Multi-layer charcoal powder coated slow release fertilizer special for vegetables and preparation method thereof

Abstract

The invention relates to the technical field of agricultural fertilizer, in particular to multi-layer charcoal powder coated slow release fertilizer special for vegetables and a preparation method thereof. The multi-layer charcoal powder coated slow release fertilizer special for the vegetables comprises fertilizer cores, wherein the outer sides of the fertilizer cores are sequentially covered with multiple layers of charcoal powder coating layers, the charcoal powder coating layers contain charcoal powder, and the granularity of the charcoal powder contained in the multiple layers of charcoalpowder coating layers, which are arranged inside and out increase gradually. According to the multi-layer charcoal powder coated slow release fertilizer special for the vegetables and the preparationmethod thereof, the charcoal powder in different particle size is adopted for coating the fertilizer, fine charcoal powder envelopes formed by the charcoal powder from coarse to fine are arranged inside and out respectively, the fertilizer coating shell strength is improved, the pore structures and pore diameters of charcoal of different coatings are controlled, processes of moisture penetrationand nutrient flowing out are retarded, the slow release effect is improved, the problems of fertilizer abuse, low utilization rates and the like in our country can be effectively solved, and a clean efficient utilization direction is provided for utilization of the charcoal.

Description

technical field [0001] The invention relates to the technical field of agricultural fertilizers, in particular to a special slow-release fertilizer for biochar powder multi-layer film-coated vegetables and a preparation method thereof. Background technique [0002] At present, vegetable planting is rapidly developing in scale and intensification, and a large amount of chemical fertilizers need to be applied in the process of vegetable planting. According to surveys, the utilization rate of chemical fertilizers in my country is only 35%-40%, and most of them are fixed by the soil or leached away, causing environmental problems such as eutrophication of water bodies and lakes. The excessive application of chemical fertilizers has caused serious degradation phenomena such as soil compaction, acidification, secondary salinization, and imbalance of nutrient ratios in the vegetable base, and the soil ecology has been seriously damaged. [0003] In recent years, researchers from v...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art, and to provide a special slow-release fertilizer for multi-layer film-coated vegetables of biochar powder and its preparation method. The present invention uses biochar powder of different particle sizes to coat the fertilizer for the first time , from the inside to the outside, the fine biochar powder shell is composed of coarse to fine biochar powder, which improves the strength of the fertilizer film shell, controls the pore structure and pore size of different film layers of biochar, and slows down the infiltration of water and the outflow of nutrients. , improve the slow-release effect, reduce the use of various chemical additives, effectively solve the problems of fertilizer abuse and low utilization rate in my country, and provide a clean and efficient utilization direction for the utilization of biochar

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