High-yield drop irrigation maize soil nutrient diagnosis and nitrogen fertilizer recommendation method

Abstract

The invention discloses a high-yield drop irrigation maize soil nutrient diagnosis and nitrogen fertilizer recommendation method which comprises the following steps: detecting the content of soil base mineral nitrogen (Nmin) before maize sowing, performing the fertilization treatment pre-stage test, and recommending the total nitrogen fertilization content of the high-yield drop irrigation maize in the total growth period under high-density cultivation conditions according to the fitted equation of the total nitrogen supply amount and yield; and measuring the soil mineral nitrogen content of the maize at each growth and development stage, and according to the fitted equation of the nitrogen supply amount and yield of maize at each growth and development period, determining the critical level of the nitrogen supply of the soil at each stage, and recommending the optimal topdressing amount at each stage. According to the high-yield drop irrigation maize soil nutrient diagnosis and nitrogen fertilizer recommendation method disclosed by the invention, the soil serves as a test object, the content of the mineral nitrogen (Nmin) in the soil is detected, the soil nitrogen supply condition is judged, the nitrogen supply capacity of the soil can be directly and accurately reflected by virtue of the measurement indexes, and the method has high practicality for guiding the fertilizing management of drop irrigation maize of which the planting density is 105000 plants / hm<2> and the target yield is more than 17000kg / hm<2>.

Description

technical field [0001] The invention relates to a high-yield drip irrigation corn soil nutrient diagnosis and nitrogen fertilizer recommendation method, in particular to a method for diagnosing high-yield drip irrigation corn soil nutrients and recommending nitrogen fertilizer topdressing according to soil mineral nitrogen content. Background technique [0002] Corn is one of the main grain crops in China. Its sown area and output both rank second in the world, and its annual output accounts for 20% of the world's total output. The application of nitrogen fertilizer is one of the important measures to increase the yield and improve the quality of corn. Excessive application of nitrogen fertilizer not only cannot further increase the yield of corn, but also causes serious waste of resources, and pollutes soil, water, and atmospheric ecological environment. Obtaining high yield through scientific fertilization, improving the utilization rate of nitrogen fertilizer, and reducin...

AI Technical Summary

Problems solved by technology

Under the conditions of drip irrigation and high-density planting, the fertilization method of corn lacks scientific quantitative standards in agricultural production, and it is difficult to obtain the best fertilization effect and target yield