A method to quantify crop nitrogen uptake by non-root organs and their contribution to nitrogen nutrition

Abstract

The invention relates to the technical field of crop nutrition management and fertilization, in particular to a method for quantifying nitrogen absorption by non-root organs of crops and its contribution to nitrogen nutrition, which specifically includes setting isolated micro-zones in crop fields and then planting crops; before spraying nitrogen fertilizer on crops, A layer of polymer water-absorbing resin is laid in the isolated micro-area; the concentration of spraying on the leaves is 0.5%-0.75% 15 N isotope fertilizer solution; remove the polymer water-absorbent resin layer and weigh it, calculate 15 The mass difference m of the polymer water-absorbent resin layer before and after the spraying of N isotope fertilizer liquid; 15 N isotopic fertilizer solution equal 14 The N fertilizer solution is supplemented into the isolated micro-plot; the parameters are measured after the crops are mature; the nitrogen uptake by non-root organs and its contribution rate to crop nitrogen nutrition are calculated. The present invention is based on "isolate first and then compensate 15 "N isotope tracer label" to quantify non-root organ nitrogen uptake and its contribution to crop nitrogen nutrition under canopy foliar nitrogen spray fertilization.

Description

technical field [0001] The invention relates to the field of crop nutrition management and fertilization, in particular to a method for quantifying nitrogen absorption by non-root organs of crops and nitrogen nutrition contribution. Background technique [0002] The aboveground parts of crops, especially young stems and leaves and other non-root organs, can absorb and utilize nutrients like roots. The nutrients absorbed by crops through stems and leaves and other aboveground non-root organs are collectively referred to as the foliar fertilizer effect on crops. The effect of foliar fertilizer on crops is equivalent to that of root fertilizer. Foliar fertilization has fast nutrient absorption, high utilization rate, and strong pertinence. It can significantly improve the nutritional status of leaves and thus improve crop yield and quality. It has gradually become another important fertilization measure in modern agriculture besides soil fertilization. Pay attention to. [00...

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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

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