The quality of corn hybrids directly affects the promotion of new varieties and the economic benefits of breeding units. In order to avoid the occurrence of seed quality accidents, the prevention of miscellaneous and pure products has become a key issue in the hybrid seed production process. To ensure the purity of the parental inbred lines: Use a reliable, high purity inbred line. Strictly eliminate impurities: at least three times during the seedling stage, jointing stage and tasseling stage. In the seedling stage, according to the characteristics of the inbred line, such as leaf color, leaf shape, and length are removed by combining seedlings to remove suspicious seedlings; jointing stage is based on the extension of the long phase and leaves combined with the growth potential to eliminate impurities; tasselling period is inherent to the inbred line. The typical traits are completely removed from the miscellaneous strains and inferior strains. After the mature ears are harvested, the panicles should be selected based on the grain color and ear type, and all the spikelets should be discarded. Securing safety: The isolation zone should be set up so that no other corn can be planted within 500 meters of the surrounding area. In the plain area, the isolation area should also be enlarged. There are difficulties in space isolation, and time isolation and barrier isolation can be adopted. If the isolation area has the same jade flowering period, the sowing date will be staggered for 40 days to reach the purpose of isolation. If the system is different from the field popping stage, the sowing date should be staggered for 40 days. Barrier isolation can be used for barriers of more than 3.5 meters such as villages, buildings, tall straw crops, etc. Maternal emasculation should be timely, thorough, and clean: timely, refers to the parental tassel immediately exposing the parietal when the powder has not yet been powdered; thoroughly, refers to all maternal tassels in the breeding area, and can not be omitted; clean, refers to the entire mother The tassels are removed and no residue is left. It is generally removed once a day during the tasseling period, and cannot be interrupted. The tassels to be removed should be taken out of the farming field and buried with soil to prevent the spread of loose powder. Artificially assisted pollination: Artificially assisted pollination at the end of flowering can increase the seed setting rate and increase yield. Care should be taken to collect the same combination of parent pollen to prevent mixing. Parents should separately store: Parents should be collected first and parents should be collected. Parents must be threshed separately, stored separately, air-dried and air-dried as soon as possible to facilitate storage; On behalf of the father of the seed production.
Sodium Nitrate,Potassium Nitrate,Strong Oxidizer
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