江汉平原优质米形成适宜栽培期初探

Preliminary study on the appropriate cultivating season of high-quality rice formation in Jianghan Plain.

采用近几十年来国内外关于优质米形成与气候条件关系研究取得的主要成果及江汉平原腹地荆州市1954～1999年的气象资料,以平均温度为主要影响因子,以水稻齐穗后15～20d为关键生育期对江汉平原水稻优质米形成的适宜栽培期初步研究结果表明,8月25日～9月初齐穗为江汉平原优质米形成的最佳栽培期,8月22日～9月5日左右齐穗为适宜栽培期,8月10日前与9月8日后齐穗为易灾栽培期。指出江汉平原优质米栽培中应重点抓好品种改良、土壤环境改良以及农田小气候改善等措施。

Appropriate cultivating season of high-quality rice formation in Jianghan Plain is analyzed by using the results on the relationship between the high-quality rice cultivation and the climatic conditions home and abroad, analyzing the climatic dates from 1954 to 1999 of Jingzhou that is situated in the center part of the Jianghan Plain. The mean temperature (T) is selected as the main factor, the growing period after 15-20d of heading is determined as the key period for high-quality rice formation. The main results show that the best cultivating season should be arranged to let the rice heading from the 25th Aug. to the start of Sept. , the appropriate cultivating season is heading from the 22nd Aug. to the 5th Sept. , approximately, the worst heading periods are the date before 10th Aug. and the date after 9th Sept. Moreover, the improvement in the variety, the soil and the microclimatic, however,will also be considerable factors in high quality rice production.