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近年来,上海郊区的棉花产量波动较大,1977～1982年五年平均亩产为皮棉113.8斤±30.7,其间最高的1978年平均亩产皮棉169斤,最低的1981年平均亩产皮棉84斤,相差一倍以上;高产县和低产县历年的产量差距为39.9～121.4％,是郊区栽培作物中产量高而不稳的典型。现就以下几方面谈点看法。 (一)产量演变和今后展望上海郊区,由于推广良种棉花,加强农田基本建设,改进耕作制度和栽培措施,于
In recent years, the output of cotton in the suburbs of Shanghai fluctuated greatly. From 1977 to 1982, the average yield per mu in five years was 113.8 kg ± 30.7, with the highest average output of 169 kg of lint in 1978 and the lowest average yield of lint in 1984 of 84 kg , A difference of more than doubled. The yield gap between high-yielding and low-yielding counties over the years was 39.9-121.4%, which is typical of the high and unstable output of cultivated crops in the suburbs. Now talk about the following aspects of the views. (I) Production Evolution and Future Prospects In the suburbs of Shanghai, due to the promotion of improved cotton varieties, strengthening of farmland infrastructures, improvement of farming systems and cultivation measures,