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Yield Potential of Machine-Transplanted Rice and Correlation of Crop-Growing Rate during Grain-Filling Stage

文献类型： 外文期刊

作者： Ding, Chao 1 ; Zhu, Xuhui 2 ; Xu, Congshan 2 ; Cambula, Elidio 2 ; Lu, Bo 2 ; Luo, Xikun 2 ; Wu, Qiong 2 ; Zhong, Qiuyi 2 ; Xu, Xia 2 ; Liu, Zhenghui 2 ; Ding, Yanfeng 2 ; Yang, Jie 1 ; Li, Ganghua 2 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing 210014, Peoples R China

2.Nanjing Agr Univ, Natl Engn & Technol Ctr Informat Agricultrue, Jiangsu Collaborat Innovat Ctr Modern Crop Prod, Key Lab Crop Physiol & Ecol Southern China, Nanjing 210095, Peoples R China

关键词： machine-transplanted rice; grain yield; nitrogen; crop-growing rate

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 10 期

页码：

收录情况： SCI

摘要： Not enough attention has been paid to the comparison in yield performance and N responsiveness between hybrid rice and inbred rice using the large number of new cultivars released after 2000 under machine transplanting. Field experiments were conducted in 2017 and 2018; 48 widely planted rice cultivars included four groups, namely indica hybrids (IHs), japonica inbreds (JIs), indica-japonica hybrids (IJHs), and indica inbreds (Hs) that were transplanted by machine with three nitrogen fertilizer levels (0, 150, 300 kg ha(-1)). The average yield of the hybrids (IHs, IJHs) was higher than that of JIs or IIs with a higher crop-growing rate (CGR) during the total growth duration, regardless of the N application level; moreover, longer total growth duration was responsible for the higher yield in IJHs than in IHs. The IHs had a large gap yield which mainly came from the genetic improvement in the CGR during the grain-filling stage. The yield gap was relatively small in JIs, and longer growth duration combined with optimal daily mean temperature during the grain-filling stage was the critical factor for high yield. The JIs or IJHs had higher yield under the N300 level, while the response of IHs to nitrogen varied with different cultivars. Cultivars with higher CGR during the grain-filling stage had higher yield under the N300 level. In conclusion, this study suggests that high CGR during the grain-filling stage may be a vital trait for the development of rice with high yield and high N responsiveness at machine transplanting.

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