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上海郊区油菜产量较高,平均在250～300斤,但年际之间差异很大。如1982年全市亩产315斤,而1977年只有152斤,丰歉年变幅达163斤,高低相差一倍多。产量不稳的因素是多方面的。如冬前低温,春后多雨,秧田不足,毒素病蔓延,有机肥减少,土壤渍水等,这就需要采取趋利避害的有效措施,才能获得高产、稳产。现根据郊区实际情况和多年高产实践,提出以下建议。
Shanghai suburbs rapeseed yield higher, with an average of 250 to 300 pounds, but very different from year to year. For example, in 1982, the city produced 315 kg of mu per mu and only 152 kg in 1977, with an annual increase of 163 kg in abundance and a difference of more than double in height. The factors that contribute to instability are many. Such as low temperature before winter, rainy spring, lack of seedling, toxin disease spread, reduce organic fertilizer, soil water, etc., which requires effective measures to take advantage of disadvantages in order to obtain high yield and stable yield. Now based on the actual situation in the suburbs and years of high yielding practice, make the following recommendations.