My field is Jiangsu Dahua Seed Production Corn Breeding Base. After more than 20 years of practice in corn seed production, a complete set of seed production technology has been gradually concluded. The unit production has gradually increased from 150kg/667m2 to 350kg, and the yield of high-yield and high-yield fields has exceeded 500kg. The successful experience should mainly grasp ten key technologies. 1 The selection of medium and high fertility fields is a high-yielding, high-yielding, high-yielding field. The choice of high-yielding and high-yielding, high-level, flat, easy-to-irrigation, fertility-friendly, desalting, drought-fed cornices can achieve a full-water seedling and a long-lasting growth. Fully increase production potential. 2 Ensure that the isolation zone is the premise of ensuring purity The space isolation of different varieties of seed production shall not be less than 500m. Furthermore, other corn may not be planted in the isolation zone to prevent cross-mixing between different varieties. 3 Strictly wrong sowing, ensuring that the flowering period meets to improve pollination rate is the key to the high yield of the corn planted. 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 Proper sowing can be planted with plastic film covering 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 prolong the grouting time. Grain weight. 5 Reasonable dense planting General inbred lines have weak growth potential, low rate of double panicles, and low potential for production per plant. Only by properly planting plants and giving full play to the productive 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 A reasonable amount of fertilized corn is needed for reasonable fertilization. High-yield requires pure N 25kg/667m2 and P2O514kg/667m2 for life. 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, we must pay attention to the mid-and late-stage foliar spray, 667m2 with potassium dihydrogen phosphate 200-250g + high yield spirit (prime) 15ml, even spray 2-3 times, can significantly increase the weight, increase production. 7 Thoroughly detacusing and ensuring that the purity of the field is thoroughly removed from the field 2-3 times before the seedling stage to the tasselling. When the mother field is about 30% burping, it is required to bring 1-2 leaves. Thorough detasseling promotes early spit silking for 2-3 days, which is conducive to regulating flowering time. It can also reduce ineffective nutrient consumption, promote nutrient transfer to grains, and increase 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 Combining artificial and chemical fertilizers to ensure that the pollination rate is based on the characteristics of vulnerable to typhoon invasion in July and August of my field, and adopts the method of spraying corn sorghum 20m1/667m2 at the end of the seed ear differentiation stage. Water spraying (20kg) on ​​the leaf surface has the effect of reducing height, preventing strong stems, and significantly increasing the 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, you can use the method of spraying the powder on the mister or pulling the rope on the way from 8:00 am to 11:00 am to increase the pollination rate. 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 Prevention and pest control adopts the method of combining seed dressing with the control of the growth period and the prevention of 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 corn horn period 667m2 with organic phosphorus pesticides 20m1 + chrysanthemum pesticides 30ml water 20-30kg, filling heart 2-3 times, can effectively control corn borer. 10 Timely harvesting of seed corn at the end of maternal wax maturing, timely harvesting. 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.
Imported Bio-based Plastic Additives
Plastic additives, also known as plastic additives, are compounds that must be added to polymers (synthetic resins) to improve their processing properties or to improve the properties of the resin itself. For example, in order to reduce the molding temperature of PVC resin, to make the product soft and added plasticizer; Another example is to add foaming agent in order to prepare light weight, anti - vibration, heat insulation, sound insulation foam plastics; The thermal decomposition temperature of some plastics is very close to the molding temperature, and the molding cannot be done without adding heat stabilizer. Therefore, the plastic assistant agent occupies a particularly important position in the plastic forming process. A class of auxiliary agents for plastic molding products, including plasticizer, heat stabilizer, antioxidant, light stabilizer, flame retardant, foaming agent, antistatic agent, mildew agent, colorant and whitening agent (see pigment), filler, coupling agent, lubricant, mold release agent and so on. Colorants, brighteners and fillers are not special plastics chemicals, but the general use of materials.
Imported Bio-Based Plastic Additives,Hobum Elo Plasticizer,Arkema Elo Plasticizer,Polar Elo Plasticizer
Xingbang High Molecular Materials Co., Ltd. , https://www.chemicaladditive.com