Early-late Season Double-cropping Rice Cultivars:Differences of Yield and Nitrogen Uptake in Early and Late Seasons in South China
In order to clarify the differences in the yield and nitrogen uptake of early-late season double-cropping rice between early and late seasons in South China,six early-late season double-cropping rice cultivars were planted in early and late seasons according to local high-yield cultivation measures to determine the yield,yield components,dry matter accumulation,nitrogen uptake,etc.The yield of early-late season double-cropping rice were 6.68-7.91 t/hm2 and 5.72-6.11 t/hm2 planted in early and late season,respectively.The yield in early season was significantly higher than that in late season,with an average increase of 1.53 t/hm2.Correlation analysis showed that the higher grain yield in early season was related to the increase in the panicle number and grain weight.There were significant differences in dry matter accumulation and nitrogen uptake between early and late seasons.The dry matter accumulation and nitrogen uptake in early season was increased by 25.0％and 29.5％,respectively,compared to those in late season.In addition,the grain yield of early-late season double-cropping rice were significantly positively correlated with the dry matter accumulation and nitrogen uptake.Early-late season double-cropping rice had higher grain yield,dry matter production and nitrogen uptake capacity when planted in early season.These results provide a theoretical basis for the high-yield cultivation of early-late season double-cropping rice in South China.
early-late season double-cropping rice'Simiao rice'yielddry matter accumulationnitrogen uptake
NETL
NSTL
万方数据
