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一、引言杂交水稻是我国农业方面的一项重大发明,它为大幅度提高水稻产量开辟了新途径.由于我省淮河以南除高山地区外,双季稻生长所需的总热量条件是可以满足中.我省自1976年开始试种杂交水稻以来,杂交水稻面积逐年扩大,就单季杂交水稻而言,1984年已达425.8万亩,平均单产为991.9斤,如滁县等地典型田块单产超1200斤的屡见不鲜.但是我省气候对杂交水稻的生长发育,除早稻易受春季低温和晚稻易受秋季低温危害外,单季杂交水稻
I. INTRODUCTION Hybrid rice is a major invention in agriculture of our country and it opens up a new way for greatly increasing the yield of rice. Since the south of the Huaihe River in our province except the high mountainous area, the total caloric requirement for the growth of double cropping rice can be Met in 1976. Since the province began testing hybrid rice in 1976, the area of hybrid rice has been expanding year by year, for single-season hybrid rice, it reached 4 425.8 thousand mu in 1984 with an average yield of 991.9 kg, as in the typical fields such as Chu County Block yield super 1200 pounds is not uncommon, but the climate of hybrid rice in our province growth and development, except early rice susceptible to low temperatures in spring and late rice susceptible to low temperature damage in autumn, the single-season hybrid rice