1987～1990年,10个早晚稻组合(品种),按五元二次正交旋转设计进行了试验和模拟分析,得出了综合优化方案。其中亩产超500kg的优化方案:早稻平均占总组成方案(3125套)的26.3％;晚稻平均占15.5％。由于方案发挥了综合效应,在近3年验证中表现出:“灾年少减产,常年能增产,丰年达高产”的良好效果。在亩产超500kg的基础上,早稻比对照增产8.3％～11.8％;晚稻增产6.7％～18.6％。因而,成为浙西南双季杂交稻亩产超吨粮的核心配套技术。设计条件下,早稻以亩栽丛数和本田N素施用量与产量关系最密切,晚稻以本田N素施用量与产量高低关系最大。 From 1987 to 1990, 10 early and late rice combinations (cultivars) were tested and simulated according to the quintuple quadratic orthogonal rotation design, and a comprehensive optimization plan was obtained. Among them, the optimization plan of over 500kg per mu is as follows: the average early rice accounts for 26.3% of the total composition (3125 sets); the average late rice accounts for 15.5%. As a result of the comprehensive effect of the program, the demonstration in the past three years shows that “the annual output can be increased during the disaster-reducing years, the annual output can be increased, and the high-yielding year can be achieved.” On the basis of over 500kg per mu, the yield of early rice was 8.3% ~ 11.8% higher than the control and the yield of late rice was 6.7% ~ 18.6%. Thus, a double-cropping hybrid rice per mu in southern Zhejiang over the core supporting technology. Under the condition of design, the relationship between the number of mu planted in the early rice and the N application rate and the yield of Honda was the most closely related. The N application rate in late rice had the highest correlation with the yield.