Method for recommending nitrogen fertilizer for crop according to relative SPAD (Soil and Plant Analyzer Development) value of plant leaf

Abstract

The invention relates to a method for recommending a nitrogen fertilizer for wheat according to a relative SPAD (Soil and Plant Analyzer Development) value of a plant leaf. The method comprises the following steps: 1) setting field trial treatment (cells) of different nitrogen application levels, so as to cover gradient levels of soil nitrogen supply from nitrogen deficiency to excessive nitrogen supply; 2) testing the yield of wheat of soil under different nitrogen supply levels, and calculating an optimal soil nitrogen supply amount with the maximum wheat yield according to the relationship of the wheat yield and the soil nitrogen supply amount; 3) testing leaf SPAD values under different soil nitrogen supply conditions, calculating the relative SPAD value, and establishing a relationship model of the relative SPAD value and the soil nitrogen supply; and 4) testing the SPAD value of wheat to be supplied with the nitrogen fertilizer, calculating a relative SPAD value, and confirming the nitrogen fertilizer recommending amount according to the optimal soil nitrogen supply amount and the relationship model of the relative SPAD value and the soil nitrogen supply amount. By adopting the method provided by the invention, dynamic demands of the crop on a nitrogen nutrient component can be precisely matched, so that the yield of the crop can be increased, and the nitrogen fertilizer utilization efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of crop fertilization, and in particular relates to a method for recommending the amount of topdressing nitrogen fertilizer for crops (such as winter wheat) by using the relative SPAD value of plant leaves. Background technique [0002] Using plant nutrition diagnosis technology to recommend fertilization can accurately match the dynamic demand of crops for nutrients, improve crop yield and nutrient use efficiency, and reduce resource waste. It is one of the important methods for the development of precision agriculture. [0003] In recent years, plant nutrition diagnosis and fertilization technology has received extensive attention, and great progress has been made in both research and practical application. Among them, SPAD-502 is a portable chlorophyll speed measuring instrument produced by Japan Konica Minolta Company, which determines the relative content of chlorophyll in leaves by measuring the light transmitta...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for recommending nitrogen fertilizers for crops by using the relative SPAD value of leaves, which can overcome the error caused by recommending the applicable amount of nitrogen fertilizer according to the SPAD value level of leaves a

Images