A method of quantitatively replacing chemical fertilizers with organic fertilizers

Abstract

The invention belongs to the technical field of fertilizer application, and particularly relates to a method for application of organic fertilizer substituting chemical fertilizer in a quantitative manner. The method comprises the following steps of: S1, according to the crop growth environment, estimating the obtainable yield of a certain field under the best nutrient management measures according to the average yield of the crop in the past several years; S2, respectively calculating the agronomic efficiency of nitrogen fertilizer and the total quantity of nitrogen required to achieve the obtainable yield; S3, according to principle that the nitrogen nutrient of the organic fertilizer substitutes the nitrogen nutrient of the chemical fertilizer in a quantitative manner, respectively calculating the recommended application quantity of the organic fertilizer and the quantity of the nitrogen fertilizer substituted by the organic fertilizer; and S4, performing fertilizer application according to the recommended quantity of the organic fertilizer to the field, wherein the recommended quantity of the organic fertilizer is obtained through calculation. The method disclosed by the invention has the advantages of simplification, quantification, rationalization and the like. By only evaluating the crop growth environment and the soil fertility status, and using the key parameters such as the obtainable yield, nitrogen fertilizer reaction indexes and organic fertilizer substitution indexes, the total application quantity of the nitrogen fertilizer and the organic fertilizer can be quickly and accurately estimated, and the crop yield and the nitrogen use efficiency are effectively increased.

Description

technical field [0001] The invention belongs to the technical field of fertilizer application, and in particular relates to an application method for quantitatively replacing chemical fertilizers with organic fertilizers. Background technique [0002] Chemical fertilizers are an important guarantee for food security, contributing 40%-50% to the increase in food production. Since the 1980s, the total amount of chemical fertilizers used in my country has increased from 16 million tons (converted to pure) to 59.9 million tons in 2014, an increase of 270%. Even in the past 10 years, my country's chemical fertilizer use is still at 2.7% per year speed is growing. At present, the amount of chemical fertilizer per unit area of ​​cultivated land in my country is 329 kg / ha, which is 2.6 times that of the United States and 2.5 times that of the European Union. However, the utilization rate of fertilizer nutrients in my country is low. The seasonal utilization rate of nitrogen fertili...

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Problems solved by technology

In addition, if the substitution ratio is out of balance, it is very easy to cause crop yield reduction, soil heavy metal pollution, and harmful substances such as antibiotics to accumulate in the soil

[0007] At present, this field has not provided a systematic solution to the above problems. Previous studies have not fully considered how to quickly estimate the total application of target nutrients, and have not proposed long-term stable fertilizer nutrient quantification according to crop types and planting areas. Substituting the appropriate ratio of organic fertilizer nutrients has led to the widespread occurrence of unreasonable organic fertilizers

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