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上海地区改两熟制为三熟制后,曾经取得明显的增产效果。但在改制后进一步夺高产的过程中,又提出了不少有待进一步解决的问题。其中如早熟与高产的矛盾,同品种的选择和合理搭配都是需要解决的。从后季稻品种来看,当前不少地区应用的品种大都还是原来的单季晚稻类型。由于这些品种作后季稻时秧令长,占用秧田面积大,秧高又不适于机插,或者后期尚不耐低温,丰产性状
Shanghai cooked two-year system for the three cooked system, has achieved significant yield-increase effect. However, in the process of further winning high output after restructuring, many problems that need to be further resolved have been raised. Among them, such as the contradiction between early maturity and high yield, the same variety selection and reasonable collocation all need to be solved. From the later rice varieties, most of the varieties currently used in many areas are still the original single-season late rice types. As these varieties for the latter part of the rice seedling so that occupy a large area of seedling, seedling height is not suitable for machine inserted, or not resistant to low temperature late, high yield traits