Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (12): 1-8.doi: 10.11924/j.issn.1000-6850.casb2023-0308

Special Issue: 水稻

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Early-late Season Double-cropping Rice Cultivars: Differences of Yield and Nitrogen Uptake in Early and Late Seasons in South China

ZOU Jixiang(), YANG Taotao, WU Longmei, BAO Xiaozhe, ZHANG Bin()   

  1. Rice Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory of New Technology in Rice Breeding/Guangdong Rice Engineering Laboratory/Key Laboratory of Genetics and Breeding of High Quality Rice in Southern China (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Guangzhou 510640
  • Received:2023-04-27 Revised:2023-07-15 Online:2024-04-25 Published:2024-04-22

Abstract:

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.

Key words: early-late season double-cropping rice, ‘Simiao rice’, yield, dry matter accumulation, nitrogen uptake