Biochar slow-release base fertilizer special for sweet potatoes and preparation method thereof

Abstract

The invention provides a biochar slow-release base fertilizer special for sweet potatoes. The biochar slow-release base fertilizer comprises a core layer and a coating layer coating the surface of the core layer. The core layer is formed by mixing of the following components by weight part: 60-80 of crop waste, 0.5-1.0 of Aspergillus oryzae, 6-8 of furfural residue, 2-4 of chili seed, 10-15 of clay, 15-20 of urea, 18-22 of calcium magnesium phosphate fertilizer, 30-40 of diammonium phosphate, 20-25 of potassium chloride, 2-4 of ferrous sulfate, 1-2 of chelated iron, 80-90 of biochar powder, and 0.2-0.4 of a fertilizer additive. The weight of the core layer accounts for 50%-60% of the total weight of the slow-release fertilizer. The coating layer is a mixture of biochar powder and a binder, and the weight of the coating layer accounts for 40%-50% of the total weight of the slow-release fertilizer. The nutrients of the fertilizer provided by the invention are slowly released under control, one-time fertilization can meet the demand of crops for fertilizer in the whole growth period, fertilizer consumption is reduced, and sweet potato yield is increased.

Description

Technical field [0001] The invention relates to the field of agricultural fertilizers, in particular to a biochar slow-released sweet potato special base fertilizer and a preparation method thereof. Background technique [0002] Chemical fertilizer is the material guarantee for sustainable agricultural development and the material basis for increasing grain production. In the 1980s, the application of chemical fertilizers contributed about 46.3% to the increase in my country’s grain production. The application of fertilizers greatly promoted my country’s grain production. However, in the 1990s, while chemical fertilizer input increased linearly, grain output However, according to statistics, between 1996 and 2009, the use of chemical fertilizers in my country increased by 41.2%, while total grain output only increased by 5.1%. The increasing input of chemical fertilizers did not continue to increase grain output. An important reason for this phenomenon is that the reduction in fe...

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Problems solved by technology

In the 1980s, the application of chemical fertilizers contributed about 46.3% to the increase in grain production in my country. The application of fertilizers greatly promoted the production of grain in my country. However, in the 1990s, while the input of chemical fertilizers increased linearly, the grain output According to statistics, from 1996 to 2009, the use of chemical fertilizers in my country increased by 41.2%, while the total grain output only increased by 5.1%. The increasing input of chemical fertilizers did not continue to increase grain output.

Although there is no big gap with the world in terms of traditional chemical fertilizer varieties, the utilization rate of chemical fertilizers is low, especially nitrogen fertilizer, which is 30% lower than the international level, causing economic losses of tens of billions of yuan and serious environmental pollution every year.

The current chemical fertilizer market is mainly dominated by fully soluble, instant, and quick-dispersion fertilizers, which intensifies the waste and loss of fertilizers

Commonly used quick-acting fertilizers have a short period of action. In production, topdressing must be done several times to meet the nutrient requirements of crops throughout the growth period. This not only takes a lot of labor and increases the cost of fertilization, but also causes a large loss of surface fertilizer during topdressing, which is significantly reduced. Fertilizer effect, it is difficult to exert the yield increasing effect of fertilizer

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