., reagent grade). , Ca (OH) _2. ) Was used together (PVA was 2% weight of the mixture weight), and the seedling establishment ratio was examined.

  As shown in Table 9, seedlings were not obtained without treatment, but the seedlings were further improved with the coated seeds mixed with these materials.

<Test 6d>
The flooded soil was adjusted under the same conditions as in Test 1b of Example 1 except that no sugar was added. In the same manner as in Test 6c, the coated seeds are only MoPK, and in addition to MoPK, bentonite (made by Hojun Co., Ltd., Haruna) or talc (talc) 5 brands (A: Fuji Talc Kogyo Co., Ltd., PK-50, B: Same, NK-48, C: Takehara Chemical Industry Co., Ltd., T Talc, D: Nippon Talc Co., Ltd., SW, E: Fukuoka Talc Industrial Co., Ltd. And CX-A) were used together (PVA was 2% of the weight of the mixture), and the seedling establishment ratio was examined in the same manner.

  As shown in Table 10, seedling establishment was further improved in the coated seeds obtained by mixing MoPK with these materials.

[Example 7: Magnesium oxide only (1)]
In the same manner as in Example 5, ammonium sulfate was added to create a flooded soil. The seeds were tested without using MoPK, except that the seeds were coated with 0 to 12.4 mol Mg / kg equivalent of MgO or 0 to 10 mol Zn / kg equivalent of ZnO (PVA is 1% weight of the mixture weight). Created in the same way. Then, the coated seeds were sown in the created flooded soil, and the seedling establishment ratio was similarly examined. Furthermore, the soil adjustment was the same, and seeds coated with ZnO, MgCO ₃ , MgO, Mg (OH) ₂ , CaO, Ca (OH) ₂ in an amount equivalent to 10 mol (metal element) / kg were also prepared (PVA is 2% by weight of the mixture weight), in the same manner, after sowing, leave in an incubator at 20 ° C. set to turn on an artificial light (illuminance is about 0.4 mmol / m ² / s) only for half a day. Similarly, the seedling establishment ratio was examined.

  As shown in Tables 11 to 13, a certain seedling improvement effect was obtained by coating these materials such as MgO and ZnO.

[Example 7-1: Case of only magnesium oxide (2)]
A flooded soil was prepared in the same manner as in Example 7 except that the amount of ammonium sulfate was reduced to 0.1 mol N / m ² so that the conditions were such that sulfide ions were not easily generated. A mixture obtained by mixing 1% by weight of PVA with magnesium oxide equivalent to molMg / kg shown in FIG. 3 (manufactured by Wako Pure Chemical Industries, Ltd., reagent grade, heavy) was prepared in the same manner as in Example 7. Then, the rice seeds were coated, and the obtained coated seeds were sown in flooded soil. In the same manner as in Example 1, the average seedling establishment ratio and standard error at 20 ° C. using a fluorescent lamp were obtained.

  As shown in FIG. 3, compared to the case where no magnesium oxide was added, the seedling establishment was improved with paddy rice seeds coated with 0.05 to 5 mol Mg / kg equivalent of magnesium oxide. Compared to Example 7, it was shown that the effect of improving seedling establishment can be obtained with a smaller amount of magnesium oxide.

[Example 7-2: Combination of magnesium oxide and iron oxide]
A flooded soil was prepared in the same manner as in Example 7-1. Iron oxide powder 0.1 times the weight of air-dried seeds (Morishita Bengar Kogyo Co., Ltd., product name: No. 1094) and magnesium oxide equivalent to mol Mg / kg shown in FIG. 4 (Tateho Chemical Co., Ltd.) And 1% PVA of the obtained mixture was further mixed to obtain a coating mixture. In the same manner as in Example 7-1, the coating mixture was coated on paddy rice seeds, and the obtained coated seeds were sown in flooded soil. In the same manner as in Example 7-1, the average seedling establishment ratio and standard error at 20 ° C. were obtained.

  As shown in FIG. 4, compared to the case where no magnesium oxide was added, the seedling establishment was improved with paddy rice seeds coated with 0.12 to 12.4 mol Mg / kg equivalent of magnesium oxide.

[Example 7-3: Combination of magnesium hydroxide and iron oxide]
The flooded soil was adjusted in the same manner as in Example 7-2. Iron oxide powder 0.1 times the weight of air-dried seed (Morishita Bengar Kogyo Co., Ltd., product name: No. 1094) and magnesium hydroxide equivalent to mol Mg / kg shown in FIG. And 1% PVA of the resulting mixture was further mixed to obtain a coating mixture. In the same manner as in Example 7-2, the mixture for coating was coated on paddy rice seeds, and the obtained coated seeds were sown on flooded soil. In the same manner as in Example 7-2, the average seedling establishment ratio and standard error at 20 ° C. were determined.

  As shown in FIG. 5, compared to the case where magnesium hydroxide was not added, the seedling establishment was improved with paddy rice seeds coated with 0.05 to 5 mol Mg / kg equivalent of magnesium hydroxide.

[Example 7-4: Combination of various materials and iron oxide]
A flooded soil was prepared in the same manner as in Example 7-3. As in Example 6, 2 mol (s) of any one of zinc oxide (ZnO), magnesium carbonate (MgCO ₃ ), calcium carbonate (CaCO ₃ ), calcium oxide (CaO), and calcium hydroxide (Ca (OH) ₂ ) (Metal element) / kg and iron oxide powder 0.1 times the weight of air-dried seed weight (Morishita Bengar Kogyo Co., Ltd., product name: No. 1094) are mixed, and 1% PVA of this mixture weight Were further mixed to obtain a coating mixture. In the same manner as in Example 7-3, paddy rice seeds were coated with the coating mixture, and the obtained coated seeds were sown in flooded soil. In the same manner as in Example 7-3, the average seedling establishment ratio and standard error at 20 ° C. were obtained. In addition, the case where the rice seed was covered only with iron oxide powder and PVA was also examined.

  As shown in FIG. 6, compared to the case of only iron oxide powder and PVA (described as “nothing”), when any of zinc oxide, magnesium carbonate, calcium carbonate, calcium oxide, calcium hydroxide is added, Seedling has improved.

[Example 8: Effect on wheat]
<Test 8a>
In the same manner as in Example 5, ammonium sulfate was added to create a flooded soil. However, in this test, an ammonium sulfate aqueous solution corresponding to about 0.6 times the weight of dry soil was added. The amount of solute added was the same as in Test 5, and only the amount of water was reduced so that the water surface was close to the soil surface.

As shown in Table 14, mixed seeds were prepared in the same manner as in Example 5 except that the amounts of MoPK and MgO were changed and mixed, and wheat seeds (variety: Chikugoizumi) were used instead of paddy rice seeds (PVA is the weight of the mixture) 3% weight). The coated seeds and untreated seeds were sown on the soil surface and pushed into the soil with a plate. Then, it was left still in a 20 degreeC thermostat set so that an artificial light (illuminance is about 0.4 mmol / m < ² > / s) may be lighted only for half a day. The water depth on the soil surface was about 15 mm, and the seeds were repeatedly pushed into the soil with a plate so that the seeds could completely enter the soil even in this state. The surface of the soil became slashed, and the conditions were very severe for the establishment of field crops. Flooding was maintained for 3 days, after which water on the soil surface was removed. Thereafter, when whitening of the soil due to drying was observed, water was replenished to such an extent that the whitened portion was eliminated about twice a day, and the wet state was maintained. About 3 weeks after sowing, the true leaf extracted individuals were counted, and the ratio and the ratio of the seedlings were used as an average and standard error.

  As shown in Table 14, the seedling establishment ratio was increased by MoPK, but the effect of improving seedling establishment was obtained by adding MgO.

<Test 8b>
As in Test 8a, ammonium sulfate was added to create a flooded soil. Except for the case of no treatment, the case of only 0.2 mol Mo / kg of MoPK, and the point of mixing 0.1 mol / kg of MgCO ₃ , MgO, Mg (OH) ₂ , CaCO ₃ in addition to MoPK, In the same manner as in Test 8a, wheat seeds were coated (PVA was 2% by weight of the mixture), and the seedling establishment ratio in flooded soil was examined.

  As shown in Table 15, the seedling establishment ratio was increased by MoPK, but the seedling establishment was further improved in the coated seeds in which these materials were mixed.

<Test 8c>
In paddy fields in Chikugo City, Fukuoka Prefecture, on October 19, 2011, wheat (variety: Chikugoizumi) and barley (variety: Nishino Chikara) were mechanically sown according to customary wheat cultivation. The seeds used were untreated and mixed with 0.5 mol Mo / kg MoO in addition to 1 mol Zn / kg equivalent ZnO and coated in the same manner as in test 8a (PVA is 1% by weight of the mixture weight). After sowing, the topsoil is crushed, the corrugated plate is driven into the soil, the section is divided, and the section is drained one day after drowning after drowning (denoted as dredging one day) and drained three days after dredging after drowning. Established a ward (indicated as 3 days of flooding). The true leaf extract individuals were counted on November 8 (1st flooded water) and 14th November (3rd flooded water), and the ratio to the seeded seed number was determined as the seedling establishment ratio. Based on a survey of 3 m × 48 locations under each condition, an average and standard error were obtained.

  As shown in Table 16, in the section coated with MoO and ZnO, the seedling establishment ratio was remarkably improved in both wheat and barley.

[Example 9: Effect on soybeans]
As in Test 8a, ammonium sulfate was added to create a flooded soil. The surface of the soil became slashed, and the conditions were very severe for the establishment of field crops. In the case of no treatment and 0.2 mol Mo / kg MoPK alone, in addition to MoPK, 0.1 or 0.2 mol Mg / kg equivalent MgO was mixed and coated with soybean seeds (Fukuyutaka) as in Test 8a. (PVA is 3% of the weight of the mixture). Similarly, the seedling establishment ratio was examined when the seedlings were sowed in flooded soil and the water fell after 3 days.

  As shown in Table 17, the seedling establishment ratio was increased by MoPK, but the effect of improving seedling establishment was further obtained by adding MgO.

[Example 10: pH when molybdenum material and various materials are mixed]
0.2 mol Mo / kg molybdenum material (MoO, MoPNH, MoPK) and 0-10 mol / kg various materials (names are listed under the molybdenum material in Table 10a. Electrofused MgO is heated at high temperature. The obtained fused magnesium oxide (manufactured by Tateho Chemical Co., Ltd., fused magnesia 96)) was mixed, and the coated seeds corresponding to about 2 g of air-dried seeds were placed in 10 ml of water and passed for 1 day. The pH was measured. Moreover, in addition to MoPK, the seed of Test 6d coated with bentonite or talc was also attached to water in the same manner, and the pH of the aqueous solution was measured.

As shown in Tables 18 to 19, the pH of the aqueous solution containing the coated seeds increased even when various materials were mixed with any molybdenum material. The pH when using an equivalent amount of material is difficult to increase in the order of ZnO <CaCO ₃ <MgCO ₃ <Mg (OH) ₂ <MgO <CaO≈Ca (OH) ₂ , and it is difficult to cause damage to the seed due to alkali. it was thought. In addition, electrofused MgO was less likely to have a higher pH than general MgO (heavy). Even if more materials were used, the pH was not raised too much, and it was expected to have a longer effect.

  Table 20 shows the solubility (reference values) for some of the various materials as a reference.

In particular, it is expected that MgO, Mg (OH) ₂ , MgCO ₃ , and CaCO ₃ have low solubility and have a small effect on seeds.

  The present invention can be widely used in the agricultural field where crops are cultivated.

Claims (8)

A first material selected from the group consisting of molybdenum-containing materials and tungsten-containing materials;
A second material that adjusts the supply of the functional component supplied from the first material by the pH adjusting action, and is provided on the surface or inside of the plant propagation material, a plant propagation material ,
The second material is at least one selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium carbonate, calcium carbonate, and zinc oxide,
The plant propagation material is a seed,
The amount of the first material is within a range of 0.01 mol or more and 10 mol or less as molybdenum element or tungsten element with respect to 1 kg of air-dried seed weight.
Plant propagation body.   The plant propagation material according to claim 1, wherein the second material is a slightly soluble material having a dissolution ratio with respect to water at room temperature of 1% or less by weight. The plant propagation material according to claim 1 or 2, wherein the first material is selected from the group consisting of tungsten-containing materials. The first material is metal molybdenum, molybdenum trioxide, molybdic acid and its salt, molybdophosphoric acid and its salt, molybdosilicate and its salt, metal tungsten, tungsten trioxide, tungstic acid and its salt, tungstophosphoric acid and its The plant propagation material as described in any one of Claims 1-3 which is at least 1 type selected from the group which consists of a salt, tungstosilicic acid, and its salt.   The plant propagation material according to any one of claims 1 to 4, wherein the plant propagation material is a grass family or leguminous plant.   The plant propagation body as described in any one of Claims 1-5 with which the seedling establishment of a plant propagation body improves. The cultivation method of a plant propagation body including the planting process of planting the plant propagation body as described in any one of Claims 1-6 . The cultivation method of Claim 7 which has a period when at least one part of a plant body is in a flooded state after the planting process and the seedling establishment period.

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