Garden controlled-release fertilizer and preparation method thereof

Abstract

The invention discloses a garden controlled-release fertilizer which is prepared from compound fertilizer particles, an inhibitor layer, a microelement layer, an organic fertilizer layer and a controlled-release coating material layer, wherein the compound fertilizer particles are a compound fertilizer prepared from a plurality of fertilizers; the inhibitor layer is prepared from a urease inhibitor and a nitrification inhibitor; the microelement layer is prepared from industrial waste residues, tailing slag and attapulgite; the controlled-release coating material is prepared from ammonium magnesium phosphate and calcium carboxymethylcellulose. The controlled-release fertilizer is prepared from the following ingredients in parts by weight: 20 to 25 parts of urea, 10 to 15 parts of ammoniumphosphate, 10 to 15 parts of monopotassium phosphate, 15 to 20 parts of monoammonium phosphate, 5 to 10 parts of biochar, 5 to 10 parts of plant ash, 0.06 to 3 parts of inhibitor, 15 to 25 parts of microelements, 15 to 25 parts of organic fertilizer, 3 to 9 parts of controlled-release coating material and 2 to 6 parts of adhesive. The controlled-release fertilizer contains nitrogen, phosphorus andpotassium which are necessary to the plants, further contains microelements, can ensure that the quality and yield of plants are improved, can effectively inhibit nitrogen element loss, can improve soil tilth, has strong controlled-release capacity and water retention capacity and can prevent a soil structure from being damaged.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, in particular to a slow-release fertilizer for gardens. Background technique [0002] my country has a vast land, and its arable land accounts for 7% of the world's total. However, the large population makes the per capita arable land area very small. With 7% of the world's arable land, it is necessary to feed 22% of the world's population, and with the process of urbanization, the arable land area decreases , so the requirements for increasing agricultural production with decreasing arable land area are getting higher and higher, and the increase in agricultural production depends on the effectiveness of chemical fertilizers. Traditional chemistry faces two major problems in the process of agricultural production and use: one is the large amount of chemical fertilizers used and the utilization rate is low. In my country, the utilization rate of nitrogen fertilizer in the current season is 30-...

AI Technical Summary

Problems solved by technology

Traditional chemistry faces two major problems in the process of agricultural production and use: one is the large amount of chemical fertilizers used and the utilization rate is low. In my country, the utilization rate of nitrogen fertilizer in the current season is 30-35%, the utilization rate of phosphorus fertilizer is 10-25%, and the utilization rate of potassium fertilizer is 35%- 50%; Second, the use of chemical fertilizers is unreasonable. At present, the use of quick-acting fertilizers in my country is still dominated by batches of quick-acting fertilizers. The utilization rate is low, the fertilizer effect period is short, and the cost is high, which pollutes the environment.

However, the slow-release fertilizer uses hexamethylenetetramine and polyisocyanate as the coating film. Hexamethylenetetramine is corrosive and causes dermatitis and itching after contact with the human body. It is also flammable and decomposes toxic nitrogen oxides when heated. Flue gas and polyisocyanate are relatively volatile, irritating and toxic. During the production process, they not only cause great harm to the human body, but also have higher requirements for production safety, and also have a great impact on the plant root system after fertilization, and the coating film volatilizes. After degradation, the slow-release ability is reduced, resulting in rapid release of active ingredients, which cannot achieve the effect of continuous absorption and utilization by plants

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