{0><}0{>Cotton field urea application method based on soil nitrogen balance

Abstract

The invention discloses a cotton field urea application method based on soil nitrogen balance, which specifically includes the following steps: (1) determining the total amount of nitrogen application in the whole growth period of cotton according to the target yield, and calculating the total amount of urea application according to the nitrogen content of urea (2) Apply urea three times during the whole growth period of cotton; (3) Take soil samples according to the S-shaped route before each fertilization, according to the principle of equal amount, random, and multi-point mixing. The present invention is based on soil nitrate nitrogen supply, cotton nutrient demand, and fertilizer yield response, and considers the full utilization of inorganic nitrogen in cotton field soil and soil fertility maintenance. The total amount of urea application is about 30% to 40% lower than that of conventional fertilization, which can improve The utilization rate of nitrogen fertilizer is 5-10 percentage points, which greatly improves economic benefits, does not harm crops, wastes resources, pollutes soil and groundwater sources, does not threaten farmland environment and human health, and can ensure environmental friendliness and sustainable agriculture.

Description

technical field [0001] The invention relates to the technical field of agricultural fertilization, in particular to a method for applying urea in cotton fields based on soil nitrogen balance. Background technique [0002] my country's nitrogen fertilizer consumption accounts for more than 30% of the world's total, but the nitrogen utilization rate is only about 30%. Nitrogen is one of the macroelements necessary for crop growth and development. Nitrogen fertilizer applied to the soil produces a stimulating effect, increases microbial activity, accelerates the mineralization of soil organic nitrogen, produces more available nitrogen for crops, improves root activity, and increases root activity. space. The most used nitrogen fertilizer in cotton production is urea. Urea, also known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen and hydrogen. Urea contains a large amount of nitrogen. Too much urea in cotton fields will cause greed Green and leggy g...

AI Technical Summary

Problems solved by technology

The most used nitrogen fertilizer in cotton production is urea. Urea, also known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen and hydrogen. Urea contains a large amount of nitrogen. Too much urea in cotton fields will cause greed Green and leggy growth, excessive vegetative growth, limited reproductive growth, seriously affect cotton production, not only waste nitrogen fertilizer resources, but also cause nitrate nitrogen leaching, seriously pollute groundwater sources, threaten ecological security and human health, and cause damage to farmland environment. Therefore, it is very necessary to apply urea appropriately, timely, correctly and scientifically in cotton production