CN103718701A - Seed coating formula and pelleting method for direct seeding of rice and application thereof - Google Patents

Abstract

The invention discloses a seed coating formula for direct seeding of rice, a pelletizing method and application. The coating formulation contains a filler and a binder; the pelletization method specifically includes the following steps: preparation of a binder, preparation of a filler, primary granulation, secondary granulation, tertiary granulation, drying and the like. The invention uses water as the binder in the primary granulation to ensure that the seed coat can be quickly cracked when it meets water; the pelletization method is layer-by-layer granulation to ensure the single-seed rate and seed-bearing rate after pelletization. Compared with film coating, seed soaking, etc., the present invention completely changes the original form of seeds, and simplifies the machines for direct seeding of rice. Different from domestic dissolving pelletized seeds, the cracking form of the pelletized seed coat is cracking, and the added active ingredients are not easy to lose and can fully exert their effects. The method adopts the above-mentioned seed coating formula, has the advantages of simple production process, makes rice seeds regular in shape, large in size and weight, and is convenient for realizing precise direct seeding of rice.

Description

A kind of seed coating formulation and pelletizing method and application for direct seeding of rice

technical field

The invention belongs to the technical field of rice planting, and in particular relates to a seed coating formula for direct seeding of rice, a pelletizing method and its application.

Background technique

Rice direct seeding technology is popular among farmers for its advantages of reducing labor intensity and saving production costs. According to incomplete statistics, the area of direct-directed rice in my country has exceeded 2 million mu. According to the law of the development of foreign rice cultivation technology with industrialization and marketization, with the improvement of the scale of rice production in my country and the change of rural labor force structure, direct seeding technology is one of the important directions of rice cultivation in my country in the future.

The current direct-seeding technology of rice mostly uses rice seeds that have been soaked with seed soaking agents or film-coated with coating agents. Aiming at the problem of artificially spreading rice seedlings, Zhou Benxin et al. (patent application number: 200810024466.X) and Zhang Hongxi et al. (patent application number: 93115727.X) developed a special seed coating agent for direct-seeding rice, and Li Guoxi et al. (patent application number: 200910042200.2) developed a cold-resistant soaking agent for direct-seeding rice. agent. The above-mentioned coating agent and seed soaking agent have good effects in preventing and controlling bird damage, rodent damage, improving seedling quality and improving low temperature resistance of rice seedlings and the like. However, under the treatment method that does not change the shape of rice seeds, the seeding rate of the current direct seeding machine is generally more than 3 to 5 seeds per hole, and the amount of seeds used is relatively large.

Seed coating pelletization technology is an agricultural high-tech that meets the needs of precision sowing. There have been many domestic patents related to seed pelletization coating technology, among which Feng Jinxiang (patent application number: 200510089266.9) disclosed the Small seed pelletization process; Li Ming et al. (patent application numbers: 200710037244.7 and 200710037243.2) studied a method of pelletizing and coating cruciferous vegetable seeds with botanical pesticides and a pelletizing formula and processing of flower particle seeds Methods; Xu Maolin (patent application number: 200710147370.8) studied the new type of medicinal fertilizer matrix and pelletization technology for pasture seed pellet coating. The above-mentioned granulation technology is all for the seeds with small particles and regular shapes. Huang Guiqin et al. (Patent Publication No.: CN 1309882A) have studied the granulation processing technology of corn seeds, so that the large particles of corn seeds outside the young corn need to grow. Substance, and seed shape, size are basically the same. Rice seeds are elongated with a length-to-width ratio close to 4:1, and the outer shell is fluffy, which is very different in shape from corn and other small-grained seeds. So far, there is no pelleting formula and processing method for direct-seeding rice. .

Contents of the invention

In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a seed coating formula for direct seeding of rice. This formula can be wrapped on the surface of rice seeds, and it will decompose quickly when exposed to water.

Another object of the present invention is to provide a seed pelleting method for direct seeding of rice. The method specifically includes the following steps: preparation of binder, preparation of filler, primary granulation, secondary granulation, tertiary granulation, drying and the like. The method adopts the above-mentioned formula, has the advantages of simple production process, regular shape of rice seeds, increased size and weight, and is convenient for realizing precise direct seeding of rice.

Another object of the present invention is to provide the application of the seed coating formula and pelleting method for direct direct seeding of rice in mechanized direct direct seeding of rice.

The object of the present invention is achieved through the following technical solutions:

A seed coating formulation for direct direct seeding of rice, containing fillers and binders;

Described filler preferably comprises neutral bentonite and talcum powder;

The mass ratio of the neutral bentonite to talcum powder is preferably 1: (4-5);

The fineness of described neutral bentonite is preferably 500 mesh; The fineness of described talcum powder is preferably 800 mesh; The fineness of described neutral bentonite and talcum powder are different;

The binder is preferably an aqueous solution obtained by mixing soluble resin and water at a mass ratio of 1:(5-6);

Described soluble resin is preferably gum arabic;

Utilize the seed pelletizing method that the above-mentioned seed coating formula for direct seeding of rice realizes, comprises the steps:

(1) Preparation of binder: mix soluble resin with water, soak, and stir to completely dissolve soluble resin in water to obtain binder;

(2) Preparation of filler: mix neutral bentonite and talcum powder, stir evenly to obtain filler;

(3) Initial granulation: Pour rice seeds into the seed pelletizing machine, spray water and add filler at the same time, perform the above operation every 40-50 seconds; after 4-6 minutes, every 55-65 seconds Repeat the operation once; after 7 to 9 minutes, the preliminarily granulated seeds are sent into a separation sieve with a hole diameter of 6 mm, and the filler and single granulated seeds continue to fall into the separation sieve with a hole diameter of 4 mm, and the remaining The seeds on the separation sieve with a hole diameter of 4mm are primary granulated seeds; the seeds that pass through the separation sieve with a hole diameter of 4mm continue to be granulated for the first time, and are separated with a separation sieve with a hole diameter of 4mm every 4 to 5 minutes The first-level granulated seeds are produced until less than 1% of the seeds pass through a separation sieve with a hole diameter of 4mm;

(4) Secondary granulation: Pour the primary granulated seeds obtained in step (3) into the seed pelletizing machine, spray the binder and add the filler at the same time, and perform the above operation every 90 to 120 seconds After 3 to 6 minutes, the seeds are sent into the separation sieve with a hole diameter of 6mm, and the seeds that remain on the separation sieve with a hole diameter of 6mm are called secondary granulated seeds; The seeds on the separation sieve with a hole diameter of 4mm continue to be granulated for the second time, and the secondary granulated seeds are separated with a separation sieve with a hole diameter of 6mm every 3 to 6 minutes until less than 0.5% of the seeds pass through the hole diameter 6mm separating sieve;

(5) Three-time granulation: Pour the secondary granulated seeds obtained in step (4) into the seed pelletizing machine, spray the binder while adding the filler, and perform the above operation every 90-120 seconds; After 10 to 14 minutes, the seeds are sent into the separation sieve with a hole diameter of 10mm, and the seeds left on the separation sieve with a hole diameter of 10mm are called three-stage granulated seeds, and the seeds that pass through the separation sieve with a hole diameter of 10mm are continued. Carry out three times of granulation, every 6 to 7 minutes use a separation sieve with a hole diameter of 10mm to separate the three-stage granulated seeds, until less than 0.05% of the seeds pass through the separation sieve with a hole diameter of 10mm; Grade pelleted seeds;

(6) After 12 to 15 minutes, pour all the three granulated seeds into the seed pelletizing machine, spray the binder and add the filler at the same time, repeat every 120 to 150 seconds; after 6 to 8 minutes, the pelleted rice seeds;

(7) Dry the pelleted rice seeds and store in sealed packages.

The rice seeds include the seeds of all rice varieties; preferably the seeds of Y Liangyou No. 1, Yuxiang Youzhan or Xiushui 134, etc.;

The mixing conditions described in step (1) are preferably mixed with soluble resin and water at a mass ratio of 1: (5-6) at a temperature above 15°C;

Described soluble resin is preferably gum arabic;

The soaking time described in step (1) is preferably soaking for more than 7 hours;

The rotational speed of the described seed pelletizing machine is preferably 35-70r/min;

The mixing of neutral bentonite and talcum powder described in step (2) is preferably mixing neutral bentonite and talc powder in a mass ratio of 1: (4-5);

The fineness of the neutral bentonite described in step (2) is preferably 500 mesh; the fineness of the talcum powder is preferably 800 mesh; the fineness of the neutral bentonite and talc powder are different;

The amount of sprayed water described in step (3) is preferably 8-10% of the mass of rice seeds;

The amount of filler added in step (3) is preferably 1 to 1.5 times the mass of rice seeds;

The amount of water sprayed after 4 to 6 minutes in step (3) is preferably 15 to 17% of the mass of rice seeds, and the amount of filler added is preferably 2 to 2.5 times the mass of rice seeds;

After sending the preliminarily granulated seeds into the separation sieve with a hole diameter of 6mm as described in step (3), separate the filler, the single granulated seeds and the granulated clusters with multiple seeds stuck together;

After the filler described in step (3) and the seeds with successful single-granulation granulation continue to fall into the separation sieve with a hole diameter of 4 mm, the fillers are self-granulated and the seeds with poor granulation effect are mixed with the single-granule Separation of seeds that were pelleted and successfully increased in size;

The amount of the binder sprayed in step (4) is preferably 0.6 to 0.7 times the mass of rice seeds;

The amount of filler added in step (4) is preferably 8 to 9 times the mass of rice seeds;

The amount of the binder sprayed in step (5) is preferably 0.8 to 0.9 times the mass of rice seeds;

The amount of filler added in step (5) is preferably 8 to 9 times the mass of rice seeds;

When the granulation is continued three times in the step (5), the amount of the sprayed binder is preferably 0.4 to 0.6 times the mass of the rice seeds, and the amount of the filler added is preferably 4 to 6 times the mass of the rice seeds; Repeat the above operation once for 90-120 seconds;

The amount of the binder sprayed in step (6) is preferably 1 to 2 times the mass of rice seeds;

The amount of filler added in step (6) is preferably 8 to 9 times the mass of rice seeds;

The pelleted rice seeds described in step (6) have one and only one rice seed per pelleted rice seed;

The drying conditions described in step (7) are preferably constant temperature drying at 30-35°C for 24-30 hours;

The application of the seed coating formula for direct seeding of rice in mechanized precision direct seeding of rice.

The application of the seed pelleting method realized by using the above-mentioned seed coating formula for direct seeding of rice in the mechanized precision direct seeding of rice.

The mechanized precision direct seeding of rice is to sow 1 pelleted rice seed per hole;

The pelleted rice seeds have one and only one rice seed per pelleted rice seed.

The mechanism of the present invention is: the present invention adopts neutral bentonite and talcum powder with different fineness, in order to prevent the physical shrinkage of the material in the drying process from forming cracks on the surface of the seed coat, and the material with large fineness can be filled in the material with small fineness. In the crack that forms; Neutral bentonite: Talcum powder and gum arabic: The mass ratio of water is after considering the bonding characteristic of material when meeting water, chooses to make the comprehensive quality such as appearance quality, dissolution effect, strength of pelletized rice seed coating compare At the same time, fertilizers, insecticides, antibacterial and disease control agents, anti-cold agents, anti-drought agents, growth regulators and other ingredients can be added to the seed coating formula according to actual needs to meet different needs in actual production.

The seed pelletization method adopts a layer-by-layer wrapping pelletization method, which is not only convenient to operate, but also has a good dissolution effect, and is conducive to the slow release of the added active ingredients and reduces the loss of the active ingredients. At the same time, in the pelleted rice seeds prepared by the method, each pelleted rice seed has only one rice seed, and realizes the purpose of single seed sowing during rice mechanized precision direct seeding.

Compared with the prior art, the present invention has the following advantages and effects:

(1) The present invention is designed for the current situation that the agronomic requirement of 1 grain/hole when planting high-quality rice (such as super hybrid rice variety Y Liangyou No. 1) contradicts the requirement of 3 to 5 grains/hole of the existing rice direct-seeding machinery, The rice direct seeding machine is difficult to achieve the sowing requirement of 1 grain/hole, the reason mainly lies in the physical characteristics of rice seeds, the elongated shape with an aspect ratio of 4:1, and the fine and dense hairs on the surface of the shell make the rice seeds poor in fluidity. Therefore, the present invention starts from making rice seeds regular in shape, approaching spherical shape, uniform in size, smooth in surface, and seed coat with a certain strength and cracked quickly when exposed to water, so as to realize the pelletization of rice seeds and achieve the purpose of precision sowing of rice direct seeding.

(2) The filler in the granulated powder of the present invention is mixed with two kinds of powders with different particle sizes, and there is no crack after drying.

(3) The filler components in the granulated powder of the present invention can be purchased directly without additional crushing.

(4) The present invention uses water as the binder in the primary granulation to ensure that the seed coat can be cracked quickly after being exposed to water.

(5) The processing method is layer-by-layer granulation to ensure the single-seed rate and seed-bearing rate after granulation.

(6) Compared with other rice seeds such as film coating and seed soaking, the present invention completely changes the original shape of the seeds, and helps to simplify the equipment for direct seeding of rice.

(7) The present invention is different from the cracking form (dissolving type) of pelleted seeds enjoyed in China. The cracking form of the pelleted seed coat is a cracking type, and the added active ingredients are not easy to lose and fully play their role.

Description of drawings

Fig. 1 is a process flow diagram of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1

Mix bentonite (purchased from Guangzhou Yuxin Chemical (Xinxin Chemical) Co., Ltd.) and talcum powder (purchased from Guangzhou Yuxin Chemical (Xinxin Chemical) Co., Ltd.) uniformly at a mass ratio of 1:4 to obtain a filler . Prepare an aqueous solution of gum arabic in a ratio of adding 20 g of gum arabic to every 100 g of water, and soak for 9 hours to obtain a binding agent. Put 10g of Y Liangyou 1 (Ma Guohui et al. Research on optimal slow-release nitrogen fertilizer dosage and density configuration of super hybrid rice Y Liangyou 1. Hybrid rice, 2008,23(06):73-77) seeds into the seed at 40r /min in the 5ZY-450 seed pelletizing machine (purchased from Nanjing Agriculture and Animal Husbandry Machinery Factory), while spraying 0.8g water, add 10g filler, repeat the above operation once every 40 seconds; after 4 minutes, spray water The amount is 1.5g, the amount of filler added is 20g, and the above operation is carried out every 60 seconds; after 7 minutes, use a separation sieve with a hole diameter of 6mm to glue the filler, single-granulated seeds and multi-seeds The granulation groups together are separated; the filler and the seeds that have been successfully granulated continue to fall into the separation sieve with a hole diameter of 4 mm, and the fillers are separated into granules and the seeds with poor granulation effect are combined with the single granulation. The seeds that are granulated and successfully increased in size are separated, and the seeds left on the separation sieve with a hole diameter of 4mm are called the first-level granulated seeds; the seeds that pass through the separation sieve with a hole diameter of 4mm continue to be 1.5g according to the amount of water sprayed. , the amount of filler added is 20g to continue the initial granulation, repeat the operation once every 60 seconds, and separate the primary granulated seeds twice with a separating sieve at an interval of 4 minutes. After 8 minutes, pour the first-stage granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 40r/min, change the water into a binder, the dosage is 6.78g, and the dosage of the filler is 85g, every 90 Repeat the above operation once every second; after 3 minutes, the seeds are slowly sent into the separation sieve with a hole diameter of 6mm, and the seeds left on the separation sieve with a hole diameter of 6mm are called secondary granulated seeds; Separate the sieve and stay on the seeds on the separating sieve with a hole diameter of 4mm to continue secondary granulation, and use the separating sieve with a hole diameter of 6mm to separate the secondary granulated seeds every 3 minutes. After 6 minutes, pour the secondary granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 40r/min, spray 8.47g of binder and add 85g of filler at the same time, repeat the above operation once every 90 seconds After 10 minutes, the seeds are slowly sent into the separation sieve with a hole diameter of 10mm, and the seeds on the separation sieve with a hole diameter of 10mm are said to be three-stage granulated seeds; Pour it into the 5ZY-450 seed pelletizing machine with a rotating speed of 40r/min, spray 5.25g of binder and add 50g of filler at the same time, repeat the above operation every 90 seconds, and use a hole diameter of The 10mm separating sieve separates the three-stage granulated seeds; after 12 minutes, pour all the three-stage granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 40r/min, and spray 20g of binder while Add 85g filler and repeat the above operation once every 120 seconds; after 8 minutes, send the pelletized three-stage granulated seeds into the electric blast drying oven (purchased from Guangzhou Zhengyi Technology Co., Ltd., model DHG-9070A ), dry at a constant temperature of 35°C for 24 hours, and store in airtight packaging.

Example 2

Mix bentonite (purchased from Guangzhou Yuxin Chemical (Xinxin Chemical) Co., Ltd.) and talcum powder (purchased from Guangzhou Yuxin Chemical (Xinxin Chemical) Co., Ltd.) in a mass ratio of 2:9 to obtain a filler . The ratio of adding 16.7g of gum arabic to every 100g of water is equipped with a gum arabic water solvent, and soaked for 7 hours to obtain a binding agent. Pour 15g of Yuxiang Youzhan (Shu Shifu et al. Effects of mechanical deep application of slow-release fertilizer on the physiological characteristics of precision hole-directed super rice. Journal of Agricultural Engineering, 2011, 27(3): 89-92) into the seeds at a speed of 35r /min into the 5ZY-450 seed pelletizing machine, while spraying 1.5g of water, add 22.5g of filler, and perform the above operation once every 45 seconds; after 5 minutes, the amount of sprayed water is 2.55g, and then add filler The dosage is 37.5g, and the above operation is carried out every 55 seconds; after 8 minutes, use a separating sieve with a hole diameter of 6mm to separate the filler, the seeds that have been successfully granulated, and the granulated agglomerates that have multiple seeds stuck together; The granulated powder and seeds successfully granulated continue to fall into the separating sieve with a hole diameter of 4mm, and the granulated powder is separated into granules and seeds with poor granulation effect from the primary granulated seeds; Said that the seeds left on the separation sieve with a hole diameter of 4mm are primary granulated seeds; the seeds passed through the separation sieve with a hole diameter of 4mm continue to be 2.55g according to the amount of water sprayed, and the amount of filler added is 37.5g to continue Carry out the initial granulation, repeat the operation once every 55 seconds, and separate the primary granulated seeds twice with a separating sieve at intervals of 5 minutes. After 10 minutes, pour the primary granulated seeds into the 5ZY-450 seed pelletizing machine whose rotation speed is 35r/min, change the water into binder, the dosage is 10.5g, and the dosage of filler is 135g, every 100 Repeat the above operation once every second; after 5 minutes, the seeds are slowly sent into the separation sieve with a hole diameter of 6mm, and the seeds left on the separation sieve with a hole diameter of 6mm are called secondary granulated seeds; Separate the sieve and stay on the seeds on the separating sieve with a hole diameter of 4mm to continue secondary granulation, and use the separating sieve with a hole diameter of 6mm to separate the secondary granulated seeds every 5 minutes. After 10 minutes, pour the secondary granulated seeds into the 5ZY-450 seed pelletizing machine with a rotating speed of 35r/min, spray 13.5g of binder while adding 135g of filler, and repeat the above operation every 100 seconds Once; after 12 minutes, the seeds are slowly sent into the separation sieve with a hole diameter of 10mm, and the seeds left on the separation sieve with a hole diameter of 10mm are called three-stage granulated seeds; the seeds that pass through the separation sieve with a hole diameter of 10mm are Continue to pour into the 5ZY-450 seed pelletizing machine with a rotating speed of 35r/min, spray 9g of binder while adding 90g of filler, repeat the above operation every 100 seconds, and use a hole diameter of 6.5 minutes every 6.5 minutes. The 10mm separation sieve separates the three-stage granulated seeds; after 14 minutes, pour all the three-stage granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 35r/min, and spray 20g of binder while Add 135g filler and repeat the above operation once every 130 seconds; after 7 minutes, send the pelletized three-stage granulated seeds into the electric blast drying oven (purchased from Guangzhou Zhengyi Technology Co., Ltd., model DHG-9070A ), dry at a constant temperature of 30°C for 26 hours, and store in airtight packaging.

Example 3

Neutral bentonite (purchased from Guangzhou Yuxin Chemical (Xinxin Chemical) Co., Ltd.) and talcum powder (purchased from Guangzhou Yuxin Chemical (Xinxin Chemical) Co., Ltd.) were evenly mixed in a mass ratio of 1:5 to obtain filler. The gum arabic solvent is prepared according to the ratio of adding 18g gum arabic to every 100g water, and soaked for 8 hours to obtain the binding agent. Put 20g of Xiushui 134 (Chen Xiaoyang et al. Effects of nitrogen application level and planting density on the growth and yield of late japonica rice Xiushui 134. Fujian Daomai Science and Technology, 2010 (01)) into 5ZY-450 seeds with a rotation speed of 70r/min In the pelletizing machine, while spraying 1.8g of water, add 25g of filler, and carry out the above operation once every 50 seconds; after 6 minutes, the amount of water sprayed is 3.2g, and the amount of filler added is 45g, and the above operation is carried out every 65 seconds Operate once; after 9 minutes, use a separating sieve with a hole diameter of 6mm to separate the filler, the seeds that have been successfully granulated from a single seed, and the granulated clusters that have been glued together with multiple seeds; The seeds continue to fall into the separation sieve with a hole diameter of 4mm, and the granulated powder is separated into granules and seeds with poor granulation effect from the primary granulation seeds; The seeds above are primary granulated seeds; the seeds that pass through the separation sieve with a hole diameter of 4mm will continue to be granulated according to the amount of water sprayed at 3.2g and the amount of filler added at 45g to continue the initial granulation, and the operation will be repeated every 65 seconds , with an interval of 5 minutes to separate the primary granulated seeds twice with a separating sieve. After 10 minutes, pour the primary granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 70r/min, change the water into a binder, the dosage is 13g, and the filler dosage is 170g, every 120 seconds Repeat the above operation once; After 6 minutes, the seeds are slowly sent into the separation sieve with a hole diameter of 6 mm, and the seeds left on the separation sieve with a hole diameter of 6 mm are called secondary granulated seeds; Sieve and stay on the seeds on the separating sieve with a hole diameter of 4 mm to continue secondary granulation, and use a separating sieve with a hole diameter of 6 mm to separate the secondary granulated seeds every 6 minutes. After 12 minutes, pour the secondary granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 70r/min, spray 17g of binder while adding 170g of filler, and repeat the above operation once every 120 seconds After 14 minutes, the seeds are slowly sent into the separation sieve with a hole diameter of 10mm, and the seeds on the separation sieve with a hole diameter of 10mm are said to be three-stage granulated seeds; Pour it into the 5ZY-450 seed pelletizing machine with a rotating speed of 70r/min, spray 10g of binder while adding 100g of filler, repeat the above operation every 100 seconds, and use a hole diameter of 10mm every 7 minutes After 15 minutes, pour all the three granulated seeds into the 5ZY-450 seed pelletizing machine with a rotation speed of 70r/min, and spray 20g of binder while adding 160g filler, repeat the above operation once every 150 seconds; after 6 minutes, send the pelletized three-stage granulated seeds into the electric blast drying oven (purchased from Guangzhou Zhengyi Technology Co., Ltd., model DHG-9070A) Dry at a constant temperature of 33°C for 30 hours, and store in airtight packaging.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. A seed coating formula for direct seeding of rice, characterized in that: it contains a filler and a binding agent. 2. the seed coating formula for direct seeding of rice according to claim 1, is characterized in that: Described filler comprises neutral bentonite and talcum powder; The fineness of described neutral bentonite and talcum powder is different; The mass ratio of the neutral bentonite to talcum powder is 1: (4-5); The binder is an aqueous solution obtained by mixing soluble resin and water at a mass ratio of 1:(5-6). 3. utilize claim 1 or 2 described seed coating formulas for the direct seeding of paddy rice to realize the seed pelletization method, it is characterized in that comprising the steps: (1) Preparation of binder: mix soluble resin with water, soak, and stir to completely dissolve soluble resin in water to obtain binder; (2) Preparation of filler: mix neutral bentonite and talcum powder, stir evenly to obtain filler; (3) Initial granulation: Pour rice seeds into the seed pelletizing machine, spray water and add filler at the same time, perform the above operation every 40-50 seconds; after 4-6 minutes, every 55-65 seconds Repeat the operation once; after 7 to 9 minutes, the preliminarily granulated seeds are sent into a separation sieve with a hole diameter of 6 mm, and the filler and single granulated seeds continue to fall into the separation sieve with a hole diameter of 4 mm, and the remaining The seeds on the separation sieve with a hole diameter of 4mm are primary granulated seeds; the seeds that pass through the separation sieve with a hole diameter of 4mm continue to be granulated for the first time, and are separated with a separation sieve with a hole diameter of 4mm every 4 to 5 minutes The first-level granulated seeds are produced until less than 1% of the seeds pass through a separation sieve with a hole diameter of 4mm; (4) Secondary granulation: Pour the primary granulated seeds obtained in step (3) into the seed pelletizing machine, spray the binder and add the filler at the same time, and perform the above operation every 90 to 120 seconds After 3 to 6 minutes, the seeds are sent into the separation sieve with a hole diameter of 6mm, and the seeds that remain on the separation sieve with a hole diameter of 6mm are called secondary granulated seeds; The seeds on the separation sieve with a hole diameter of 4mm continue to be granulated for the second time, and the secondary granulated seeds are separated with a separation sieve with a hole diameter of 6mm every 3 to 6 minutes until less than 0.5% of the seeds pass through the hole diameter 6mm separating sieve; (5) Three-time granulation: Pour the secondary granulated seeds obtained in step (4) into the seed pelletizing machine, spray the binder while adding the filler, and perform the above operation every 90-120 seconds; After 10 to 14 minutes, the seeds are sent into the separation sieve with a hole diameter of 10mm, and the seeds left on the separation sieve with a hole diameter of 10mm are called three-stage granulated seeds, and the seeds that pass through the separation sieve with a hole diameter of 10mm are continued. Carry out three times of granulation, every 6 to 7 minutes use a separation sieve with a hole diameter of 10mm to separate the three-stage granulated seeds, until less than 0.05% of the seeds pass through the separation sieve with a hole diameter of 10mm; Grade pelleted seeds; (6) After 12 to 15 minutes, pour all the three granulated seeds into the seed pelletizing machine, spray the binder and add the filler at the same time, repeat every 120 to 150 seconds; after 6 to 8 minutes, the pelleted rice seeds; (7) Dry the pelleted rice seeds and store in sealed packages. 4. The method for pelleting seeds according to claim 3, characterized in that: the pelleted rice seeds described in step (6) has only one rice seed per pelleted rice seed. 5. The seed pelletizing method according to claim 3, characterized in that: The amount of sprayed water described in step (3) is 8-10% of the mass of rice seeds; The amount of filler added in step (3) is 1 to 1.5 times the mass of rice seeds; The amount of water sprayed after 4-6 minutes in step (3) is 15-17% of the mass of rice seeds, and the amount of filler added is 2-2.5 times of the mass of rice seeds. 6. The seed pelleting method according to claim 3, characterized in that: the amount of the binder sprayed in step (4) is 0.6 to 0.7 times the mass of rice seeds; The amount of filler added in the step (4) is 8 to 9 times the mass of rice seeds; The amount of the binder sprayed in the step (5) is 0.8 to 0.9 times the mass of the rice seeds; The amount of filler added in the step (5) is 8 to 9 times the mass of rice seeds; When continuing to carry out three granulations in step (5), the amount of sprayed binder is 0.4 to 0.6 times the mass of rice seeds, and the amount of filler added is 4 to 6 times the mass of rice seeds; Repeat the above operation for 120 seconds. 7. The seed pelleting method according to claim 3, characterized in that: the rice seeds include seeds of all rice varieties; The mixing condition described in step (1) is to mix the soluble resin and water at a mass ratio of 1: (5-6) at a temperature above 15°C; Described soluble resin is gum arabic; The soaking time described in step (1) is more than 7 hours; The rotating speed of described seed pelletizing machine is 35～70r/min; The mixing of neutral bentonite and talcum powder described in step (2) is mixing neutral bentonite and talc powder in a mass ratio of 1: (4-5); The fineness of described neutral bentonite and talcum powder is different. 8. The seed pelleting method according to claim 3, characterized in that: the amount of the binder sprayed in step (6) is 1 to 2 times the mass of rice seeds; The amount of filler added in the step (6) is 8 to 9 times the mass of rice seeds; The drying condition in the step (7) is constant temperature drying at 30-35° C. for 24-30 hours. 9. The application of the seed coating formula for direct seeding of rice according to claim 1 or 2 on the mechanized precision direct seeding of rice. 10. Application of the seed pelleting method described in any one of claims 3 to 8 in mechanized precision direct seeding of rice.

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