Grain yield response to cultivar and harvest time of the first crop in rice ratooning in southwestern Japan
Grain yield response to cultivar and harvest time of the first crop in rice ratooning in southwestern Japan
复制标题
日本西南部水稻再生稻产量对品种和收获时间的响应
DOI：
10.1002/csc2.20645
复制
发表时间：
2021
期刊：
影响因子：
2.3
通讯作者：
Nakano Hiroshi
中科院分区：
文献类型：
--
作者：
Tanaka Ryo;Hakata Makoto;Nakano Hiroshi
水稻再生由于其与常规方法相比更高的产量潜力而受到关注。在此，于2019年和2020年在日本西南部进行了田间试验，以确定品种（“Takanari”，indicacultivar和“Koshihikari”，japonicacultivar）和第一季收获时间（早期和晚期）对再生稻第一季和第二季籽粒产量的影响。对于越光来说，2019年第二季的谷物产量在收获时间之间没有差异。然而，高成在收获后期的谷物产量较低。高纳里有较少的小穗，更少的填补小穗，和较低的1,000粒重在后期收获。然而，对于2020年的Takanari来说，收获时间之间的谷物产量没有差异。在2019年，从早到晚收获，残茬非结构性碳水化合物（NSC）含量没有增加，而残茬叶面积指数（LAI）在收获期之间下降;这种差异在高成比越光更明显。相反，2020年，NSC含量从早到晚收获增加，但留茬LAI在收获期之间没有差异。因此，2019年晚收高成的籽粒产量较低可能是由于留茬LAI较低导致小穗较少。相比之下，2020年从早收到晚收保持的籽粒产量可能归因于通过较高的留茬NSC含量维持小穗数。因此，充分的留茬LAI和NSC是提高第二季产量的关键。
Rice (Oryza sativaL.) ratooning has attracted attention due to its higher yield potential compared with conventional methods. Here, field experiments were conducted in southwestern Japan in 2019 and 2020 to determine the effects of cultivar (‘Takanari’, anindicacultivar, and ‘Koshihikari’, ajaponicacultivar) and harvest time of the first crop (early and late) on the grain yields of the first and second crops in rice ratooning. For Koshihikari in 2019, grain yield of the second crop did not differ between harvest times. However, Takanari produced a lower grain yield at late harvest. Takanari had fewer spikelets, fewer filled spikelets, and a lower 1,000‐grain weight at late harvest. However, for Takanari in 2020, grain yield did not differ between harvest times. In 2019, the stubble nonstructural carbohydrate (NSC) content did not increase from early to late harvest, whereas the stubble leaf area index (LAI) decreased between harvest times; this difference was more apparent in Takanari than in Koshihikari. Contrastingly, in 2020, the NSC content increased from early to late harvest, but the stubble LAI did not differ between harvest times. Thus, the lower grain yield of late‐harvested Takanari in 2019 might be attributed to the lower stubble LAI resulting in fewer spikelets. In contrast, the maintained grain yield from early to late harvest in 2020 might be attributed to the maintenance of spikelet numbers via the higher stubble NSC content. Therefore, the sufficient stubble LAI and NSC could be essential for improving grain yield of the second crop.