›› 2018, Vol. 30 ›› Issue (12): 1992-2000.DOI: 10.3969/j.issn.1004-1524.2018.12.02

• Crop Science • Previous Articles     Next Articles

Differences of yield, accumulation and translocation properties of dry matter and N, and N use efficiency between indica-japonica hybrid rice and japonica rice

CHEN Gui1, CHEN Mei2, ZHANG Hongmei1, WANG Shilei1, SHI Weiming2, CHENG Wangda1   

  1. 1. Jiaxing Academy of Agricultural Science, Jiaxing 314016, China;
    2. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
  • Received:2018-02-12 Online:2018-12-25 Published:2018-12-28

Abstract: A field experiment was conducted to study the differences of yield, yield response to nitrogen (N) fertilizer application based on the individual and the unit area within indica-japonica hybrid rice cultivars Yongyou 12 and Jiayouzhongke 6, and japonica rice cultivar Xiushui 134 under respective planting densities. Meanwhile, yield components, accumulation and redistribution properties of dry matter and N, and N use efficiencies were also studied. The results showed that the yield based on the individual, unit area and daily output of Yongyou 12 and Jiayouzhongke 6 were higher than that of Xiushui 134, among which the difference of individual yield was more obvious. Although the spike number of unit area and seed setting rate of indica-japonica hybrid rice were relatively lower, the advantages of large panicle with more spikelets were more obvious. With the increase of N fertilizer input, the yields of Yongyou 12 and Jiayouzhongke 6 showed increasing trend. While, the yield of Xiushui 134 began to decline when N input was over 200 kg·hm-2. The accumulations of dry matter and N for both individual and unit-area rice plants of Yongyou 12 and Jiayouzhongke 6 were higher than that of Xiushui 134, of which the individual difference was more obvious. Generally speaking, translocation amounts or efficiencies of dry matter and N for the unit-area in Yongyou 12 and Jiayouzhongke 6 were relatively lower than those of Xiushui 134. Yongyou 12 and Jiayouzhongke 6 showed higher N use efficiencies, which is mainly characterized as higher N uptake efficiency, other than physiological N use efficiency. In conclusion, the indica-japonica hybrid rice cultivars possessed obviously stronger abilities in biomass development and N uptake compared to the japonica rice cultivar. However, their translocation amount and efficiency were lower. Compared with its N uptake efficiency, the physiological N use efficiency in indica-japonica hybrid rice cultivars should be further improved.

Key words: indica-japonica hybrid rice, japonica rice, yield, accumulation and translocation properties, N use efficiency

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