›› 2019, Vol. 31 ›› Issue (1): 1-10.DOI: 10.3969/j.issn.1004-1524.2019.01.01

• Crop Science • Previous Articles     Next Articles

Effect of change of plant height on nitrogen use efficiency in Yongyou indica-japonica hybrid rice

WANG Feng1, SHEN Jianghua1, SUN Meimei1, CHAI Weigang1, YAO Hongyan1, DAI Yaolu1, ZHANG Yuping2, ZHU Defeng2, CHEN Ruoxia1,*   

  1. 1. Institute of Eco-Environmental Sciences, Ningbo Academy of Agricultural Sciences, Ningbo 315040, China;
    2. China National Rice Research Institute, Hangzhou 310006, China
  • Received:2018-06-20 Online:2019-01-25 Published:2019-04-09

Abstract: A field experiment was conducted to determine the precise effects of plant height on the grain yield and nitrogen use efficiency (NUE) in Yongyou indica-japonica hybrid rice, which aimed to provide reference data for rice breeding and high-NUE management of Yongyou series. This study was carried out at the single-season rice area of the coastal region of East Zhejiang (Sizhoutou town, Xiangshan County) in 2016. Six rice cultivars different in plant height (high straw, Yongyou12 & Yongyou15; medium straw, Yongyou7850 & Yongyou2640; short straw, Yongyou538 & Yongyou1540) and two treatments of chemical N application rates (N0, 0 kg·hm-2; N270, 270 kg·hm-2) were chosen for this study. Our results showed that the grain yield followed the sequence of Yongyou7850>Yongyou2640>Yongyou538>Yongyou1540>Yongyou12>Yongyou15 in different N treatments. Significant positive correlation was observed between grain yield and the maximum tiller number and effective panicle. Chemical N fertilization resulted in an increase of plant height, maximum tiller number and effective panicle. N recovery efficiency (NRE), N agronomy efficiency (NAE) and N partial factor productivity (NPFP) showed inconsistent trends in different cultivars. The NER in Yongyou12 and Yongyou15 were 37.4% and 36.4%, respectively, which were significantly higher than other cultivars (<30%). Contrarily, NPFP was significantly lower than Yongyou7850, Yongyou2640 and Yongyou538. Importantly, N harvest index (NHI) was the lowest in Yongyou12, indicating rice plant in the luxurious absorption of nitrogen. N surpluses were found in all rice cultivars under N treatments. N surpluses in Yongyou1540, Yongyou538, Yongyou15 and Yongyou7850 was more than 60 kg·hm-2, which was significantly higher than Yongyou2640 and Yongyou12. In conclusion, under the conventional practice conditions in the coastal region of East Zhejiang, the NUE of Yongyou series rice in high straw was higher than medium or short straw, while the grain yield was contrast because of biomass production and straw luxurious absorption of nitrogen.

Key words: Yongyou, indica-japonica hybrid rice, plant height, grain, yield, nitrogen ues efficiency

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