Method for screening rice variety with high nitrogen fertilizer utilization efficiency

Abstract

The invention discloses a method for screening a rice variety with high nitrogen fertilizer utilization efficiency, the method comprises the following steps: the light distribution and light attenuation coefficient (KL) in the canopy and the nitrogen distribution and nitrogen attenuation coefficient (KN) in the canopy under different cultivation conditions of the field at the specific growth period of the rice culture. By using the light-nitrogen matching index (KN/KL) in the canopy at the blooming stage as the evaluation index, the rice variety with higher nitrogen fertilizer utilization efficiency is screened out. The variety with a canopy light-nitrogen matching index of 0.35 is a variety with high nitrogen fertilizer utilization, and the variety with a canopy light nitrogen matching index of 0.2 is a variety with low nitrogen fertilizer utilization efficiency. By using the method, the rice variety with high yield and high nitrogen fertilizer utilization efficiency can be screened out from the photosynthetic physiological angle of the canopy.

Description

technical field [0001] The invention relates to a method for screening rice varieties with high nitrogen utilization efficiency, and belongs to the technical field of rice screening. Background technique [0002] Nitrogen is one of the three major nutrients necessary for plant growth. For most farmland soils, nitrogen fertilizer application is needed to solve the shortage of soil nitrogen fertilizer supply to maintain and increase crop yield. Rice is the main food crop in my country, which needs a large amount of nitrogen. For a long time, it has relied on a large amount of nitrogen fertilizer and other chemical fertilizers to increase rice production. However, the excessive use of nitrogen fertilizer not only greatly increases the cost of rice production, but also causes serious pollution to the surrounding water environment. Therefore, cultivating and selecting rice varieties with high nitrogen utilization efficiency is of great significance for reducing the application ...

AI Technical Summary

Problems solved by technology

At present, the evaluation indicators of nitrogen use efficiency mainly include the following, nitrogen fertilizer agronomic use efficiency (AE), nitrogen fertilizer physiological use efficiency (PE), nitrogen fertilizer uptake efficiency (RE), nitrogen fertilizer partial productivity (PFP) and grain yield utilization efficiency (IE ), the determination of these indicators is mainly based on the determination of nitrogen content, dry matter weight, leaf area and yield at the whole plant level (Wei Haiyan et al., 2007; Zhang Yali et al., 2008; Ji Lin et al., 2012; Jucheng et al. Xin et al.; 2015; Chen Pingping, 2017), generally showing three deficiencies: First, the error in the determination of the nitrogen content parameters of the samples is relatively large, and the nitrogen content determination is generally carried out by the Kjeldahl method. 1. In the whole process from powder sample to weighing sample, it is difficult to ensure that the samples selected each time are representative and can represent the nitrogen content of the whole plant; second, the measurement cycle of nitrogen fertilizer use efficiency indicators is long, and most indicators need to be established in the measurement of yield parameters Therefore, the measurement of nitrogen fertilizer use efficiency requires a long cycle; third, light environment factors are not included in the evaluation system, and light is the energy source for photosynthesis of green plants

Images