北海道での水稲湛水直播栽培の落水出芽法における播種後の気温による最適入水日の推定

日本作物学会紀事

田中 英彦¹  丹野 久¹ 

[1] 北海道立中央農業試験場

关键词: 過酸化石灰剤;    出芽;    推定法;    水稲;    湛水直播;    苗立ち;    落水期間;    Calcium peroxide;    Draining period;    Emergence;    Estimation model;    Paddy rice;    Seedling establishment;    Submerged direct-seeding;   

DOI  :  10.1626/jcs.85.282

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The optimal date of submergence after draining just after seeding of calcium peroxide (CAL)-coated seeds was estimated by two methods. The first was an accumulated effective temperature (AET) method, in which accumulated temperature was obtained by subtracting the basal temperature from the daily maximum-minimum average air temperature during the period from the day after seeding to the submergence. The coefficient of variation of AET was the smallest when the basal temperature was 6ºC. The AET at the optimal date was 85.9ºC. The second was a developmental index (DVI) method, which was given by integrating the developmental rate (DVR). The DVR was defined as follows, DVR=1/(1+exp(-A(T-Th)))/G, where T was the daily mean air temperature, and A, Th and G were the parameters. The optimal values of the parameters, A=0.1908, Th=16.06, and G=4.118, were estimated by the Simplex method. The root mean square error of the difference between the measured and estimated dates was 1.4 days by the AET method, and 1.2 days by the DVI method. Using these two methods, the establishment percentage without CAL coating was tested. It was 52.2% in standard draining and was significantly lower than that with CAL (70.9%) in standard draining. However, it increased to 60.9% when the draining period was prolonged for about three days. The optimal date of submergence without CAL coating was estimated to be the day when AET was 105ºC and when DVI exceeded 1.3.

【 授权许可】

Unknown