我省淮北地区近几年来推广杂交水稻,增产效果显著,但也存在一些问题.主要是现有组合生育期偏长,影响种麦;大面积生产,穗数不足,空秕率较高;虫害防治不及时;因而未能充分发挥杂交水稻的增产潜力. 1977至1979年,我们对这些问题进行了初步探索. 一、组合选用当前淮北地区应用的杂交水稻有:汕优、南优、四优等几个系统.主要组合有:汕优三号、四优二号、南优二、三、六号.它们在阜阳地区作为麦茬稻种植,其特点是: 四优二号5月上旬播种,播种至齐穗100—105天,中旬播种95—97天,下旬 In Huaibei, the province has popularized the hybrid rice in recent years, and the yield increase effect is remarkable, but there are also some problems, mainly because the existing combination has a long growth period and affects the wheat variety; the large-scale production, the spike number is insufficient and the emptying rate is high; Prevention and treatment is not timely; and therefore failed to give full play to yield potential of hybrid rice .1977 to 1979, we conducted a preliminary exploration of these issues.First, the combination of the current selection of hybrid rice in Huaibei area are: Shanyou, Nanyou, four excellent Several systems. The main combinations are: Shanyou 3, Siyou 2, Nam You 2, 3, 6. They are in Fuyang region as stubble rice cultivation, which is characterized by: Siyou No. 2 sowing in early May, sowing To full heading 100-105 days, sowing mid 95-97 days, late