JP2001245506A - Method of producing solidified body of plural paddy rice seeds and method of directly sowing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective direct sowing and culturing method for achieving the labor saving of paddy rice culture work. SOLUTION: This method of producing the solidified product of plural paddy rice seeds, characterized by putting a substance having a water-retaining ability and plural paddy rice seeds in each of many pot-like small chambers disposed at a constant distance by the use of an ordinary soil-packing and sowing machine so as to wrap the plural paddy rice seeds with the substance having the water-retaining ability, applying a solidifying liquid to the products to form the solidified bodys of the paddy ricer seeds with the substance having the water-retaining ability, and then taking out the formed pot-like solidified bodys from the small chambers of the frame. The method for directly sowing paddy rice on a flooded paddy field, characterized by sowing the solidified bodys on the surface of a puddled and then drained field at suitable distances, and then controlling water to a small depth. When the paddy rice is cultured using the solidified bodys produced by the above-mentioned production method and employing the method for directly sowing the paddy rice on flooded paddy field, the paddy rice can stably germinate and establish even in a paddy field in the cold district without depending on weather, and the lodging of the paddy rice can be reduced due to the good growth of the stocks of the paddy rice. The solidified products of the plural paddy rice seeds can be produced with the ordinary soil-packing and sowing machine at a low cost without needing an expensive oxygen generator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for direct sowing of paddy rice, and more particularly, to a method for preventing seed rice from floating and flowing by entering water after sowing, without relying on bud drying work depending on the weather. To avoid the increase of floating seedlings, octopus seedlings, falling seedlings, etc.
Another object of the present invention is to provide a production method and a direct sowing method of solidified rice double-grained seeds that can obtain stable seedlings at low cost without requiring an expensive oxygen generating agent (calper).

[0002]

2. Description of the Related Art In recent years, agriculture has reached 90% or more, and production of agricultural crops, especially rice cultivation, has been strongly demanded to reduce production costs and establish labor-saving techniques. The direct sowing cultivation method of paddy rice, which has been developed as one of the methods, has been attracting attention in various places as it can be labor-saving and can be produced at low cost compared to the conventional method of mechanical transplanting of seedlings, and is also applicable to large-scale rice cultivation. I have. The need for direct sowing has been further heightened since rice cultivation has been exposed to international competition without exception in the Gut Uruguay Round Agreement.

Conventionally, the direct sowing method of this kind of paddy rice includes three methods: direct sowing in a dry field, which is widespread in a warm region such as Okayama prefecture, direct sowing in a cold region using the heat retaining effect of water, and eclectic direct sowing in which the disadvantages of both are compensated. Various effective varieties, fertilizer cultivation and water management methods, weed and pest control methods have been studied for each of them.

In cold regions such as Akita and Iwate prefectures, it is effective to use the heat retaining effect by flooding in order to prevent seedling failure during the early spring low temperature period. It is thriving. The direct sowing of flooded soil mainly includes surface sowing in flooded water, medium-row sowing in flooded soil, and sowing in flooded soil. In particular, the method of sowing in flooded soil is expected to spread in the future because of its simple application. Furthermore, in the flooded soil spraying method, there are mainly a method of spraying seed paddy coated with an oxygen generating agent on a plowed and plowed field scene with a backpack type power sprayer and a method of spraying with a helicopter from the air, It is expected to spread in the future as a simple method.

[0005] When rice seeds are sown in flooded soil,
Even when the cover soil is very shallow, budding in the soil significantly inhibits sprouting. Therefore, in the conventional direct sowing method of flooding, seeds are sown on the surface of the soil, and after germination, water is dropped temporarily to promote the growth of the shoots and the elongation of the shoots in the soil. However, in this method, germination inhibition due to mud muddy, floating seedling due to incomplete drying of buds, instability of seedling establishment due to increase of octopus foot seedlings and falling seedlings,
The disadvantages are that the culm base is on the surface of the soil, which makes it easy to lay down. After the seed paddy is sown on the surface of the field, the soil is not covered with soil, and when it enters the water, it floats and flows, and is damaged by duck and sparrows. Was hindered.

A method developed as a new direct sowing method for solving such a problem is a flooded medium medium sowing method. At this time, a method of coating rice seeds with an oxygen generating agent has been devised in order to stabilize budding in a soil low in oxygen. A manual and power sowing machine for this direct sowing method is also commercially available, and has been tested nationwide in the late 1975's and has become a popular technique.

[0007] Then, the paddy rice seeds coated with an oxygen generating agent and having an increased own weight are sown on soft soil after shaking by a backpack type power spreader, and buried in the soil by the own weight of the seeds. A method was developed. This sowing method is simple and efficient, and it is widely used in various places. Further, a demonstration test was conducted as a large-scale sowing method using a helicopter.

[0008] In spite of the progress of the establishment of the direct seeding technique, these conventional methods unfortunately have the following bottlenecks. Not yet. For example, in the flooded soil medium-row seeding method, there is a problem that germination is not stable unless the position (seeding depth) of seeds in the soil is strictly controlled, and a direct sowing machine aimed at controlling the seeding depth has been developed. It takes time and has not reached practical precision control.
Because these direct sowing machines are as expensive as current transplanters,
Farmers who have a transplanter cannot easily introduce them.
It is easy to fall down because it is a grain unit, and the bubbles of oxygen generated from the oxygen generator push up the soil around the seed paddy, so the seed paddy is pushed up by the reaction of seed root elongation, and part of the seeding paddy is spread on the flooded surface. Similarly, they become floating seedlings, octopus foot seedlings and falling seedlings, and are eaten by duck and sparrow. For these reasons, medium sowing in flooded soil and dispersing in flooded soil are point spread and are not widely used in large areas.

[0009] Further, in any of the above-mentioned medium sowing in flooded soil and in sowing in flooded soil, it is necessary to coat the seed rice with an oxygen generating agent. Is expensive, and the rotary talay type coating machine used for the coating operation has a drawback that it is extremely difficult for farmers to handle. An automatic coating machine aimed at eliminating this drawback has been on the market since 1999.
It is expensive with ten thousand yen. For this reason, various attempts have been made to obtain stable seedling establishment (precise sowing depth control, sowing on a per-strain basis, etc.).

For example, JP-A-61-1355 discloses a method in which a plurality of seeds and floor soil for one plant are solidified together with an oxygen generating agent.
No. 10 proposes this. This method requires an oxygen generator and a coagulant, and requires special equipment for forming the frame and solidified body. It is not suitable as a material for direct sowing. Also, JP-A-10-28
No. 416 proposes a direct seeding method and a direct seeding machine in which a solidified material of seed rice and soil for one strain is formed without using an oxygen generating agent, and the solidified material is seeded in a field scene. Also in this method, since a special device is required for the frame and solidified body formation and direct sowing, a new investment is required for ordinary farmers,
It is not suitable as a direct sowing material for cost reduction.

An object of the present invention is to eliminate the above-mentioned bottlenecks and drawbacks. In a cold paddy field, stable germination and seedling establishment can be obtained without being affected by the weather, and lodging can be reduced by growing in the form of a plant. However, there is no need to use an expensive oxygen generating agent, and since it can be produced with a usual soil filling and sowing machine, it is an object of the present invention to provide a low-cost method for direct sowing of paddy rice.

[0012]

SUMMARY OF THE INVENTION The present inventors have found that stable germination and establishment of seedlings can be obtained without being affected by the weather even in a paddy field in a cold region, and that lodging can be reduced by growing in a state of a plant,
It is not necessary to use expensive oxygen generators, and it can be produced with a normal soil-seeding machine. A substance having a water retention capacity and a plurality of rice seeds of one strain are put into each of the chambers of a frame having a plurality of small chambers arranged at regular intervals. After wrapping the seeds, the solidified liquid was irrigated with the seeds to form a solid having a water-retaining property and a plurality of rice seeds in the small chamber, and then a pot-shaped solid was formed from each small chamber of the frame. The present inventors have found out that a direct sowing method that satisfies the above conditions can be obtained by taking out, solidifying the solidified body at appropriate intervals in a field where the water has fallen after falling, and managing the shallow water.

[0013]

Means for Solving the Problems The production method and the direct sowing method of the solidified rice double grain seed according to the present invention have the following means. A. It is characterized in that a pot-like solidified body is formed by wrapping a plurality of rice seeds of one strain with a substance having a water retention ability. B. It is characterized in that the substance having a water retaining ability is mountain soil. C. A substance having a water-retaining capacity and a plurality of rice seeds of one strain are put into each of the chambers of the frame in which a large number of pot-shaped small chambers are arranged at regular intervals. And a solidified liquid is applied to the solidified body to form solidified multiple-grain rice seeds with a substance having a water retaining ability in the small chamber, and then a pot-shaped solidified body is taken out from each small chamber of the frame. It is characterized by: D. A substance having a water-retaining capacity and a plurality of rice seeds of one strain are put in the small chambers, and a plurality of the rice seeds are wrapped with the substance having a water-retaining ability. It is characterized in that a substance having a water-retaining ability enters into the gaps. E. FIG. The method is characterized in that solidified double-grained rice seeds are sown at appropriate intervals in a dropped water field scene after shaking, and thereafter, shallow water management is performed.

[0014]

Embodiments of the present invention will be described below in detail. For the production of solidified rice seeds of the present invention,
An ordinary soil filling and seeding machine, a frame body in which a large number of pot-shaped small chambers are arranged at regular intervals, a substance having a water retaining ability, and the like are used. A substance having water retention ability and a plurality of rice seeds of one strain are put into each of the small chambers of the frame formed by arranging a large number of pot-shaped small chambers at regular intervals with a usual soil filling seeder, After wrapping a plurality of paddy rice seeds with a substance having water retention ability, a solidified liquid is irrigated with this to form a solidified substance of the water retaining ability and a plurality of paddy rice seeds, and then from each chamber of the frame, The pot-shaped solidified product is taken out to produce a solidified double-grained rice seed product. Then, a direct sowing method of sowing the solidified body at appropriate intervals in a field scene is performed.

[0015] The solidified product produced by the production method of the present invention, and the solidified product is sowed at appropriate intervals in a field where water has fallen after shaving, and
If cultivated by a direct sowing method that manages shallow water, stable germination and seedling establishment can be obtained without being influenced by the weather even in a paddy field in a cold region, and lodging can be reduced by the growth of a stock. Further, it can be manufactured with a usual soil filling and seeding machine and does not require an expensive oxygen generator, so that the cost is low.

As the frame having a large number of pot-shaped small chambers indispensable to the present invention arranged at regular intervals, a normal paper pot or a connection pot such as a cell tray can be used. If the number is small, the number of trays required per 10a increases, which leads to an increase in cost. From this, frame 1
The number of holes per sheet is preferably 800 or more, but is not limited to this range. The material of the frame is preferably a material from which the solidified body is easily removed, and plastic is more preferable than paper.

As a substance having a water retaining ability, mountain soil for raising rice seedlings is the best. Normally, mountain soil for paddy rice seedlings is pH adjusted,
The sifted product is inexpensive at about 20,000 yen for one truck, which is equivalent to about 1500 800-hole cell trays. Other substances having a water-retaining ability include soils other than mountain soil, commercially available soil, wood chips, pulp meal, water moss, peat moss, natural organic substances such as palm husks, natural inorganic substances such as zeolites, and foamed resins. The above-mentioned mountain soil is the most preferable substance because it is supplied stably at low cost. In addition, since the solidified body of the present invention is supposed to be scattered in a field where water has fallen after shaving, if the specific gravity of the solidified body is low, the solidified body floats and flows when water is introduced after sowing. For this reason, the specific gravity of the substance having a water retaining ability used for the solidified body is preferably as high as possible, and more specifically, the specific gravity after drying at 105 ° C. overnight is preferably 0.9 g / mL or more. In addition, in the operation of filling the frame with a substance having a water retaining ability, since the volume per 1 hole is extremely small, if the particle size of the substance having the water retaining ability is large, it does not uniformly enter each hole. For this reason, the particle size of the substance having a water retaining ability is desirably 3.35 mm or less, but is not limited to this range.

As the solidifying solution, known ones such as an aqueous solution of alginate, an aqueous solution of gum arabic, an aqueous solution of polyvinyl alcohol, and an aqueous solution of polyacrylate can be used. Aqueous solution is best. More specifically, the alginates include, for example, alkali metal salts such as Na and K of alginic acid and ammonium salts. The concentration of the aqueous alginate solution used is usually 0.05-l. It is about 0% by weight, and the viscosity coefficient is about 10-20 cps.

Calcium (for example, Ca) which reacts with alginate in a substance having a water retaining ability and coagulates it.
It goes without saying that (） H) ₂ ) may be contained as a component. There are two methods of applying the solidified liquid, i.e., irrigation from above and immersion in the solution. It is more convenient to irrigate from above using a power sprayer.

The substance having a water retaining ability of the present invention is coated with a fertilizer or a granular fertilizer in which the elution of fertilizer components is chemically suppressed within a range that does not hinder the effect of the invention, and the elution amount is physically controlled. One or more fertilizers selected from fertilizers can be used.

The fertilizer in which the elution of the fertilizer component is chemically suppressed is a nitrogen fertilizer slowed down by chemical synthesis. For example, isobutyraldehyde-condensed urea (IBD)
U), acetaldehyde condensed urea (CDU or OM)
U), formaldehyde-treated urea, guanylurea sulfate,
Oxamide and the like.

Examples of the coated granular fertilizer include commercially available long (manufactured by Asahi Kasei Corporation), LP coat (manufactured by Chisso), sera coat (manufactured by Central Glass Co., Ltd.),
Mcoat (manufactured by Mitsubishi Chemical Corporation) and the like.

Further, the substance having a water retaining ability of the present invention includes:
A fast-acting fertilizer can be added as long as the effects of the present invention are not hindered. A wide range of ingredients are used,
It contains at least one of N (Chisso), P ₂ O ₅ (phosphoric acid), and K ₂ O (Kari). Further, in addition to these, compounds such as trace elements and agricultural chemicals such as Tachigareace (trade name) may be contained.

The solidified body of the present invention can be produced by setting a frame in a seedling raising box using a usual soil filling and seeding machine.

Further, since the solidified product of the present invention is manufactured through a process of soil filling → seeding → covering soil → solidification liquid irrigation → air drying → removal, the completed solidified product is a substance having water retention ability / rice seed / water retention ability. Is a three-layer structure of a substance having For this reason, the solidified body is easily broken from the central seed portion. However, a substance having a water retention capacity and a plurality of rice seeds of one strain are put into each hole of the frame body, and after wrapping a plurality of rice seeds with the substance having a water retention capacity, a shock is given to the frame body, The strength of the solidified body can be increased by injecting a substance having a water retention ability into the gap between the plurality of central grain rice seeds.

In the ordinary method of sowing in flooded soil (middle row sowing in flooded soil, dispersing in flooded soil), rice seeds are coated with an oxygen generating agent in order to stabilize emergence in soils with low oxygen. Even if such seeds are so deeply sown, seedlings become unstable, so it is necessary to sow seeds in a very shallow part. In addition, when the oxygen generating agent is decomposed to generate oxygen, the seed rice is likely to float on the soil surface together with the oxygen, and the seed rice is easily pushed up to the soil surface due to the reaction of seed root elongation. Some of them become floating seedlings, octopus seedlings, and falling seedlings as in the case of sowing on the soil surface. For this reason, it is common to use a so-called bud drying method in which seedlings are immersed in the flooded soil to promote the growth of shoots and the elongation of radicles in the soil, even though the method is sowing in flooded soil. However, if the rain continues during this time, the bud drying will not be successful, and the number of floating seedlings, octopus foot seedlings and falling seedlings will increase, resulting in poor seedling establishment.

On the other hand, in the solidified product of the present invention, the rice seed is already embedded in a substance having a water retaining ability, and the solidified product retains its shape in water for about 10 days or more. For this reason, the rice seed roots in a substance having water retention ability, and the roots grow smoothly in the field,
Floating seedlings, octopus foot seedlings and falling seedlings do not increase even without drying. For this reason, even if it continues raining, floating seedlings, octopus foot seedlings, and falling seedlings do not increase.

The solidified product of the present invention is 10
Since the shape has been substantially maintained for more than days, seedlings are formed in a stump along the shape of the solidified body. It is known that the lodging resistance of spot-seeded (strain-like) rice is higher than that of spraying or row sowing (Terashima et al., “Article of the Crop Science Society of Japan” 65 (Attachment 2)
1996, P19-20), and the solidified product of the present invention can provide a rice strain having high lodging resistance. Although the solidified body of the present invention can reach seedling establishment by shallow water management, it is a matter of course that the solidified body may be dried during budding such as when good weather continues.

Since the solidified body of the present invention has a volume of about 2 mL when a frame body having 800 holes is used, it does not sink deeply into the soil even when sprayed on a field scene and is completely buried in the soil. It is about. Also, being completely buried in the soil indicates that the seed paddy is firmly in the soil, which also contributes to the formation of a highly lodging-resistant rice plant.

The paddy rice seed used in the solidified body of the present invention has a growing stage of soaking paddy and germinating paddy compared to dry paddy, so that the seedlings are quickly established, and there is a period in which the rice plants are subjected to low temperatures and other harms which hinder the establishment of seedlings. The seedling establishment rate is high because it is short. Soaking seeds and sprouting paddy are better than dry paddy, but if the growth is too advanced, buds may be missing when seeded on a seeding machine, or buds may appear during air drying and solidify. Since the strength of the body is reduced, the best one should be selected according to the situation at that time.

Hereinafter, the present invention will be described with reference to Examples, but the present invention should not be limited by these Examples.

[0032]

Example 1 (Manufacture of the solidified product of the present invention) As a substance having a water retention ability, mountain soil for raising rice seedlings having a particle size of 3.35 mm or less was prepared. Next, an 800-well cell tray (manufactured by Landmark, USA) was placed in the nursery box.
Then, using a soil stuffing machine SUZUTEC ST-30K, the above mountain soil was stuffed to such an extent that the hole at the bottom of the tray was hidden.
Then, using a sowing machine SUZUTEC HS318KB, rice paddy was sown in each hole of the tray so as to be about 5 grains / hole. The rice cultivar used was “Akitakomachi” which was collected and refrigerated at our test site. Thereafter, soil was covered with the mountain soil in the same manner as above. Next, the tray was lifted several centimeters with both hands together with the nursery box, immediately released and dropped horizontally on the floor. This operation was performed several times, and thereafter, the power sprayer Xenoa N
The solidified solution was irrigated from above using S5B. Irrigation was performed several times enough in the tray. After air drying for 4 days, a plastic plate was placed on the upper part of the tray, and the solidified body was turned upside down in a state where the solidified body was packed in a hole, and then the tray was slightly lifted to take out the solidified body. The specific gravity of this mountain soil after drying at 105 ° C overnight is 0.92 g / mL.
Met. In addition, this tray was made of plastic and the solidified material was easy to come off.

[0033]

Example 2 A substance having a water retention capacity with a particle size of 3.35
A mountain soil for raising rice seedlings having a size of not more than mm was prepared. Next, an 800-well cell tray (landmark, USA)
(Produced by the company) in a nursery box. Then, the mountain soil was packed so that the bottom of each hole of the tray was hidden. Thereafter, 5 rice paddies were sown in each hole and covered with the above-mentioned mountain soil. Next, the tray was lifted several centimeters together with the nursery box, instantly released, and dropped horizontally on the floor. This operation was performed several times, and then the solidified solution was irrigated from above. Irrigation was performed several times as much as the tray volume. After air drying for 4 days, a plastic plate was placed on the upper part of the tray, and the solidified body was turned upside down in a state where the solidified body was packed in a hole, and then the tray was slightly lifted to take out the solidified body.

[0034]

Example 3 A particle having a particle size of 3.35 was used as a substance having a water retaining ability.
1% by weight slaked lime in mountain soil for paddy rice nursery
A solid was obtained in accordance with Example 2, except that the mixture was used so as to be uniformly mixed.

[0035]

Example 4 A particle having a particle diameter of 3.35 was used as a substance having a water retaining ability.
The solidified product was prepared according to Example 2 except that 15% by weight of LPS-40 (manufactured by Chisso Asahi Fertilizer Co., Ltd.) was uniformly mixed in mountain soil for paddy rice raising seedlings of not more than mm. I got The amount of N is 23,000 solidified (rice plant) / l
It is assumed that the rooting fertilizer is 2 kg / 10a as 0a.

[0036]

Example 5 A substance having a water retention capacity and a particle size of 3.35 was used.
mm, a rapid-acting fertilizer N,
P205, K2O so that each becomes 0.28g / kg,
Tachigara Ace (manufactured by Sankyo Co., Ltd.)
A solid was obtained in accordance with Example 2 except that it was used in a proportion of L / kg and left to air-dry for several days.

[0037]

Comparative Example 1 Oxygen generator (calpa) 7 in 500 g of dry rice
The coating was performed by a conventional method while gradually adding 50 g (dry paddy: Calper = 1: 1.5).

Comparative Example 2 A particle having a particle size of 3.35 as a substance having a water retaining ability.
1% by weight of slaked lime in vermiculite adjusted to less than 1 mm
A solid was obtained in accordance with Example 2 except that the mixture was used so as to be uniformly mixed. 1 of this vermiculite
The specific gravity after drying at 05 ° C overnight was 0.2 lg / mL.

Comparative Example 3 A solidified body was obtained according to Example 2, except that no impact was applied after soil filling, seeding, and soil covering. (Floating test) Ten solidified bodies of Example 2 and Comparative Example 2 were
Drop into a 1 L beaker filled with water.

[0038]

[Table 1] As is clear from the results in Table 1, all the solidified bodies of the present invention sank in water. On the other hand, none of Comparative Example 2 made of vermiculite sank. This indicates that the solidified body floats and flows when water is introduced after sowing.

(Strength Test) Ten solidified products of Example 2 and Comparative Example 3 were used for l. The seedlings were dropped naturally from a height of 15 m toward the center of the nursery box. At this time, the solidified body is turned sideways,
The hands were released instantly and allowed to fall.

[0040]

[Table 2] As is clear from the results in Table 2, the solidified body of the present invention had high strength, and further, impact on the frame contributed to the strength.

(Field test) Solidified product of Example 1, Comparative Example 1
After the paddy field of 150 m ² was shaved, the seeds were divided into two pieces by Aron ridge plate, and after a few days, the seeds were sprayed in the area where the water was dropped. The solidified body was sprayed by hand, and the calper-coated seeds were sprayed by a power sprayer Maruyama MD-J60 (the seed density was the same in both sections). Further, an average lm ² of the solidified body section and one section of Kalpa was separated by Aron ridge plate and covered with a net to form a survey section. The number of solidified solids in the survey area was 58
There were pieces. In addition, the solidified body zone receives water → flood (shallow water) management,
In the Calpar section, general water management of incoming calder-covered seeds was performed. The test was completed in 15 days (until seedlings were established). The rain was heavy during the test, and the rain was particularly concentrated during the bud drying in the second half of the Kalpá section. In addition, both the solidified body and the calpar-coated seed were sown so that they could be completely buried in the soil.

[0042]

[Table 3]

[0043]

[Table 4]

As is clear from the results shown in Table 3, in Example 1, 131 seedlings were established per 1 m ² . Each rice body was formed in a line along the shape of the original solidified body. Further, the number of strains in the solidified body section was 58, and the establishment rate was 100%. On the other hand, in Comparative Example 1, although the number of seedlings was 189, the weather at the time of sprouting was bad, so the sprouting did not work well, and about 60% of the seeds fell or became octopus-shaped.
Only the book was standing normally. Of course, the seedlings stood in single units. It can be said that the solidified body section is hard to lay down because the seedlings are in a stock form and the solidified body is completely buried in the soil.

Further, in Example 1 (solidified body section), the seeds grew slightly during the air-drying, so that the subsequent growth was early and the seeds grew two days after spraying. As a result, the seedlings in the solidified body grow quickly,
As shown in Table 4, the plant height, leaf age, and degree of fulfillment exceeded Comparative Example 1 (Calper plot). The quality is a measure of the stubbornness of the seedlings. It is said that the larger this value is, the quicker the seedlings survive in healthy seedlings and the more vigorous the initial growth. 7-l. 3.

(Seedling establishment test) The solids of Examples 1, 2, 4, and 5 and the calpar-coated seeds of Comparative Example 1 were packed with 11 g of air-dried soil (3 cm depth) in a 8 cm diameter and 5 cm height bag. After watering, the seeds were allowed to stand for several days, and after dropping the water, the seeds were sowed on the soil surface at a ratio of 4 solids / bat or 20 calper-coated seeds / bat and a biophoto chamber (TAITEC) LX-3000). The biophoto chamber was controlled so that the temperature was 20 ° C., the light state was 12 hours, and the dark state was 12 hours.
The test was carried out until the second leaf was opened and it was almost certain that the seedlings were standing. In this test, the roots firmly penetrated into the soil, and those standing up from the soil were determined to be seedlings. The test was performed in triplicate.

In Examples 1, 4, and 5, only the surface seeding was provided, and in Example 2 and Comparative Example 1, a hand-filled area was provided by hand and pressed by hand until completely buried in the soil. Water management was always shallow water of about 2 cm, and in the hand-filled area of Comparative Example 1, treatment of bud drying for 3 days and bud drying for 2 weeks was provided in addition to the always shallow water management. The shallow water management zone in Comparative Example 1 corresponds to a case where the weather was bad and no buds could be dried at all. The bud-dried section in Comparative Example 1 means that when the pods emerge from the seeds and the first leaves are about to be extracted, that is, when the roots are about to grow into the soil, water is dropped, Is a ward that manages water to run water when it is dry. This bud drying is ideal if it can be performed for a long period of time, but in practice it often ends in a few days due to various reasons such as the weather.

[0048]

[Table 5]

[0049]

[Table 6]

As is clear from the results shown in Table 5, the seedling standing was good in all of the Examples. Each rice body was formed in a line along the shape of the original solidified body. On the other hand, the surface seeding of Comparative Example 1 corresponds to the case where the weather was bad and the sprouts could not be dried at all, so that all the seedlings became floating seedlings, octopus foot seedlings and falling seedlings, and stood from the soil. There was no.
In an actual field, since the calpar-coated seeds are sprayed by a power spreader, the calper-coated seeds sink to the extent that they completely fit in the soil. In the hand-filled area of Comparative Example 1 assuming that case, the seedling establishment rate was about 40%, which was lower than the average value of all of the present examples. On the other hand, in the hand-filled section of Example 2, the seedling establishment rate was as high as about 80%, and was statistically higher than the surface sowing and the hand-filled section of Comparative Example 1. In addition, all of the plots of the present example were established in stock units, and the plots of the comparative example were established in single units.

The solidified product of the present invention is equal to or more than the calpar-coated seeds in the condition considered to be the best in weather (hand-buried bud drying for 2 weeks in Comparative Example 1, practically 3 days). Seedlings and bad weather (Comparative Example 1)
(Seeding on the surface, hand-filled area) has higher ability to stand seedlings than Calpar-covered seeds, and to stand in the form of a stump. It was confirmed that it could be obtained.

In this case, too, the seedlings in the solidified body section grew quickly, and the plant height, leaf age, and degree of fulfillment exceeded the surface seeded and hand-filled sections of Comparative Example 1 as shown in Table 6.

[0053]

According to the present invention, if the solidified product produced by the method for producing solidified double-grained rice seed of the present invention and the direct sowing method using the same are cultivated, even in cold paddy rice fields, it is not affected by the weather. Stable germination and establishment of seedlings can be obtained, and lodging can be reduced by the growth of a strain. Further, it can be manufactured with a usual soil filling and seeding machine and does not require an expensive oxygen generator, so that the cost is low.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiyuki Sato 15-2 Shinyashiki, Takaseki Kamigo, Omagari-shi, Akita F-term (reference) 2B051 AA02 AB01 BA02 BA04 BA16 BB04 BB14 2B054 AA17 BA01 BB02

Claims (5)

[Claims] 1. A method for producing a solidified double-grained rice seed, comprising forming a pot-like solid by wrapping a plurality of rice seeds of one strain with a substance having a water retention ability. 2. The method according to claim 1, wherein the substance having a water retaining ability is mountain soil. 3. A substance having a water-retaining ability and a plurality of rice seeds of one strain are put into each of the chambers of a frame in which a large number of pot-like small chambers are arranged at regular intervals. A plurality of paddy rice seeds are wrapped, and a solidified liquid is applied thereto to form a solidified plurality of paddy rice seeds with a substance having a water retaining ability in the small chamber. 3. The method for producing a solidified double-grained rice seed according to claim 1 or 2, wherein the solidified body is taken out. 4. A substance having a water retention capacity and a plurality of rice seeds of one strain are put in each of the small chambers, and after wrapping the plurality of rice seeds with the substance having a water retention capacity, an impact is given to the frame. The method for producing a solidified double-grained rice seed according to any one of claims 1 to 3, wherein a substance having a water-retaining ability is introduced into gaps between the multiple-grain rice seeds. 5. A method for direct sowing of solidified double-grained rice seeds, comprising: sowing the solidified double-grained rice seeds at appropriate intervals in a dropped field after shaving, and then performing shallow water management.