Analysis of Cool-weather Damage of Rice in 1993 Based on Data of Municipal Basis in Hokkaido

Japanese Journal of Crop Science

Shinji ICHIKAWA¹  Kazuto IWAMA¹  Noriaki MOGI¹  Toshihiro HASEGAWA¹ 

关键词: Air temperature;    気温;    Crop situation index;    作況指数;    Grain yield;    収量;    Percentage of ripening;    日照時間;    Sunshine hours;    稔実歩合;    Varietal difference;    品種間差異;   

DOI  :  10.1626/jcs.67.573

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Crop situation index(CSI, a ratio of yield to average yield over years)of paddy rice in the Hokkaido area in 1993 was 40, the lowest since 1949, because of a cool-weather damage. The yield and CSI, however, varied largely among 134 municipal areas of rice cultivation in Hokkaido. The yield ranged from 10kg ha-1 to 3, 820kg ha-1, and the GSI ranged from 0 to 68. The yield and CSI were highest in the northern part of Hokkaido, intermediate in the central part, and lowest in the southern and eastern parts. They tended to be lower in areas where an average yield of rice over the years was lower(r=0.719***). The difference in CSI between the areas was mainly due to sunshine hours and maximum air temperature from middle July to early August, although the effect on CSI was greater in sunshine hours than in maximum air temperature. Two rice varieties, Yukihikari and Kirara 397, although bred mainly to improve eating quality, were more tolerant against cool-weather damage than older varieties were. We therefore considered that the wide cultivation of these new varieties did not necessarily aggravate the cool-weather damage in 1993, although more tolerant varieties should be desirable in the future.

【 授权许可】

Unknown