After more than 20 years of practice in corn seed production, a complete set of seed production technologies has been gradually developed. The unit production has gradually increased from 150kg/667m2 to 350kg, and the yield of high-yield and high-yield fields has exceeded 500kg. Experience should mainly grasp ten key technologies. 1. Choosing a medium and high fertility field is the basis for the high yield of corn seed production The production of a high-level, flat land, convenient irrigation and drainage, and good fertility in desalting and drought irrigation can achieve full water seedlings, fast growth, and long growth, so as to fully realize the potential for yield increase. 2. Ensure that the isolation area is a prerequisite for ensuring purity The spatial isolation of different varieties of seed production shall not be less than 500m and no other corn can be planted in the isolation area to prevent cross-mixing between different varieties. 3, strictly wrong period sowing, to ensure the flowering period meet Raising the rate of pollination and seed setting is the key to the high yield of seed corn. The new-breeding and new-breeding varieties should adopt the three-step method of first flowering period trial, demonstration and re-promotion, and different varieties should adopt different parents' sowing date interval. In order to improve the insurance coefficient, the conventional production generally adopts two stages of paternal sowing. The first period of the parent's main encounter period accounted for 70% of the total number of the father's parent, the second period of the auxiliary meeting period accounted for 30l of the total number of the father's parent; For short varieties, three male parents can be used to ensure that the flowering period meets. 4, suitable for sowing Covering with mulch can be planted at the end of March. Appropriate early sowing can effectively avoid the high temperature and rainy weather in the middle and late July, which will help improve the pollen activity of the father, increase the fertilization rate, and extend the grouting time and increase the grain weight. 5, reasonable close planting In general, inbred lines have weak growth potential, low rate of double panicles, and poor potential for production per plant. Only by properly planting plants and giving full play to the production potential of the group, can the yield of seed production be improved. The general breed adopts a ratio of 1:7 for parents. The father density is 700-800/667m2, and the female density is 5500-6500/667m2. 6, rational management of fertilizer Maize needs a large amount of fertilizer, high-yield requires a lifetime investment of pure N25kg/667m2, P2O514kg/667m2. Two fertigation methods are generally used. Nitrogen fertilizers account for 40% of base fertilizer, 40% of panicle fertilizer, 10% for jointing balance fertilizer, and 10% for pellet fertilizer. 80% of phosphate fertilizer is used as base fertilizer, and 20% is used as panicle fertilizer. Pay attention to the combined application of fertilizer and water, especially the irrigation of the booting water, which is conducive to preventing high temperature, reducing the deterioration of small flowers, and improving the seed setting rate. At the same time pay attention to the middle and late foliar spray fertilizer, 667m2 with potassium dihydrogen phosphate 200-250g + high yield spirit (prime) 15ml, even spray 2-3 times, can significantly increase the grain weight, increase production. 7. Thoroughly decontaminating and ensuring field purity In the seedling period to tasseling before the 2-3 times to completely remove field hybrids and pubic plantlets, when the mother field around 30% of the burping requires 1-2 leaves to completely cast, can promote its early spinning 2-3 days are conducive to adjusting the flowering period, while reducing the ineffective nutrient consumption, promoting nutrient transfer to the grain and increasing the grain weight. In order to effectively prevent the male parent from mixing during the harvest, the method of thorough removal of the male parent after pollination is used to increase the purity of the hybrids, and the conditions for ventilation and light transmission can be improved; if it is desired to reduce the yield loss of the male parent, the father and the mother can receive the female parent first. This method ensures purity. 8, artificial and chemical combination to ensure the pollination rate In view of the susceptibility of the typhoon in July and August of my field, it is easy to use the lodging to reduce the yield of the typhoon. In the late stage of ear differentiation, we sprayed on the maternal mother with 20m1/667m2 foliar (water 20kg) to spray. , Strong resistance to fall and significantly increase pollination rate. At the same time, different artificial climate-assisted pollination measures for different climatic conditions and different species can effectively increase production. If the pollination season is accompanied by rain or a dwarf male cultivar, use the method of powder blowing or rope pulling in the morning at 8:00-11:00 am to increase the pollination rate, which is too long and tight for the female parent lobe. When the cultivar or female flowering stage is later than the male parent, the method of cutting the loquat leaves by the female parent is usually carried out to cut the top 23crn of the loquat leaves, so that the leaf filaments are in order to facilitate pollination. 9, disease prevention and pest control The method of combining seed dressing and control of growth period Pesticides is used to prevent pests and diseases. The use of Advilline 600g Shiwei Fu 350g mixed with 100kg species, can effectively control the seedling stage pests and diseases, the focus is to cut off the transmission of corn virus disease, and can also cure large and small leaf spot, increase production. In the corn trumpet period 667m2 with organic phosphorus pesticides 20m1 + chrysanthemum pesticides 30ml water 20-30kg, filling heart 2-3 times, can effectively prevent corn borer. 10, timely harvest The seed corn is harvested at the end of maturing wax. Strictly grasp the harvest, the father and mother of the collection of the sun, the mother to the scene to go to miscellaneous, timely drying, the ear eight days after the selection of sunny threshing, in order to ensure the germination rate and good commercial properties. 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Ten Key Technologies for Producing High Quality and High Yield of Corn