“双高型”产量结构是我县1983年提出的高产课题,即双季稻两季亩产均达到500公斤左右的产量,全年亩产过吨粮。目前我县双季稻尚有三种不同产量结构:一种是两季单产均已过500公斤左右的“双高型”产量结构;一种是一季单产为500公斤左右,另一季为300—400公斤的“互补型”产量结构;另一种是早、晚两季单产均为300—400百公斤或200—300公斤的“双低型”产量结构。为什么形成3种不同产量结构,主要是品种选择与布局不合理和栽培技术不当两个因素。为了实 The “double-high” yield structure is a high-yielding project put forward by our county in 1983, that is, the output of double-crop rice in both quarters reached about 500 kg per mu. At present, there are three different yield structures in double cropping rice in our county: one is a “double high” yield structure with yield of about 500 kg in each of the two seasons; the first is a yield of about 500 kg in one season and 300-400 in the other Kg of the “complementary” yield structure; the other is the early and late quarters each yield 300-400 kilograms or 200-300 kilograms of “double low” yield structure. Why the formation of three different yield structure, mainly the selection and layout of unreasonable varieties of cultivation techniques and improper two factors. In order to real