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

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