Method for quantifying nitrogen absorption and nitrogen nutrition contribution of non-root organs of crops

Abstract

The invention relates to the technical field of crop nutrition management and fertilization, in particular to a method for quantifying nitrogen absorption and nitrogen nutrition contribution of non-root organs of crops, which specifically comprises the following steps that an isolation micro-area is arranged in a crop field, and crops are planted; before the nitrogen fertilizer is sprayed to the crops, a high-molecular water-absorbent resin layer is laid in the isolation micro-area; 15 N isotope fertilizer liquid with the concentration of 0.5%-0.75% is sprayed on leaf surfaces; the macromolecular water-absorbent resin layer is moved out and weighed, and the mass difference value m of the macromolecular water-absorbent resin layer before and after spraying of the 15N isotope fertilizer liquid is calculated; the 14N fertilizer liquid is poured into the isolation micro-area, whereinthe mass of the 14N fertilizer liquid is m, and the concentration of the 14N fertilizer liquid is equal to that of the 15N isotope fertilizer liquid; measuring parameters after the crops are mature; and calculating the non-root organ nitrogen absorption amount and the contribution rate of the non-root organ nitrogen absorption amount to crop nitrogen nutrition. According to the method, non-root organ nitrogen absorption amount and contribution of the non-root organ nitrogen absorption amount to crop nitrogen nutrition in a canopy foliage nitrogen fertilizer spraying fertilization mode are quantified based on isolation first and then compensation of a 15N isotopic tracer mark.

Description

Technical field [0001] The present invention relates to the field of plant nutrition and fertilizer management, particularly to a method of non-nitrogen plant root absorption and an organ quantitative contribution of nitrogen nutrition. Background technique [0002] Above-ground crops, especially young stems and leaves and other organs from the same root as a non-root absorption and utilization of nutrients can, crop nutrients through the leaves and stems and other non-root organ shoot absorption of nutrients function crops collectively referred to as fertilizer effect. Effect of foliar fertilization the root crops are equivalent effect. Foliar fertilizer nutrient uptake, high efficiency, targeted, can significantly improve the nutritional status of the blades and to improve crop yield and quality, has become the modern agriculture Another important addition to soil fertilization fertilization practices, more and more Pay attention to. [0003] Nitrogen is the largest crop demand...

AI Technical Summary

Problems solved by technology

[0004] Yet the problem that prior art exists has, in the process of foliage spraying nitrogen fertilizer ( figure 1 ), a part of nitrogen is absorbed by non-root organs such as stems and leaves above the ground, but a large part of the water and fertilizer solution will pass through the crop canopy and enter the soil to be absorbed by the roots of the crops, that is to say, the nitrogen absorbed by the crops contains both root absorption and The nitrogen absorbed by non-root organs such as stems and leaves is currently lacking effective research methods to determine the amount of nitrogen absorbed by non-root organs, so it is impossible to draw the proportion of nitrogen absorbed by non-root organs in the total nitrogen absorbed by crops ( Contribution rate to crop nitrogen nutrition); Quantitative non-root organ nitrogen absorption alone will help to further clarify the mechanism of nitrogen nutrient absorption integrated with micro-spraying water and fertilizer and the mechanism of high-efficiency utilization of nitrogen fertilizer

Images