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CN-116396124-B - Slow-release fertilizer suitable for Hainan brick red soil

CN116396124BCN 116396124 BCN116396124 BCN 116396124BCN-116396124-B

Abstract

The invention discloses a slow release fertilizer suitable for Hainan brick red soil, which comprises a fertilizer core and a coating layer, wherein the fertilizer core comprises, by weight, 10-20 parts of isobutylidene diurea, 1-3 parts of 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts of dicyandiamide DCD, 20-30 parts of humic acid and 30-50 parts of an organic fertilizer, and the coating layer comprises, by weight, 5-10 parts of natural nanotube halloysite, 3-5 parts of bentonite, 5-10 parts of cyclodextrin, 1-3 parts of polyglutamic acid, 1-3 parts of pyroligneous liquor and 5-10 parts of polyacrylamide. The isobutyl biuret, humic acid and organic fertilizer can effectively supplement organic matters and nitrogen in iron bauxite, maintain the nitrogen level of soil, and the 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate and dicyandiamide DCD can effectively control the conversion of ammonium nitrogen in brick red soil to nitrate nitrogen, thereby reducing nitrogen loss, realizing stable supply of nitrogen, and the polyglutamic acid and polyacrylamide have strong water-retaining capacity, and the fertilizer core is coated by a coating layer, so that the effects of slow release and water retention are achieved.

Inventors

  • ZHANG WEN
  • CHEN MIAO
  • HE CUICUI
  • LIU HUIRAN
  • WU JINGSEN

Assignees

  • 中国热带农业科学院环境与植物保护研究所

Dates

Publication Date
20260505
Application Date
20230516

Claims (4)

  1. 1. The slow release fertilizer suitable for the Hainan brick red soil is characterized by comprising a fertilizer core and a wrapping layer; The fertilizer core consists of the following raw materials, by weight, 10-20 parts of isobutylidene diurea, 1-3 parts of 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts of dicyandiamide DCD, 20-30 parts of humic acid and 30-50 parts of organic fertilizer; The wrapping layer comprises the following raw materials, by weight, 5-10 parts of natural nanotube halloysite activated by dilute hydrochloric acid, 5-10 parts of cyclodextrin, 1-3 parts of polyglutamic acid, 1-3 parts of pyroligneous liquor and 5-10 parts of polyacrylamide; The organic fertilizer is coconut chaff, soybean meal or cotton meal, and the cyclodextrin is one of beta-cyclodextrin, hydroxypropyl beta-cyclodextrin, alpha-cyclodextrin and gamma-cyclodextrin.
  2. 2. The slow release fertilizer suitable for Hainan tile red soil according to claim 1, wherein the fertilizer core is composed of the following raw materials, by weight, 15 parts of isobutylidene diurea, 2 parts of 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, 1 part of dicyandiamide DCD, 25 parts of humic acid and 40 parts of organic fertilizer.
  3. 3. The slow release fertilizer for Hainan tile red soil according to claim 1, wherein the coating layer is composed of, by weight, 8 parts of natural nanotube halloysite activated by dilute hydrochloric acid, 8 parts of cyclodextrin, 3 parts of polyglutamic acid, 2 parts of wood vinegar and 8 parts of polyacrylamide.
  4. 4. The method for preparing the slow release fertilizer applicable to the Hainan tile red soil according to any one of claims 1-3, which is characterized by comprising the following steps: uniformly mixing isobutyl diurea, 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, dicyandiamide DCD, humic acid and organic fertilizer, and granulating to obtain a fertilizer core; Soaking natural nanotube halloysite in dilute hydrochloric acid, and sequentially filtering, washing and drying to obtain natural nanotube halloysite activated by the dilute hydrochloric acid; Dissolving cyclodextrin, polyglutamic acid, pyroligneous acid and polyacrylamide into an organic solvent, and then adding the natural nanotube halloysite activated by dilute hydrochloric acid for heating treatment to obtain a coating material, wherein the technical parameters of the heating treatment comprise the heating temperature of 40-50 ℃ and the heating time of 8-10 h; and coating the fertilizer core by using the coating material to obtain the fertilizer.

Description

Slow-release fertilizer suitable for Hainan brick red soil Technical Field The invention belongs to the technical field of fertilizers, and particularly relates to a slow release fertilizer suitable for Hainan brick red soil. Background The brick red soil is strong acid iron bauxite with a dead branch and fallen leaf layer, a dark red brown surface layer and a brick red iron aluminum residue layer B under a tropical rain forest or a quaternary rain forest. The Hainan brick red soil area has deep soil body, uneven texture, easy cultivation and wide variety preference, but the irrigation water source is insufficient, so that drought threat is usually caused, the nutrient loss is serious, the nutrient content is low, and the crops are poor in growth and low in yield due to phosphorus and potassium deficiency. There is no fertilizer specific to the soil texture of the Hainan brick red soil area in the market, so the fertilizer specific to the soil texture of the Hainan brick red soil area is beneficial to improving the crop yield of the Hainan brick red soil area. Disclosure of Invention Aiming at the prior art, the invention provides a slow release fertilizer suitable for Hainan brick red soil, so as to provide a slow release fertilizer aiming at the soil characteristics of Hainan brick red soil. In order to achieve the aim, the invention adopts the technical scheme that the slow release fertilizer suitable for Hainan brick red soil is provided, and comprises a fertilizer core and a wrapping layer; The fertilizer core comprises the following raw materials, by weight, 10-20 parts of isobutylidene diurea, 1-3 parts of 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts of dicyandiamide DCD, 20-30 parts of humic acid and 30-50 parts of organic fertilizer; the wrapping layer comprises, by weight, 5-10 parts of natural nanotube halloysite, 5-10 parts of cyclodextrin, 1-3 parts of polyglutamic acid, 1-3 parts of wood vinegar and 5-10 parts of polyacrylamide. On the basis of the technical scheme, the invention can be improved as follows. Further, the organic fertilizer is coconut chaff, soybean meal or cotton meal. Further, the fertilizer core comprises the following raw materials, by weight, 15 parts of isobutylidene diurea, 2 parts of 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, 1 part of dicyandiamide DCD, 25 parts of humic acid and 40 parts of organic fertilizer. Further, the wrapping layer comprises the following raw materials, by weight, 8 parts of natural nanotube halloysite, 8 parts of cyclodextrin, 3 parts of polyglutamic acid, 2 parts of wood vinegar and 8 parts of polyacrylamide. Further, the cyclodextrin is one of beta-cyclodextrin, hydroxypropyl beta-cyclodextrin, alpha-cyclodextrin and gamma-cyclodextrin. The invention also provides a preparation method of the slow release fertilizer suitable for Hainan brick red soil, which comprises the following steps: uniformly mixing isobutyl diurea, 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate, dicyandiamide DCD, humic acid and organic fertilizer, and granulating to obtain a fertilizer core; soaking natural nanotube halloysite in dilute hydrochloric acid, and then sequentially filtering, washing and drying to obtain activated nanotube halloysite; Dissolving cyclodextrin, polyglutamic acid, pyroligneous acid and polyacrylamide into an organic solvent, and then adding the activated nanotube halloysite for heating treatment to obtain a coating material; and coating the fertilizer core by using the coating material to obtain the fertilizer. Further, the technological parameters of the heating treatment comprise that the heating temperature is 40-50 ℃ and the heating time is 8-10 h. The invention has the beneficial effects that the isobutyl diurea, humic acid and organic fertilizer can effectively supplement organic matters and nitrogen in iron bauxite, maintain the nitrogen level of soil, have low solubility in water, can effectively control the release of nitrogen, and simultaneously can achieve the effect of improving the soil, increase the soil aggregate structure and improve the crop yield through the combined action of the isobutyl diurea and polyacrylamide. The 3, 4-dimethyl-1H-pyrazole dihydrogen phosphate and dicyandiamide DCD can effectively control the conversion of ammonium nitrogen in the brick red soil to nitrate nitrogen, thereby realizing the stable supply of nitrogen, reducing the leaching loss of nitrate nitrogen and the discharge of nitrogen oxide, and further improving the utilization rate of chemical fertilizers. The invention also utilizes the tubular structure of halloysite, the excellent water absorption characteristic of the ring paste, the excellent sterilization and growth promotion functions of wood vinegar, and the net structure of polyglutamic acid and polyacrylamide solution to form a coating layer to coat the fertilizer core, thereby achieving the effects of slow release, water retention and growth promotion. Detailed Descript