Soil Fertilizer Detector Analyzes Climate Warming and Fertilizer Application

Climate warming has an impact on the growth and yield of crops. It also affects the process of soil biophysical and chemical changes, and it also has a certain effect on soil fertility changes. Nitrogen, phosphorus and potassium are the three main elements of soil fertilization. Among them, nitrogen is the most active and its fertilizer effect is very sensitive to changes in the ambient temperature. Higher temperatures will accelerate the release of nitrogen. The soil fertilizer detector can effectively measure the relevant nutrient content in the soil. The total nitrogen content in the soil is an indicator to identify the soil fertility, but it cannot directly determine the ability of the soil to supply the nitrogen required by the crop at a certain time. . This is because total nitrogen cannot generally be absorbed directly by plants and must be converted to inorganic nitrogen through microbial decomposition of the soil in order to be used by plants. The activity of soil microorganisms and the resulting changes in soil available nitrogen content are closely related to temperature. Through the experiment of adding different amounts of urea to the soil stage, the dynamic changes of available nitrogen content in soil were determined, and the response of soil fertilizer effect to temperature was discussed. There is no consideration of crop nitrogen uptake. Only the loss of soil available nitrogen at different temperatures is discussed.

Dynamic curve of nitrogen release process of two kinds of fertilizer at different temperature levels. The abscissa represents the days after fertilization, and the ordinate represents the soil available nitrogen content. As can be seen from the figure, as the temperature rises, the curvature of the curve increases, the release rate of nitrogen is accelerated, and the cycle is shortened. The increase in temperature accelerates the decomposition of fertilizers in the soil, resulting in increased nitrogen release and faster rates. Only the effect of temperature increase on the efficiency of available nitrogen fertilizer in bare soil was discussed. If considering the temperature increase to accelerate the absorption of nitrogen fertilizer by crops, the loss of nitrogen fertilizer will be more and faster.

Through the determination of the soil fertilizer detector, it was found that the temperature increased, the release rate of available nitrogen accelerated, and the release period was shortened. Under the conditions of 450-1125 kg/ha urea application, the average release period was shortened by 3.6 days per 1'C increase in temperature. According to the rule of nitrogen release with time at different temperatures, the fertilization time should be mastered. The best fertilizer effect is the maximum and fastest fertility stage of crops. This is even more important after a warming climate.

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