JP3951057B2 - Granulated coated seed and method for producing the same - Google Patents

Description

  The present invention relates to a granulated coated seed and a method for producing the same.

  With the aging of the agricultural field and the declining number of people, there is a need for technology that can support the efficiency and labor saving of agriculture, and one of them is granulation coating that enables machine sowing and reduces thinning work. Seeds are popular. Until now, granulated materials such as red clay, clay, diatomaceous earth, calcium carbonate, kaolin, talc, etc. on seeds such as vegetables and flower buds, fluidized bed granulator or slant using binders such as polyvinyl alcohol and carboxymethyl cellulose. It is known to perform granulation coating with a rotary bread granulator or the like. The granulated coated seeds obtained in this way are crushed into blocks and germinated when the coating layer absorbs moisture in the soil after sowing, and the coating layer absorbs water and cracks are formed in 2 to 3 places. Occur.

  However, the granulated coated seeds coated with such a granulating material or binder have a germination delay or abnormal germination due to physical or chemical effects, apart from their functionality. May adversely affect germination. Alternatively, depending on the type of seed, depending on the storage conditions, the germination rate may decrease over time and the commercial value may decrease.

  For example, JP-A-3-94604 (Patent Document 1), JP-A-8-56425 (Patent Document 2), JP-A-8-70629 (Patent Document 3), Japanese Laid-Open Patent Application No. 10-155313 (Patent Document 4) and the like disclose the use of a double-chain structure type (or double-chain) clay mineral. Patent Document 1 discloses a technique of granulating and coating with a granulating composition containing 70 to 95 parts by weight of a double-chain structure type clay mineral and 5 to 30 parts by weight of a hydrophobic agent, but lacks moisture. In soil, the cracking of the coating layer during water absorption may be insufficient. In Patent Document 2, in addition to a substance having a fibrous crystal structure with an aspect ratio of 20 or more, coated with a coating material comprising an inorganic substance and a hydrophobic agent, sepiolite is used as a clay mineral having a fibrous crystal structure, and palygorskite as another inorganic substance. In the same manner, however, there are problems that the coating layer is not sufficiently cracked during water absorption, and that double grains are formed by binding two or more grains. In Patent Document 3, palygorskite is used as an example of clay mineral, which is coated with a coating material composed of a clay mineral having a very limited physical property and a water repellent, and has a large specific surface area. % And a water repellent composition, the hardness increases with time, the coating layer cracks during water absorption, double grains occur, and in soil where water is insufficient, In some cases, the coating layer was not sufficiently cracked. Patent Document 4 discloses a system containing a double-chain structure type clay mineral, silica, feldspar, carbonate mineral, hydrophobic agent, etc. Similarly, depending on the blending amount of the double-chain structure type clay mineral, hardness or There were problems such as cracking during water absorption and generation of double grains.

  These double-chain structural (or double-chain) clay minerals are classified according to Clay Handbook (Gihodo Co., Ltd., published on January 15, 1967), pages 41, 48-49, 60-61. Is a clay mineral having a double-chain structure type crystal structure, and from its crystal form, attapulgite is fibrous and woody, and sepiolite is α-type fibrous and tubular, It is described that the β-type is an amorphous flaky crystal form. From the X-ray diffraction data of attapulgite (palygorskite) and sepiolite having these crystal structures, attapulgite (palygorskite) is characterized in the vicinity of d = 10.5 mm, and sepiolite is characterized in the vicinity of d = 12.2 mm. It is known to have a crystal structure showing a diffraction peak (Appendix Table of “Clay Handbook 2nd Edition” (Gihodo Publishing Co., Ltd., issued April 30, 1987), X-ray diffraction data, pages 1308 to 1310). These double-chain structure type (or double-chain) clay minerals are known to contain crystalline minerals such as dolomite, calcite, and silica as impurities, so these diffraction peaks are detected as impurities. Is done.

It is also known that when these double chain structure type (or double chain) clay minerals are used as a granulating material, they can be granulated only with water without using an organic binder such as polyvinyl alcohol or carboxymethyl cellulose as a binder. Thus, it is known that the mineral itself has a high binding force. Therefore, when these double-chain structure type (or double-chain) clay minerals are used as a granulating material, they have the advantage that they can be granulated only with water, but their blending adjustment is difficult. It had the following problems.
Japanese Patent Laid-Open No. 3-94604 JP-A-8-56425 JP-A-8-70629 JP 10-155313 A

  The present invention has been made in view of the above points, granulated coated seeds that can ensure sufficient germination, maintain stable germination over time, and have excellent moldability, And it aims at providing the manufacturing method which can manufacture such a granulation coating seed stably.

  As a result of intensive studies, the present inventors have deliberately destroyed the crystal structure of attapulgite, which is a clay mineral having a double chain structure type crystal structure, and the ignition loss at 650 ° C. is 7% by weight or less. By using the attapulgite thus obtained and a granulating material composition containing 50 to 95% by weight of this, it is possible to ensure sufficient germination by granulating and coating the seeds, and also provide stable germination over time. It has been found that a granulated coated seed that is maintained and has excellent moldability can be stably produced, and the present invention has been completed.

That is, the present invention is state, and are ignition loss of 7% by weight or less at 650 ° C., and 50 to 95 weight attapulgite which does not show a diffraction peak at d = 10.5 ± 0.1 Å in the X-ray diffraction data % granulating and coating seeds, characterized in that in the granulating material composition containing the granulated coating, and state, and are ignition loss of 7% by weight or less at 650 ° C., and, in the X-ray diffraction data d = 10.5 ± 0.1 kg of granulated material composition containing 50 to 95% by weight of attapulgite that does not show a diffraction peak, and relates to a method for producing a granulated coated seed, wherein the seed is granulated and coated Is.

  “Attapulgite” in the present invention includes palygorskite. In other words, depending on the literature, palygorskite may be mentioned instead of attapulgite as a double chain structure type clay mineral, or it may be listed together with attapulgite, but both are structurally the same. The attapulgite referred to in the invention is a concept including what is called a palygorskite.

  According to the present invention, sufficient germination can be ensured not only under normal moisture conditions but also under water-deficient conditions, and stable splitting properties can be secured over time to maintain germination, and further molding A granulated coated seed having excellent properties can be obtained, and the granulated coated seed can be stably produced.

  Hereinafter, matters related to the implementation of the present invention will be described in detail.

<Attapulgite whose ignition loss at 650 ° C. is 7% by weight or less>
As described above, attapulgite is originally a clay mineral having a double-chain structure type crystal structure, and has a crystal structure showing a characteristic diffraction peak in the vicinity of d = 10.5% in X-ray diffraction data. is there. On the other hand, attapulgite used in the present invention, which has a loss on ignition at 650 ° C. of 7% by weight or less, has such a broken crystal structure. In the original attapulgite having the above crystal structure, the loss on ignition at 650 ° C. is usually about 10 to 15% by weight. However, when this attapulgite is fired under predetermined conditions, the crystal water is removed and the original crystal structure is lost. Collapse. The loss on ignition at 650 ° C. of 7% by weight or less means that crystal water is lost and the crystal structure is destroyed by the predetermined baking treatment. In the present invention, such a crystal structure is destroyed. Use attapulgite.

  As described above, when a clay mineral having a double chain structure type crystal structure is used as a granulating material, it is known that it can be granulated only with water without using an organic binder such as polyvinyl alcohol or carboxymethyl cellulose as a binder. However, the effect is retained even if the original crystal structure is destroyed. However, by destroying the original crystal structure, the bonding force can be moderately suppressed, so that even when used at a high content, the hardness does not increase, and the adhesiveness decreases, so double particles do not occur, Furthermore, it has been found that even when soil conditions are low in water content than when it has a crystal structure, it is sufficiently cracked by water absorption, and this is a feature of the present invention.

  Here, the loss on ignition at 650 ° C. is that the weight when the powder is dried at 105 ° C. for 3 hours in advance is W1 (free water volatilizes at this stage), and then the powder is 650 ° C. This is a numerical value obtained by [(W1-W2) / W1] × 100 (%), where W2 is the weight measured after the treatment for 1 hour, and indicates the rate of mass change caused by crystal water other than free water.

  Such an attapulgite having a loss on ignition at 650 ° C. of 7% by weight or less (hereinafter sometimes referred to as a crystal structure collapse attapulgite) is exemplified by a commercially available attapulgite having a double-chain structure type crystal structure. It can be obtained by baking at 300 to 700 ° C. for 10 minutes to 6 hours. With respect to the firing time, the firing time may be lengthened when the firing temperature is low and shortened when the firing temperature is high. In the case of firing at a temperature lower than 300 ° C., the crystallinity is lowered, but the crystal structure is not sufficiently broken, so that the above effect is hardly obtained. In addition, when the firing temperature is as high as close to 1000 ° C., a phase change of the clay structure occurs, which is not preferable. The upper limit of the temperature is sufficient up to 700 ° C., and a temperature exceeding 700 ° C. is unnecessary. The crystal structure collapsed attapulgite used in the present invention is not necessarily limited to those fired under such firing conditions, and can be used in the same manner as long as the loss on ignition at 650 ° C. is 7% by weight or less. is there.

  The loss on ignition of the crystal structure collapsed attapulgite at 650 ° C. is 7% by weight or less, preferably 6% by weight or less. If the loss on ignition at 650 ° C. exceeds 7% by weight, the clay mineral becomes sticky and the hardness of the granulated coated seed produced tends to increase, or double grains with two or more grains bound together tend to occur. In addition to being seen, it becomes easy to make unevenness on the product surface. The lower limit of ignition loss at 650 ° C. is preferably 1% by weight, more preferably 2% by weight. When the loss on ignition at 650 ° C. is less than 1% by weight, the hardness may be slightly lower depending on the type of seed, and the surface of the product may be uneven at the time of molding, and it takes some time to repair the shape. May be required.

  Moreover, the mixture ratio which occupies in the granulated material composition of the said crystal structure collapse type attapulgite is 50 to 95 weight%. When the blending ratio is less than 50% by weight, the hardness is lowered, and thus an organic binder such as polyvinyl alcohol or carboxymethyl cellulose, which may cause an influence on the generation of double grains and growth, is required as a binder. There is. On the other hand, when the blending ratio exceeds 95% by weight, it may be difficult to perform good molding depending on the type of seed.

  The crystal structure collapsed attapulgite has a median diameter of A when dispersed in water and subjected to ultrasonic treatment, and A / B = 0.5 to 1.0, where B is the median diameter before treatment. It is desirable to be in the range. In this ultrasonic treatment, 2 parts by weight of attapulgite and 0.02 part by weight of a dispersant (sodium hexametaphosphate) are added to 100 parts by weight of water, and the mixture is stirred and dispersed for 10 minutes. In the examples described later, the median diameter after treatment with 47 kHz ultrasonic waves for 5 minutes was measured.

  The above A / B is considered to be the cohesive force of the powder. When A / B is less than 0.5, the cohesive force is weak, and the powder is easily broken by the pressure applied during the granulation process. There may be a problem that makes it easier to perform. A / B = 0.5 to 1.0 is excellent for molding, and spherical and elliptical shapes of the molded product are smooth, and it is possible to produce a granulated coated seed that is excellent in appearance. it can. Furthermore, there is a feature that the shape can be easily corrected even when the balance between the granulated material and the binder (including only water) is lost during molding.

  As for the particle size of the crystal structure collapsed attapulgite, it is desirable that the particle size distribution is such that mode diameter ≧ median diameter ≧ 10 μm when it is dispersed in water and subjected to ultrasonic treatment. Granulation is possible even outside this range, but because the particle size distribution is mode diameter ≧ median diameter ≧ 10 μm, the spherical and elliptical shape of the molded product becomes smooth, and it is excellent in appearance. Seeds can be produced. Furthermore, there is a feature that the shape can be easily corrected even when the balance between the granulated material and the binder (including only water) is lost during molding. Furthermore, an appropriate hardness can be obtained because of a particle size distribution suitable for particle filling. Although the upper limit of the mode diameter is not particularly limited, a mode diameter of 80 μm or less is usually used. Note that the ultrasonic treatment here is the same as the case of obtaining the above A / B.

  As used herein, the particle diameter of the particles refers to a volume-based particle diameter measured by a laser diffraction / scattering method, the mode diameter is the most frequent diameter, and the median diameter is 50%.

  The crystal structure collapsed attapulgite preferably has a water absorption of 130 to 200 ml / 100 g, more preferably 140 to 180 ml / 100 g. Here, the amount of water absorption refers to the amount of water absorbed by a certain amount of sample, measured according to 21 (oil absorption) of JIS K5101-1991, and measured using distilled water instead of oil. It is a thing. Specifically, 1 to 5 g of a sample is weighed, kneaded with a spatula while dropping distilled water with a burette, and dripping and kneading are repeated. When the whole becomes a hard putty-like lump, knead one drop at a time. The end point was immediately before softening with one drop. The amount of distilled water dropped in the burette when the end point was reached was read and calculated by the following formula (1).

O = (V / m) × 100 (1)
In the formula, O is the amount of water absorption (ml / 100 g), m is the mass (g) of the sample, and V is the volume (ml) of distilled water dropped.

  When the amount of water absorption is lower than 130 ml / 100 g or higher than 200 ml / 100 g, the shape tends to become distorted or become double-grained due to the increase or decrease in the amount of water added during granulation.

The crystal structure disintegrating attapulgite, in X-ray diffraction data, and does not exhibit a diffraction peak at d = 10.5 ± 0.1Å. As described above, by firing the attapulgite having a double-chain structure type crystal structure, the crystal water is removed and the original crystal structure is destroyed. Depending on the firing conditions, a diffraction peak in the vicinity of d = 10.5 ± 0.1 mm, which is a characteristic of attapulgite, disappears in the X-ray diffraction chart, that is, the crystal structure of attapulgite is completely destroyed. FIG. 1 shows an X-ray diffraction chart before and after the treatment of attapulgite, and Table 1 below shows the X-ray diffraction data. As shown in these figures, in the attapulgite (I) before treatment having a double-chain structure type crystal structure, there was a diffraction peak at d = 1.59, whereas by baking at 600 ° C. for 30 minutes, d = Attapulgite (II) in which the diffraction peak near 10.5 mm completely disappeared was obtained. In the present invention, and more the use of attapulgite diffraction peak around such d = 10.5 ± 0.1 Å has completely disappeared, the physical properties becomes more stable state.

  The above X-ray diffraction data uses a fully automatic X-ray diffractometer (“MXP3” manufactured by Mac Science Co., Ltd.). X-rays are 40 kV and 40 mA using CuKα rays, and conditions for divergence, scattering, and light receiving slits are used. A range of 2θ = 3-70 deg was measured at 1 deg, 1 deg, 0.3 mm, and a scanning speed of 4 deg / min.

  The crystal structure collapsed attapulgite preferably has a pH of 8 to 10, preferably a pH of 9 to 10. When the pH is 8 or more and 10 or less, it can be expected to suppress the growth of molds and bacteria without affecting the germination and growth of the seeds. Can be expected to improve the permeability of In addition, about pH, it is a measured value in the 1 weight% aqueous dispersion state of powder.

<Hydrophobic agent>
As the hydrophobic agent used in the present invention, various types are known, but natural products or fine powders of some processed products thereof are preferable. Examples of such include fine powders such as higher fatty acids and metal salts thereof, higher aliphatic alcohols and waxes. Particularly preferred are higher fatty acid calcium, higher fatty acid magnesium, higher fatty acid barium, and propylene oxide adducts of higher fatty alcohols. As for the particle size of the hydrophobic agent, those having a median diameter of 0.5 to 80 μm are preferable. The hydrophobic agent is preferably blended in an amount of 1 to 30% by weight in the granulated material composition.

<Attapulgite whose ignition loss at 650 ° C exceeds 7% by weight>
The granulated material composition used in the present invention contains 50 to 95% by weight of attapulgite whose ignition loss at 650 ° C. is 7% by weight or less. In addition to the above hydrophobic agent, 650 ° C. 1-30 wt% of attapulgite having a loss on ignition of more than 7 wt% can be contained. An attapulgite having a loss on ignition of more than 7% by weight at 650 ° C. is an attapulgite in which a double-chain structure type crystal structure is retained, and the original attapulgite having the above crystal structure is used as it is, or the attapulgite is used. What baked on the conditions milder than the said baking conditions etc. can be used. These median diameters are usually 0.1 to 80 μm.

  In this case, attapulgite is mixed with each other. As described above, the loss on ignition at 650 ° C. is 7% by weight or less is 50 to 95% by weight, and the loss on ignition at 650 ° C. is 7% by weight. It must be mixed so that the excess exceeds 1 to 30% by weight, and the ignition loss at 650 ° C. must be 7% by weight or less. Preferably, the content of the loss on ignition at 650 ° C. of 7% by weight or less is twice or more than that of the loss on ignition at 650 ° C. exceeding 7% by weight.

<Others>
In addition, the granulating material composition used in the present invention can contain 1 to 30% by weight of an inorganic or organic powder having a median diameter of 0.1 to 80 μm. Examples of inorganic or organic powders having a median diameter of 0.1 to 80 μm include red clay, clay, diatomaceous earth, calcium carbonate, kaolin, talc, silica, pyrophyllite, vermiculite, calcined gypsum, anhydrous gypsum, hemihydrate gypsum, montmorillonite, Examples thereof include inorganic substances such as bentonite, mica, wollastonite, wollastonite, sepiolite, and organic substances such as cellulose powder.

  Further, in the present invention, within the range that does not impair the effects obtained by the above-mentioned granulated material composition, agricultural chemicals such as fungicides and insecticides, plant growth regulators such as germination promoters, and colorants such as pigments and dyes Fertilizer components and the like can be added to the granulated material composition. In addition, before carrying out the granulation coating operation, these components can be applied to the seed in advance, and in this case, the seed can be subjected to a film coating treatment in advance in order to further improve the adhesion.

  In the present invention, the method for granulating and coating using the granulated material composition is not particularly limited, and examples thereof include a fluidized bed granulator, an inclined rotary pan granulator, a centrifugal fluid granulator, and the like. Can be used. In this case, as the binder (wetting agent), it is possible to use only water that does not use an organic binder, and it is preferable to do so.

  Further, the size of the granulated coated seed obtained by the granulated coating cannot be generally described because the weight and size of the original seed are different from each other. However, the size is not particularly limited as long as it can be mechanically sown.

  In addition, the seeds that are the subject of the present invention are not particularly limited, and can be applied to vegetable seeds, flower seeds, greening / feeding seeds and the like generally used in agriculture and horticulture. For example, cucumbers, melons, pumpkins and other cucurbits, eggplants, tomatoes, petunias, etc., peas, green beans, alfalfa, clovers and other legumes, onions, leeks, etc., radish, turnip, cabbage, cabbage, Brassicaceae, such as Hanayasai, Habutton, Stock, Alyssum, etc. Ovalaceae such as Lobelia, Ranunculaceae such as Delphinium, Ganodermaaceae such as Snapdragon, Primula such as Primula, Scarceae such as Begonia, Violet and Pansy and other violets, Eustoma and other gentian, Dent corn, Shiva Cereals and other seeds

  EXAMPLES Hereinafter, specific examples and effects of the invention will be shown by examples and comparative examples, but the present invention is not limited to these examples.

(Examples 1-4, Comparative Examples 1-3)
100 ml of carrot seeds (germination rate 94%) were put into an inclined rotary bread granulator, and the granulated coating seed particle size was 3.3 mm using the granulation material composition and binder shown in Table 2 below. Granulation coating was performed until After granulation, the mixture was dried with an air dryer set at 35 ° C. to obtain a granulated coated seed.

  Details of each granulated material composition in Table 2 are as follows.

Attapulgite (1): Attapulgite with a loss on ignition at 650 ° C. of 5.5 wt% (Attapulgite (2) fired at 400 ° C. × 1 hour, A / B = 0.7, mode diameter = 24 μm The median diameter is 19 μm, the water absorption is 155 ml / 100 g, the pH is 9.5, and d is not 10.5 ± 0.1 mm.

Calcium stearate: hydrophobic agent, median diameter 10 μm.

Attapulgite (2): Attapulgite with a loss on ignition at 650 ° C. of 11.2% by weight, median diameter 8 μm.

Diatomaceous earth: Median diameter 15 μm.

  About the obtained granulated coated seeds of Examples 1 to 4 and Comparative Examples 1 to 3, the appearance, the double grain ratio (%), and the split layer state of the coat layer at the time of water absorption were observed as the product state. Each indicator is as follows. The results are shown in Table 2.

Appearance (5-level evaluation): 5 (good) to 1 (bad).

-Double grain ratio: The ratio (%) of coated seeds containing two or more seeds per 1,000 seeds coated.

・ Split layer state of the coat layer when water is absorbed: Assuming a low moisture environment, 50 seeds (× 4) are seeded per petri dish according to the TP method described in the International Rules for Seed Testing Rules 2003 Then, germination was observed under the condition that the water content was suppressed to 60% by weight of the predetermined water content. The ratio of coated seeds (%) in which the coat layer was split within 1 hour and the seeds inside was visible.

  Moreover, about the granulated coated seeds of Examples 1 to 4 and Comparative Examples 1 to 3, in order to examine the germination growth state, 200 granulated coated seeds were sown in a 200-hole cell-shaped seedling raising tray according to a conventional method, A germination test (temperature condition = 25 ° C.) was carried out to examine the germination rate and the average number of germination days. The evaluation method of germination rate and average germination days is as follows. The germination rate was investigated 6 months and 12 months after the production of the granulated coated seeds, and the change over time was examined.

Germination rate: The germination deadline is 14 days, and the germination germinated on the 14th day after sowing is evaluated and classified according to the ISTA germination evaluation handbook (Handbook for Seedling Evaluation 2003), and normal germination with respect to the total number of seeded seeds The germination rate was determined as a percentage of the number.

-Average germination days: The number of germinations is counted every day from the germination start date, and is obtained by the following formula (2) as an index of the speed of germination after the germination deadline.

In the formula, k is the number of days after sowing on the day of the survey, Gk is the number of germinated seeds on the day of the survey after k days of sowing, and n is the date until the germination cut-off date.

  As is clear from Tables 2 and 3, it is understood that the granulated coated seeds of the examples according to the present invention have a better product state than the comparative examples and good splitting properties at the time of water absorption. Furthermore, the average germination days were shortened, and a stable germination rate was maintained even with changes over time.

(Examples 5-10, Comparative Examples 4-7)
100 ml of lettuce seeds (germination rate 97%) was put into an inclined rotary bread granulator, 80% by weight of attapulgite shown in Table 4 below, 20% by weight of calcium stearate (median diameter 10 μm) as a hydrophobic agent, and water as a binder. Was used for granulation coating until the particle size of the granulated coating seed was 3.6 mm. After granulation, it was dried with a ventilator set at 35 ° C. to obtain a granulated coated seed.

In Table 4, Example 9 was a mixture of two types of attapulgite. The attapulgites of Examples 5 to 8 and 10 are all fired products. Further, the attapulgite with a loss on ignition of 4.9% in Example 5 and Example 9 is the same product, and in the X-ray diffraction data, no diffraction peak is shown at d = 10.5 ± 0.1 mm. . Further, the attapulgite of Comparative Examples 4 to 6 is an unfired attapulgite, and Comparative Example 7 is an attapulgite that is fired at 300 ° C. for 30 minutes but the ignition loss exceeds 7% by weight.

With respect to the granulated coated seeds of Examples 5 to 10 and Comparative Examples 4 to 7, the appearance, the double particle ratio (%), and the split layer state of the coat layer during water absorption were observed as the product state. Each evaluation method was the same as in Example 1 described above. The results are shown in Table 5.

Moreover, about the granulated coated seeds of Examples 5 to 10 and Comparative Examples 4 to 7, in order to examine the germination growth state, 200 granulated coated seeds were sown in a 200-hole cell molded seedling tray according to a conventional method, A germination test was carried out under two conditions of a favorable and insufficient water environment after sowing, and the germination rate and average germination days were examined. The water environment was adjusted by adjusting the amount of water added at the time of seedling culture soil adjustment and the amount of irrigation after sowing, and the water deficiency was adjusted to 50% by weight of the total water content in a suitable state. The temperature condition was 20 ° C. In addition, the evaluation method of the germination rate and the average germination days was the same as in Example 1 described above. The results are shown in Table 6.

  As is apparent from Tables 5 and 6, the granulated coated seeds of Examples 5 to 10 according to the present invention can produce better products than the granulated coated seeds of Comparative Examples 4 to 7, and germinate. The condition was also good, and a good germination rate was exhibited even in an environment where moisture was insufficient.

  INDUSTRIAL APPLICABILITY The present invention is used in the industrial field of granulating and coating plant seeds, and the obtained granulated coated seeds can reduce mechanical sowing and thinning work in the agricultural field, thereby improving agricultural efficiency and labor saving. It can contribute to.

It is an X-ray diffraction chart before and after the baking treatment of attapulgite.

Claims (12)

Ri der ignition loss of 7% by weight or less at 650 ° C., and granulated material containing 50 to 95% by weight of attapulgite which does not exhibit a diffraction peak at d = 10.5 ± 0.1 Å in the X-ray diffraction data A granulated coated seed characterized by being granulated and coated with the composition.   The attapulgite is in the range of A / B = 0.5 to 1.0, where A is the median diameter when ultrasonically dispersed in water and B is the median diameter before treatment. The granulated coated seed according to claim 1.   The granulated coated seed according to claim 1 or 2, wherein the attapulgite has a particle size distribution when dispersed in water and subjected to ultrasonic treatment such that mode diameter ≧ median diameter ≧ 10 μm.   The granulated coated seed according to any one of claims 1 to 3, wherein the attapulgite has a water absorption of 130 to 200 ml / 100 g. The granulated coated seed according to any one of claims 1 to 4 , wherein the granulated material composition contains 1 to 30% by weight of a hydrophobic agent. The granulated coated seed according to any one of claims 1 to 5 , wherein the granulated material composition contains 1 to 30% by weight of attapulgite having a loss on ignition at 650 ° C exceeding 7% by weight. . Ri der ignition loss of 7% by weight or less at 650 ° C., and granulated material containing 50 to 95% by weight of attapulgite which does not exhibit a diffraction peak at d = 10.5 ± 0.1 Å in the X-ray diffraction data A method for producing a granulated coated seed comprising granulating and coating a seed with a composition. The attapulgite is in the range of A / B = 0.5 to 1.0, where A is the median diameter when ultrasonically dispersed in water and B is the median diameter before treatment. The manufacturing method of the granulated coating seed of Claim 7 . 9. The method for producing a granulated coated seed according to claim 7 , wherein the attapulgite has a particle size distribution when dispersed in water and subjected to ultrasonic treatment such that mode diameter ≧ median diameter ≧ 10 μm. The method of producing a granulated coated seed according to any one of claims 7 to 9 , wherein the attapulgite has a water absorption of 130 to 200 ml / 100 g. The said granulated material composition contains 1-30 weight% of hydrophobic agents, The manufacturing method of the granulated coating seed in any one of Claims 7-10 characterized by the above-mentioned. The granulated coated seed according to any one of claims 7 to 11 , wherein the granulated material composition contains 1 to 30% by weight of attapulgite having a loss on ignition at 650 ° C exceeding 7% by weight. Manufacturing method.

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