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贯彻《辽宁省农作物种子管理条例》问答（五）辽宁省种子管理站陶承光，崔光煜，王福才为什么主要农作物杂交种只能由县级以上国家种子公司生产？这是由农业生产计划性和杂交种子的特殊性决定的。以杂交玉米种为例，全国杂交玉米种的用量是一个相对常数；计划性很强。多了...
Q & A of Regulations on Crop Seed Management in Liaoning Province (5) Seed Management Station of Liaoning Province TAO Cheng-guang, CUI Guang-yu, WANG Fu-cai Why are hybrids of major crops only produced by national seed companies above the county level? This is determined by the particularities of planted and hybrid seeds of agricultural production. Taking hybrid corn species as an example, the amount of hybrid corn species in the country is a relative constant; the planning is very strong. too much...