送風時期が水稲「白未熟粒」発生に及ぼす影響

日本作物学会紀事

吉田 智彦¹  大谷 和彦² 

[1]宇都宮大学農学部

[2]栃木県農業試験場

关键词: High temperature;    高温;    Chalky grains in rice;    白未熟粒;    Ventilation;    送風;    Day light hours;    日照時間;    Factors of occurrence;    発生要因;    Difference among cultivars;    品種間差異;   

DOI  :  10.1626/jcs.77.434

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Factors of occurrence of chalky grains including milky white rice grains, white-based rice grains and white-back grains in rice, were studied. From the analysis of the relationship with the percentage of first class grade rice produced in Tochigi prefecture, the weather conditions and the growth of rice, the factors causing occurrence of chalky grains in rice were found to be the saturation deficit and ventilation from 6 to 25 days after heading, the temperature for 20 days before and after heading, the daylight hours for 30 days before heading, and the number of spikelets per panicle. When kept under ventilation for 6-10 days after heading, white-based rice grains and white-back rice grains occurred in every position on the panicle. On the other hand, when kept under ventilation for 21-25 days after heading, milky white rice grains occurred on the primary rachis-branch at top and medium positions. The rate of chalky grains was high on inferior spikelets. The rate of chalky grains in rice could be estimated from the mean temperature from 0 to 20 days after heading and [(100-minimum humidity)×maximum wind velocity] from 6 to 25 days after heading. The occurrence of chalky grains varied with the cultivar.

【 授权许可】

Unknown