Paddy-rice controlled-release fertilizer, and preparation method and application thererof

Abstract

The invention discloses a paddy-rice controlled-release fertilizer, and a preparation method and application thererof. The paddy-rice controlled-release fertilizer is prepared by employing potassium dihydrogen phosphate, urease and nitrification-inhibitor-containing slow-release urea as fertilizer core, attapulgite clay as an inner cladding and paraffin as an outer cladding, employing a fusion spraying coating method and performing granulation and sieving. The paddy-rice controlled-release fertilizer is simple in preparation method, low in cost, good in surface fineness, long in fertilizer conservation time and convenient to use, is capable of effectively improving nitrogen and phosphorus pollution conditions in farmland pollutants, provides fertilizer efficiency needed by various growth periods of paddy rice by applying to soil before transplantation of paddy rice, and helps to reduce excess fertilizing and repeated fertilizing, reduce fertilizing cost and improve output and quality of paddy rice.

Description

technical field

[0001] The invention relates to the technical field of controlled-release fertilizers. More specifically, it relates to a controlled-release fertilizer for rice and its preparation method and application. Background technique

[0002] Northeast rice is rich in various mineral elements such as nitrogen, phosphorus, and potassium. It is well-known throughout the country and sold overseas. However, the area of ​​rice only accounts for 3% of the country, and it is early-maturing single-cropping rice with relatively low yield. Therefore, in recent years, in order to purely pursue rice yield, over-cultivation and large-scale use of chemical fertilizers alone have caused the decline in soil organic matter content and fertility, and soil compaction. These phenomena have gradually attracted attention. And the method of applying base fertilizer by soil testing formula has been gradually and comprehensively promoted, and the physical and chemical properties of the soil...

Examples

Embodiment 1

[0034] A controlled-release fertilizer for rice, comprising the following raw materials in parts by weight:

[0035]

[0036]

[0037] The above-mentioned controlled-release fertilizer for rice comprises the following preparation steps:

[0038] (1) After potassium dihydrogen phosphate and nitrification inhibitor urea are pulverized, add urease, mix evenly with a mixer, and then send it to a YSL-80 granulator with a particle size of 3.2-4mm, and then cool to room temperature;

[0039] (2) Preheat the granular fertilizer prepared in step (1) in a BY300A type coating machine, dissolve 2 parts of rosin with 15 parts of absolute ethanol, and use a 1000W electronic multipurpose furnace to dissolve the rosin-ethanol mixture, K- Type 3 spray gun is directly sprayed onto the surface of nitrogen, phosphorus and potassium compound fertilizer particles, and 15 parts of attapulgite powder is added, the rotation speed is controlled at 60-70rpm, the inclination angle of the drum is 45...

Embodiment 2

[0047] Embodiment 2: The operation steps and method are the same as above, except that the mass percentage of the inner envelope layer is 12.94%.

Embodiment 3

[0048] Embodiment 3: The operation steps and method are the same as above, except that the mass percentage of the inner envelope layer is 19.07%.

[0049]The rice "Fengyou 301" was selected for the experiment, and the location was Liangjiashan Township, Shulan City, Jilin Province. The first 1-3 days after fertilization of embodiment 1, release amount is 4% of total amount; The 7th-10 day after fertilization, release amount is 11% of total amount; The 15th-20 day after fertilization, release amount It is 32% of the total amount; 24-28 days, the release amount is 55% of the total amount. The first 1-3 days after fertilization of embodiment 2, release amount is 10% of total amount; The 7th-10 day after fertilization, release amount is 20% of total amount; The 15th-20 day after fertilization, release amount 45% of the total amount; 24-28 days, the release amount is 70% of the total amount. The first 1-3 days after fertilization of embodiment 3, release amount is 8% of total amo...

technical field

[0001] The invention relates to the technical field of controlled-release fertilizers. More specifically, it relates to a controlled-release fertilizer for rice and its preparation method and application. Background technique

[0002] Northeast rice is rich in various mineral elements such as nitrogen, phosphorus, and potassium. It is well-known throughout the country and sold overseas. However, the area of ​​rice only accounts for 3% of the country, and it is early-maturing single-cropping rice with relatively low yield. Therefore, in recent years, in order to purely pursue rice yield, over-cultivation and large-scale use of chemical fertilizers alone have caused the decline in soil organic matter content and fertility, and soil compaction. These phenomena have gradually attracted attention. And the method of applying base fertilizer by soil testing formula has been gradually and comprehensively promoted, and the physical and chemical properties of the soil...

Examples

Embodiment 1

[0034] A controlled-release fertilizer for rice, comprising the following raw materials in parts by weight:

[0035]

[0036]

[0037] The above-mentioned controlled-release fertilizer for rice comprises the following preparation steps:

[0038] (1) After potassium dihydrogen phosphate and nitrification inhibitor urea are pulverized, add urease, mix evenly with a mixer, and then send it to a YSL-80 granulator with a particle size of 3.2-4mm, and then cool to room temperature;

[0039] (2) Preheat the granular fertilizer prepared in step (1) in a BY300A type coating machine, dissolve 2 parts of rosin with 15 parts of absolute ethanol, and use a 1000W electronic multipurpose furnace to dissolve the rosin-ethanol mixture, K- Type 3 spray gun is directly sprayed onto the surface of nitrogen, phosphorus and potassium compound fertilizer particles, and 15 parts of attapulgite powder is added, the rotation speed is controlled at 60-70rpm, the inclination angle of the drum is 45...

Embodiment 2

[0047] Embodiment 2: The operation steps and method are the same as above, except that the mass percentage of the inner envelope layer is 12.94%.

Embodiment 3

[0048] Embodiment 3: The operation steps and method are the same as above, except that the mass percentage of the inner envelope layer is 19.07%.

[0049]The rice "Fengyou 301" was selected for the experiment, and the location was Liangjiashan Township, Shulan City, Jilin Province. The first 1-3 days after fertilization of embodiment 1, release amount is 4% of total amount; The 7th-10 day after fertilization, release amount is 11% of total amount; The 15th-20 day after fertilization, release amount It is 32% of the total amount; 24-28 days, the release amount is 55% of the total amount. The first 1-3 days after fertilization of embodiment 2, release amount is 10% of total amount; The 7th-10 day after fertilization, release amount is 20% of total amount; The 15th-20 day after fertilization, release amount 45% of the total amount; 24-28 days, the release amount is 70% of the total amount. The first 1-3 days after fertilization of embodiment 3, release amount is 8% of total amo...

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