“成单四号”是四川省农科院用俄亥43与矮广10自交系杂交育成的一个黄粒早熟单交种。自1976年引入我区试种,有较好的适应性。春种表现早熟(全生育期85—95天)、矮秆、高产、品质较好,生长整齐,空秆空苞少,结实性好,抗倒性较强,抗大小叶斑病,一般亩产700—800斤。适合我区双季稻地区晚稻秧田的前作。立春前后几天播种,6月5日左右收 “Cheng Dan No.4” is a yellow-ripened single cross breed cultivated by Sichuan Provincial Academy of Agricultural Sciences with the combination of Ohio 43 and Dwarf Guang 10 inbred lines. Since 1976, introduced into our region, there is better adaptability. Early spring performance of varieties (the whole growth period of 85-95 days), dwarf, high yield, good quality, tidy growth, empty stalk less bracts, strong, good lodging resistance, resistance to leaf spot disease, the general mu Production 700-800 pounds. Suitable for double cropping rice area in our region late rice seedling before. Sowing a few days before and after spring, June 5 or so