Floral Impotency Due to Cool Weather in Paddy Rice Plants in the Early-season Culture Area : III. Effect of growth retardant on the reduction of necessary water depth in the deep irrigation method at the booting stage

Japanese Journal of Crop Science

Tomio WATANABE¹ 

关键词: Antiauxin;    IBP;    Cool-summer damage;    アンチオーキシン;    Growth retardant;    イナベンフィド;    ウニコナゾール;    Inabenfide;    障害型冷害;    Necessary water depth in deep irrigation method;    深水灌漑法での必要湛水深;    Paclobutrazol;    倒伏軽減剤;    Uniconazole.;    パクロブトラゾール.;   

DOI  :  10.1626/jcs.62.53

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

For the purpose of improving the deep irrigation method as a countermeasure of floral impotency due to cool weather by means of a reduction of the necessary water depth to protect young panicles, studies were conducted on the effect of growth retardants (Inabenfide, Uniconazole, Paclobutrazol) and a fungicide (IBP) on the height of young panicle and on sterility due to cool temperature at the booting stage. The results were as follows : (1) The height of the young panicles was reduced in every chemical treatment. The degree of reduction was greatest for lnabenfide, followed by Paclobutrazol, IBP, and Uniconazole. These reductions in the height of the young panicles were in agreement with the reduction of the peduncular internode and the next. (2) With the reduction in the height of the young panicles above the soil surface, the necessary water depth needed to cover about 80% of the cool-susceptible spikelets was reduced by about 6cm for lnabenfide, 4.5cm in Paclobutrazol, 3.5cm in IBP, 3.0cm in Uniconazole from the check, in which the necessary water depth was 22.5cm in the transplanting culture of young seedlings "Hatuboshi". (3) The treatments with the chemicals except IBP did not reduce significally the percentage of sterility due to 15°C constant temperature for 4 days at the booting stage in comparison with the check, in the pot experiment.

【 授权许可】

Unknown