The growth of summer corn is greatly influenced by climatic factors. It has entered the summer rainy season and is prone to causing corn lodging. Maize needs a large amount of fertilizer, pay attention to fertilization methods in different growth periods. In recent years, due to the large-scale promotion of hard-seeded sowing techniques, the use area and use amount of base fertilizer for summer corn is relatively small, so top-dressing is particularly important for increasing the level of summer corn production. To this end, we invite relevant experts to make suggestions for the reference of farmers' friends. 1 field management essentials Corn is an index high-yield food crop for many nutrients. How to scientifically balance fertilization according to the growth and development characteristics of wheat and summer maize and the law of fertilizer requirements, and effectively strengthen field management is a necessary guarantee for achieving high quality and high yield of summer corn. According to the growth characteristics of corn, it can be divided into three important stages: seedling stage, panicle stage and flowering stage. The most nitrogen absorbed by corn is in its life, potassium is the second, and phosphorus is the least. Roughly speaking, for every 100 kilograms of corn grain produced, 2.5-4.0 kg of pure nitrogen, 0.86-1.1 kg of pentoxide, and 3.0-5.5 kg of potassium need to be absorbed from the soil at a ratio of 1:0.4:1.3. 600-700 kg per mu need to apply 26-28 kg of pure nitrogen, 7-8 kg of phosphorus pentoxide, 8-10 kg of potassium oxide, 1 kg of zinc fertilizer. The “light-heavy-light†fertilization method is generally adopted. When sowing, 30%-40% of the total amount of nitrogen fertilizer and all phosphorus, potash and boron fertilizers are sown into the soil at intervals of 2 cm with the seeds; the second time in the corn 50% of the total amount of nitrogen fertilizer in the trumpet period is deeper in the soil, and the spike is increased; the third time, 10% of the remaining total nitrogen is applied in the silking stage of the corn to increase the leaf functional period and delay leaf senescence. Period, increase photosynthetic productivity, increase grain weight. Implementing chemical regulation During the 6-8 leaf bell stage of corn, 1 bag of 20 ml of Gao Yujin liquid agent or 30 ml of dwarfs per acre is used, and water is sprayed on the leaves to make the corn stalk thick and the root system developed. Reduce the plant height 20-30 cm, resist wind and lodging, increase production by more than 20%. The scientific prevention and control of pests and diseases of corn borer can be sprayed with 48% chlorpyrifos emulsifiable concentrate 30 ml 30 kg water 30 kg per mu, or spray the bell with 2.0% avermectin emulsifiable concentrate 3000 times, or The bell mouth was sprayed with 24.5% Greenhenge 101 Emulsion 1000 times. To control corn leaf spot and leaf rust, it can be used in the early stage of disease by spraying 12.5% ​​of wolfberry fruit wettable powder 800 times liquid and stem leaves, once in 5-7 days, and spray twice. After the sowing of corn, weeds are closed and weeded. We can use new and safe herbicides, such as Kosei and Jiujiu Red Emulsion, sprayed on the ground with water of 30-45 kg per acre (125 ml), and no harm to crops. If post-emergence weeding can be selected before the corn 5 leaves "Yu Jinchun", "Atrazine", "Nicosulfuron" and other corn seedlings efficient herbicides for chemical weeding. When the drought-resistant dredges encounter drought, they should be watered in time to meet the high water demand of corn. The foliar spray of highly effective nutritive and drought resistant agents regulates cell stomata, reduces water evaporation, supplements nutrients, and improves drought resistance. In the event of flooding, ditches and drains, reduces the water level in the field, reduces the risk of flooding, and ensures normal growth. Appropriate late harvest trials have shown that harvesting after the “breast†on the corn grain is completely disappeared can promote full ripening of the corn and further increase the yield and quality of the corn. The increase in yield per mu is generally 25-35 kg. (Wei Qiyong, Agricultural Technology Extension Center, Sheqi County, Henan Province) 2 management critical period Maize growth and development can be divided into seedling stage, jointing, booting, heading, grouting, maturing and other different periods. Before sowing, combined with site preparation of basal fertilizer; apply fertilizer when sowing; summer corn due to rush to broadcast and fertilization, should be supplemented at the seedling stage; big bell mouth period is the key period of dressing, if the thin seedlings can be advanced to the jointing stage or trumpet Oral administration. It is necessary to select high-quality, high-yield, density-tolerant, disease-resistant varieties; improve soil preparation and sowing quality; pay attention to the prevention of summer sorghum and lodging; combine different growth period characteristics to strengthen the prevention and control of pests and weeds. (Professor Wang Xingren, China Agricultural University) 3 clever fertilizer production Miao Fei is generally applied after the seedlings to the jointing stage. Miaomiao fertilizer and jointing fertilizer are combined for one application, which has the functions of promoting roots, strong seedlings, promoting leaves and strong stalks. In addition to the application of quick-acting nitrogen fertilizers, the seedlings may also be applied with both phosphate and potash fertilizers, as well as applied organic fertilizers. The jointing fertilizer for top-dressing joint-fertilizer is mainly nitrogen fertilizer, and can use 10-15 kilograms of urea furrow or hole application per acre to avoid topdressing before heavy rain to prevent it from being leached by rainwater. For fields with insufficient phosphorus and potassium fertilizers in the soil, three-element compound fertilizer can also be added to topdressing, which amounts to 7.5-10 kilograms per mu. The amount of panicle spike fertilizer should account for about 50% of the total amount of fertilizer, and the available nitrogen fertilizer is the main one. The appropriate period of application is in the spikelet and florets differentiation period, generally during the period of small bellmouth. In recent years, some places have attached great importance to the application of panicle fertilizer, but it should be noted that the application of panicle fertilizer is delayed and the production of panicle fertilizer is not fully utilized, and most of the farmers use panicle fertilizer only with insufficient amount of fertilizer. Late defermentation, premature aging of yellowing, growth of baldness, and a drop in grain weight. After fertilizing and pollinating the grain-fertilizer corn, the grain fertilizer can be properly applied to promote grain plumpness, reduce the length of baldness, and increase the yield and quality of corn. The main application of granular fertilizer is quick-acting nitrogen fertilizer, and 0.2% potassium dihydrogen phosphate solution can also be sprayed on the leaves. The amount of granular fertilizer accounts for about 5% of the total fertilizer use. Appropriate application of trace fertilizer to trace fertilizer can increase yield. Zinc fertilizer. The zinc sulfate solution can be sprayed at seedling stage, jointing stage, big bellmouth stage and heading stage, but the spraying effect is better at the seedling stage and jointing stage. Boron fertilizer. Boron fertilizer can be used as a base fertilizer, it can also be used for seed soaking. One-stop solution, one machine multi-test
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