Grain yield response to stubble leaf blade clipping in rice ratooning in southwestern Japan
Grain yield response to stubble leaf blade clipping in rice ratooning in southwestern Japan
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日本西南部水稻再生过程中残茬叶片修剪对产量的影响
DOI：
10.1002/agj2.20834
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发表时间：
2021
期刊：
影响因子：
2.1
通讯作者：
Hakata Makoto
中科院分区：
文献类型：
--
作者：
Nakano Hiroshi;Tanaka Ryo;Nakagomi Koji;Hakata Makoto
近年来，水稻再生产因其比传统方法具有更高的产量潜力而受到人们的关注。2019年和2020年在日本西南部进行了田间试验，以确定水稻品种（北疆193和高产品系[HYL]）和残茬叶处理（修剪和控制）对水稻再生期第一、二季产量的影响。2019年，由于小穗数m−2较低，剪叶处理两种水稻第二季的产量均低于对照处理。因此，提高残茬叶面积指数（LAI）可能通过增加单株颖花数来提高二季籽粒产量。在2020年，HYL在剪叶处理下的第二季产量低于对照处理，这是由于小穗数m−2较低。然而，北陆193的产量在两种剪叶处理之间没有差异。尽管2019年两种水稻茬中非结构碳水化合物（NSC）含量没有差异，但北ku 193在2020年的NSC含量高于HYL，这是由于第一季颖花数m−2和灌浆率较低。这些结果表明，当NSC含量高时，残茬叶片的贡献可能会降低，因为当NSC含量低时，叶片可能会弥补NSC含量的不足。
Rice (Oryza sativaL.) ratooninghas recently attracted attention due to its higher yield potential compared with that of conventional methods. Field experiments were conducted in southwestern Japan in 2019 and 2020 to determine the effect of rice type (Hokuriku 193 and high‐yielding line [HYL]) and stubble leaf treatment (clipping and control) on the grain yields of the first and second crops in rice ratooning. In 2019, both rice types produced lower grain yields of the second crop in the leaf clipping treatment than the control treatment due to the lower spikelet number m−2. Therefore, increasing the leaf area index (LAI) in the stubble may improve the grain yield of the second crop by increasing the spikelet number per area. In 2020, HYL produced a lower grain yield of the second crop in the leaf clipping treatment than the control treatment due to the lower spikelet number m−2. However, the grain yields of Hokuriku 193 did not differ between the two leaf clipping treatments. Although the nonstructural carbohydrate (NSC) content in the stubble did not differ between the two rice types in 2019, Hokuriku 193 had a higher NSC content than HYL in 2020 due to the lower spikelet number m−2and lower percentage of filled spikelets of the first crop. These results suggest that the stubble leaf blade contribution may be reduced when the NSC content is high as the leaf blades may compensate for the lack of NSC content when the NSC content is low.