Response of Dry Matter Accumulation Characteristics and Yield of Cotton in North Jiangxi Cotton Region to Nitrogen Reduction Measures
In order to explore the effects of nitrogen reduction on the characteristic of dry matter accumulation and yield of cotton,4 treatments were set up,including conventional nitrogen treatment(N1,nitrogen application rate 345 kg·hm-2),20%nitrogen reduction treatment(N2,nitrogen application rate 276 kg·hm-2),20%nitrogen reduction combined with 10%organic fertilizer treatment(N3,nitrogen application rate 276 kg·hm-2,the ratio of chemical fertilizer and organic fertilizer was 9∶1)and no nitrogen treatment(N4),to analyze the responses of cotton dry matter accumulation characteristic parameters,yield and nutrient content to different nitrogen reduction treatments.The results showed that compared with N1 treatment,N2 and N3 treatments significantly increased the dry matter distribution ratio of reproductive organs at catkins period by 10.29%and 15.10%,shortened the dry matter accumulation time by 10.97%and 13.27%,and increased the dry matter accumulation fast growth period by 11.76%and 90.04%,accelerating the growth process of cotton.N4 treatment reduced the average rate of dry matter accumulation by 45.30%,and delayed the appearance time of the maximum rate of dry matter accumulation.The yield and economic benefit of seed cotton in 2 years were the highest in N3 treatment,which were 3 496.87 kg·hm-2 and 22 956.64 yuan,respectively.Therefore,N3 treatment,namely 20%nitrogen reduction combined with 10%manure,was a nitrogen reduction measure with high yield,fertilizer saving and the best economic benefits in northern Jiangxi cotton region.Above results provided guidance for reducing the amount of nitrogen fertilizer input in cotton growing area of northern Jiangxi.
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