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两年的试验结果表明,玉米、高粱杂交种种子纯度对其产量的影响是显著的。在规定的种子等级范围内,杂株率每增加1％,玉米减产32.3斤/亩。高粱减产24.3斤/亩。杂株类型的不同是杂株率影响产量高低的主要因素。一般杂株的单株生产力均明显低于杂交种典型株。两年的平均结果指出,玉米杂株比典型株单穗重低62.7％。高粱杂株比典型株单株低60.9％。但是,按杂交株率折算减产的数量显著低于实际减产的数量。这主要是由于一些外形上无法识别的“潜在杂株”造成的。杂交种典型株的单株生产力也随着纯度的下降而减产。因此,在杂交种种子生产中要减少亲本的繁殖世代,搞好防杂保纯工作。试验结果表明,我国现行的种子分级标准基本上是合理的,种子价格的级差应该适当增加,以促进更高纯度杂交种种子的生产。
The results of two years showed that the effect of seed purity of maize and sorghum hybrids on its yield was significant. Within the specified range of seed levels, corn yield was reduced by 32.3 kg / mu for every 1% increase in the plant-specific rate. Yield of sorghum 24.3 kg / mu. The type of heterosis is the main factor that affects the yield of hybrid plants. The general plant strains per plant productivity were significantly lower than the typical hybrid strains. The two-year average indicates that the maize hybrid strain is 62.7% lower than the typical single panicle strain. Sorghum hybrid strains lower than the typical single plant 60.9%. However, the number of yield reductions at the rate of hybrids was significantly lower than the actual number of cuttings. This is mainly due to the appearance of some unidentifiable “potential strains”. The typical plant productivity of hybrids also decreases with the decrease of purity. Therefore, in the production of hybrid seeds to reduce the reproduction of the parent generation, and do a good job in prevention and control of impurities. The test results show that the current standard of seed grading in our country is basically reasonable, and the difference in seed price should be appropriately increased to promote the production of seeds of higher purity hybrids.