Factors Affecting Variance in Yield Caused by Different Transplanting Times in High-Yield and Good-Eating-Quality Rice

日本作物学会紀事

article

荒井（三王） 裕見子¹  岡村 昌樹²  吉永 悟志²  矢部 志央理¹  荻原 均³  小林 伸哉¹ 

[1]農研機構作物研究部門

[2]農研機構中日本農業研究センター

[3]農研機構本部

关键词: Rice;    Shoot dry weight;    Sink capacity;    Solar radiation;    Transplanting time;    Yield;   

DOI  :  10.1626/jcs.91.129

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

To avoid farm work competition and explore the possibility of diversification of cropping, we evaluated the yield and yield characteristics of the transplanting times (early, middle and late) in rice (Oryza sativa L.) for three years using three high-yielding cultivars, “Akidawara”, “Yamadawara” and “Toyomeki”, which have high eating quality. The later the transplanting time, the lower the filled brown rice yield. Sink capacity and the increase in shoot dry weight during grain filling tended to be smaller the later the transplanting time. To reveal the factors lowering the yield in late transplanting, we carried out several analyses under various climate conditions. The relationship between Y/S value, obtained from dividing yield (Y, g m–2) by cumulative solar radiation (S, MJ m–2) from 30 days before heading to 20 days after heading, and the average daily temperature in the same periods were approximated by a quadratic equation, meaning yield could be explained well by temperature and solar radiation. The maximum value in Y/S was found at around 23.4 to 24.0 ºC. On the other hand, it was inferred that the lower yield in late transplanting was affected not by the average daily temperature before and after heading but by the lower average daily solar radiation.

【 授权许可】

CC BY