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

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.