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根据国家种子分级标准规定,粳稻中不得混有籼稻,而事实上当前使用的种子中,粳籼混杂较为普遍.近年来,我们对混杂原因作了一些调查与试验,看来除了操作中人为混杂原因外,连作茬口是一个重要环节. 一、晚粳稻混杂籼稻的原因晚粳种子中混杂籼谷,除了机械混杂外,重要的一个方面是前作的影响,前作早籼混入粳稻主要是两类: 1.早籼残留稻茬的再生结实.据我们在1978与1979年调查,早稻中无论是二九青、原丰早等早中熟品种,还是青秆黄、广陆矮4号等迟熟品种所残留的稻茬,均有再生能力,一般在8月下旬至9月上旬抽穗,9月下旬至10月上旬成熟.每亩残留茬
According to the national seed grading standards, indica rice should not be mixed in japonica rice, but in fact, japonica rice is more common in the currently used seeds.In recent years, we made some investigations and experiments on causes of confusion, and it seems that in addition to man-made mixed One of the important aspects of late japonica rice is mixed with indica rice, in addition to mechanical hybrid, an important aspect is the former influence, before the early indica mixed with japonica rice are mainly two types: 1. Early Indica residual stubble reproduce sturdy.According to our survey in 1978 and 1979, early rice regardless of two nine green, such as the original abundance of early maturing varieties such as green stalk yellow, Guanglu dwarf 4 late maturity Residues of rice stubble, have the ability to regenerate, usually in late August to early September heading, late September to early October mature stubble per acre