Fertilization and irrigation method for promoting rice glumous flower differentiation and reducing degradation

Abstract

The invention discloses a fertilization and irrigation method for promoting rice glumous flower differentiation and reducing degradation. The method is characterized by sequentially comprising the following steps that 1, rice base fertilizer is applied in a rice field before rice seedlings are transplanted, and the total nitrogen content of the rice base fertilizer is controlled to be 90-110 kg/ha, wherein the rice base fertilizer is composed of inorganic fertilizer and organic fertilizer, the nitrogen content of the organic fertilizer accounts for 60-70% of the total nitrogen content of the rice base fertilizer, and the nitrogen content of the inorganic fertilizer accounts for 30-40% of the total nitrogen content of the rice base fertilizer; 2, after transplanting, a chlorophyll instrument is adopted for measuring the SPAD value of leaves in the tillering early stage, the four leaf stage and the second leaf stage, and the nitrogen application amount is determined according to the SPAD value for variable topdressing; 3, moisture is precisely managed according to the stage of growth and development and set minimum soil water potential. The problem that too much nitrogen is accumulated in the plants in the spike differentiation process of modern high-yield rice varieties, particularly large-panicle super hybrid rice varieties to cause reduction of the number of final kernels per spike is solved, the yield is improved, and nitrogen fertilizer consumption and water irrigation amount are reduced.

Description

technical field [0001] The invention relates to the field of rice planting, in particular to a fertilization and irrigation method for promoting rice spikelet differentiation and reducing degradation. Background technique [0002] The analysis of the yield source-sink characteristics of rice varieties in my country in the past 50 years shows that with the evolution of varieties, the yield increases with the increase of total spikelets. From dwarf varieties to modern varieties, the number of panicles per unit area decreases slightly, and spikelets per panicle The number increased significantly with the evolution of the species. In the process of coordinating the contradictions among the number of spikes, number of grains, and weight of grains in cereal crops, the appropriate number of spikes per unit area has played a leading role, and "stabilizing the appropriate number of spikes and focusing on large spikes" is conducive to the contradiction between the quantity and quality ...

AI Technical Summary

Problems solved by technology

At present, there is a lack of fertilization and irrigation technologies that can promote rice spikelet differentiation and reduce degeneration

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