Large-scale summer corn soil phosphorus and potassium abundance and deficiency index construction method matched with agricultural productionand application

Abstract

The invention discloses a large-scale summer corn soil phosphorus and potassium abundance and deficiency index construction method matched with agricultural production. A basic database is constructedbased on summer corn fertilization yield, non-applied phosphate fertilizer yield, non-applied potash fertilizer yield, soil available phosphorus content and soil available potassium content, memory storage is carried out, the summer corn relative yield intervals are divided in the database, the relative yield in the corresponding interval range and the corresponding contents of available phosphorus and quick-acting potassium in the soil are kept, sub databases are formed, regression analysis on the contents of available phosphorus and available potassium in the soil and the relative yields ofthe available phosphorus and available potassium in the soil without applying phosphate fertilizer and potash fertilizer, characteristic values of the contents of available phosphorus and available potassium in the soil with deficiency, low content level, medium content level, high content level and extremely high content are determined, and an abundance and deficiency index system is constructed. According to the method, reasonable and effective summer corn farmland soil phosphorus and potassium nutrient abundance and deficiency indexes can be established under the conditions of large areasand big data.

Description

technical field [0001] The invention relates to the technical field of agricultural production, in particular to an improved method for establishing the abundance and deficiency indexes of phosphorus and potassium nutrients in summer corn farmland soil, which is used for farmland soil fertility evaluation, recommended fertilization, and precise management of regional fertilization. Background technique [0002] The traditional method for establishing soil phosphorus and potassium abundance and deficiency indicators is to conduct a correlation analysis between the soil available phosphorus content and available potassium content and the relative yield of crops without phosphorus and potassium fertilizers (see appendix figure 1 ), requiring its coefficient of determination R 2 to reach a significant level. Usually relative yield <65% is deficient, 65-75% is low content level, 75-85% is medium content level, 85-95% is high content level, >95% is extremely high content le...

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Problems solved by technology

[0003] However, in the case of large-scale and large regional differences in soil fertility, the coefficient of determination between the relative yield and soil available phosphorus and potassium content is difficult to reach a significant level, and it cannot match the actual local agricultural production, so it cannot be used to guide the regional level. Phosphorus and Potassium Nutrient Management

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