信阳地区是我省籼稻的主要产区。常年种稻约500万亩,占全省籼稻面积的90%。自试种推广杂交籼稻以来,发展迅速。但由于制种产量低,影响扩大种植。其主要问题是:制种田父母本的抽穗开花期处于7月下旬至8月上旬的高温期,使制种产量降低。几年来虽采取推迟生育期,躱避高温期的办法,但又因本区8月中下旬多阴雨天气,仍影响制种产量的提高。1983年5月中旬随 Xinyang region is the main producing areas of our province indica. Perennial rice about 5000000 acres, accounting for 90% of the province’s indica rice area. Since the introduction of hybrid indica hybrid rice, the rapid development. However, due to low seed production, affecting the expansion of planting. The main problems are as follows: The heading and flowering period of the parents of the farming system is in the high temperature period from late July to early August, which reduces the seed production. Although the past few years to postpone the growth period, avoid the high temperature approach, but because of the region in late August more cloudy and rainy weather, still affect the improvement of seed production. In mid-May 1983 with