Estimation of Heading Dates of Different Rice Cultivars under Dry Direct-Seeding Across Diverse Planting Dates

日本作物學會紀事

article

安本 知子¹  小島 誠¹  岡村 夏海¹  澤田 寛子¹  松㟢 守夫¹ 

[1] 農研機構中央農業研究センター

关键词: Cropping season;    Developmental stage;    Direct-seeding cultivation on well-drained paddy field;    Estimation of heading dates;    Prediction of developmental process;    Rice;    Transplanting cultivation.;   

DOI  :  10.1626/jcs.89.285

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to obtain basic knowledge for constructing a prediction model of direct-seeding cultivation on well-drained paddy field, we compared developmental stages for direct-seeding and transplanting among eight cultivars differing in maturity type from very early to mid-late including newly bred ones by the cropping season test in Tsukuba-Mirai City. Although accumulated temperature from direct-seeding or transplanting to ripening tended to decrease the later the planting date in both methods, the effect was large for mid-late maturing cultivars and small for very early maturing cultivars. The temperature in direct-seeding cultivation was higher and with larger year-to-year variability than in transplanting cultivation. This was considered to reflect the temperature during the raising of seedling period and the cultivation was easily affected by environmental factors in the early developmental stage. In the ripening stage, the difference in accumulated temperature with different planting dates was small in plants headed together, while the effects of weather factors, such as rain, and temperature drop, were large in both methods. Introduction of heading data into an existing heading date prediction model of transplanting cultivation revealed a significant correlation between the observed date and the estimated date. By improving the existing prediction model, it may be possible to estimate and predict the heading dates for direct-seeding cultivation. The findings help provide basic knowledge for constructing a prediction model and support introduction of direct-seeding cultivation to the current cultivation system.

【 授权许可】

Unknown