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几十年来,我国在种子生产中一直沿用“三年三圃制”繁种方法,这在过去历史条件下发挥过良好作用。但随着农业的发展和育种水平的提高,特别是我国由计划经济逐步走向市场经济,“三圃制”已不适应形势发展的需要,其主要弊端,一是周期长,有的品种按“三圃制”刚生产出来,该品种已经落伍;二是耗资大,每667m~2株行圃,比正常繁殖种子多投资200多元;三是品种易走样变形,由于各人选择标准不同,容易把品种性状选偏;四是缺乏种子生产整体性,从育种者种子开始繁殖到生产出大田用种为止,是种子生产的全过程,其
For decades, our country has been following the “three-year plan” system for seed production, which played a good role in past historical conditions. However, with the development of agriculture and the improvement of breeding standards, especially the gradual transition from a planned economy to a market economy in our country, the “three-pu system” has not met the needs of the development of the situation. The main drawbacks are the long cycle and some varieties Second, it is expensive, every 667m ~ 2 rows of nursery, more than the normal breeding seed investment more than 200 yuan; Third, the variety is easy to take the kind of deformation, due to the choice of each Different standards, easy to choose the characteristics of partial varieties; Fourth, the lack of seed production integrity, from breeder seed to breed to produce the field use of so far is the whole process of seed production, and its