Prediction of Growth Stage by Nonparametric Evaluation of Temperature Response in Rice Plant

Japanese Journal of Crop Science

Sukeyuki ONO¹  Takashi KIRIYAMA¹  Eiji ISHIBASHI¹  Takamitsu KONNO¹  Yoshifumi TAMURA¹ 

关键词: Heading time;    温度影響;    Nonparametric DVR method;    出穂期;    Panicle formation stage;    水稲;    Prediction;    生育予測;    Rice;    ノンパラメトリックDVR法;    Temperature affection;    幼穂形成期;   

DOI  :  10.1626/jcs.59.443

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The temperature response in two growth phases of rice, namely, the transplanting time to the panicle formation stage and the panicle formation stage to the heading time was estimated according to the concept of the Developmental Index, using the Nonparamctric DVR method. Also, the prediction of the panicle formation stage and the heading time was attempted. The accuracy of prediction by the Nonparametric DVR method was compared with the Accumulative temperature method. Also the relationship between developmental rate and air temperature (DVR-T curve) obtained in Okayama Prefecture was compared with that in Ishikawa Prefecture. 1) The DVR-T curve showed characteristic shapes in each growth phase. In the period between the transplanting and the panicle formation stage, the DVR-T curve was bent; whereas it was on a straight line thereafter. 2) The differences in the days between the observed and estimated panicle formation stage or heading time were less than 2-3 days, when the Nonparametric DVR method was used in combination with the Cross validaion method. 3) When the DVR-T curve was on a straight line, the accuracy of the prediction did not differ from that obtained by the Accumulative temperature method. When the DVR-T curve was bent, the prediction by the Nonparametric DVR method was more accurate. 4) The DVR-T curves obtained in both prefectures gradually declined in increment as the temperature became higher than 2°C until the panicle formation stage, and thereafter the developmental rate became higher with the increment of air temperature.

【 授权许可】

Unknown