Large-particle sustained and controlled release fertilizer

Abstract

The invention discloses a large-particle sustained and controlled release fertilizer. The fertilizer is prepared from the following raw materials in parts by mass: 10-25 parts of a nitrogen fertilizer, 8-12 parts of a phosphorus fertilizer, 15-25 parts of a potassium fertilizer, 2-5 parts of a medium and trace element fertilizer, 4-8 parts of a nitrification inhibitor and 1-5 parts of a seaweed active substance. The method comprises the steps: during use, carrying out coating controlled release on the nitrogen fertilizer by using a coating material to obtain the controlled-release nitrogen fertilizer; and mixing the controlled-release nitrogen fertilizer with the phosphate fertilizer, the potash fertilizer, the medium and micro element fertilizer and the seaweed active substance, adding the nitrification inhibitor for filling and slow release, extruding and granulating, curing, naturally cooling and screening to obtain the large-particle sustained and controlled release fertilizer. Theseaweed active substance is added into the large-particle sustained and controlled release fertilizer, so that the resistance of plants is improved; meanwhile, the nitrogen fertilizer is subjected tocoating controlled release by adopting a coating material, so that the prepared large-particle sustained and controlled release fertilizer combines sustained and controlled release and accurate fertilization can be realized; each sustained and controlled release fertilizer particle is uniform in nutrition, fixed in weight, convenient to apply and long in fertilizer efficiency period, and the fertilization frequency is reduced, so that the manual investment is reduced, and the utilization rate of the fertilizer is increased.

Description

technical field [0001] The invention belongs to the technical field of fertilizers and relates to a slow-controlled release fertilizer with large particles. Background technique [0002] my country's agricultural development has long relied on excessive application of chemical fertilizers to ensure output growth. However, the average utilization rate of fertilizers is more than 10% lower than that of developed countries. The nitrogen fertilizer is 30-35%, the phosphorus fertilizer is 10-25%, and the potassium fertilizer is 40-50%. Large inputs of chemical fertilizers have not always resulted in increased yields. For example, in the ten years from 1980 to 1995 in my country, the total amount of chemical fertilizer application increased by 183.1%, with an average annual increase rate of 7.2%. In 1995, the total application of chemical fertilizers reached about 36 million tons, while the total grain output increased by only 46.6% in the same period, with an average annual inc...

AI Technical Summary

Problems solved by technology

When fertilizing, the weight of nutrients that each adult fruit tree needs to fertilize is fixed, so a certain weight of fertilizer needs to be weighed for fertilization, which is very inconvenient in operation

The nutrients of ordinary slow-release fertilizers are not proportioned according to the ratio of nutrients required by fruit trees, so they cannot be supplied according to the nutrients required for fruit tree growth.

In addition, due to the rapid loss of nutrients such as nitrogen, phosphorus, and potassium, topdressing is often required, which increases the cost of fertilization

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