Ternary slow-release compound fertilizer and preparation method thereof

Abstract

The invention relates to a ternary slow-release compound fertilizer comprising a felted / coated type slow-release organic / inorganic compound fertilizer and a microbial agent, wherein the weight of the microbial agent is 0.5-5% of the weight of the felted / coated type slow-release organic / inorganic compound fertilizer. The invention further relates to a preparation method of the slow-release compound fertilizer. The ternary slow-release compound fertilizer provided by the invention is prepared by using the technological method comprising the steps of granulating through organic / inorganic compounding, coating an organic high-polymer on the surface of a product granule and adhering a microbial agent (powder) on the surface of the coating, so that affects on the activity and the group number of beneficial micro-organisms caused by inorganic salt and high impurity-bacterial rate of an inorganic fertilizer are avoided, and the effective viable count is kept to reach the standard. The preparation method provided by the invention is simple and convenient to operate and mild in condition, and can be used for realizing the industrial production by being cooperated with the traditional technical apparatus.

Description

technical field [0001] The invention relates to the fields of agriculture and ecological environment, in particular to a slow-release, organic-inorganic-biological ternary compound fertilizer and a preparation method thereof. Background technique [0002] Fertilizer is the material basis for high-yield and high-quality crops. Various data show that 50% of crop yield comes from fertilization. Since the German chemist Liebig proposed the mineral nutrition theory of plants in 1840, chemical fertilizers have become an indispensable material guarantee in agricultural production. It is generally believed that chemical fertilizers account for about 40% of the world's grain production. After the 1960s, my country began to use a large amount of chemical fertilizers, and the grain output also increased significantly. At present, my country uses more than 30% of the world's chemical fertilizers on 9% of the world's arable land, thus producing 20% ​​of the world's grain. The contributi...

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Problems solved by technology

[0007] 1. Unreasonable strain ratio and single function

The strains selected for bio-fertilizer are relatively single, and it is difficult to form a dominant bacterial group in the soil, and cannot achieve comprehensive effects such as nitrogen fixation, phosphorus and potassium dissolution, disease resistance, and stress resistance.

[0008] 2. The effective number of viable microorganisms is difficult to reach the standard

The traditional method is to mix and granulate microbial fertilizers with organic fertilizers and inorganic fertilizers. In this process, organic fertilizers need to be sterilized and it is difficult to realize industrialization; inorganic fertilizers (nitrogen, phosphorus, and potassium fertilizers) have a killing effect on microorganisms, causing microbial loss. live, lose fat

[0009] 3. High granulation and drying temperature

Excessively high temperature causes a large number of microorganisms to die and reduce their activity

[0010] 4. High moisture content of finished granules

Excessive moisture will easily lead to a decrease in the number of effective viable bacteria during storage and shorten the validity period of the fertilizer

[0011] 5. The dosage form of the product still needs to be improved

The particle size is large, the particle surface is rough, and the commerciality of the fertilizer is poor; the particle strength is low, and it is easy to break during storage and transportation

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