How to manage planting corn?

How to manage planting corn? Please introduce in detail that planting corn can be managed with reference to the following methods: first, to increase planting density is an important measure to achieve high yield of maize. It is necessary to determine the suitable density according to the characteristics of varieties and the level of soil fertility, and to ensure the planting density. Generally check the seedlings immediately after emergence, and leave two plants nearby in the same line or adjacent lines in order to replenish the seedlings as soon as possible. During the period of 3 leaves, 5-6 visible leaves (4-5 unfolded leaves), the seedlings were fixed, weak seedlings, diseased seedlings and insect seedlings were removed, strong seedlings, uniform seedlings and uniform seedlings were left, and the population uniformity was improved. For density-tolerant varieties and high-yield fields, the suitable seedling density is about 4500 plants per mu, and for sparse planting varieties and poor soil fertility, the suitable seedling density is about 3500 plants per mu. Second, scientific fertilization should be balanced according to the yield target and soil fertility level of maize in different places. On the basis of the application of sufficient base fertilizer in the previous winter wheat, we should mainly apply chemical fertilizer (urea), pay attention to increase phosphorus and potassium fertilizer and micro-fertilizer, and phosphorus and potassium fertilizer should be applied at one time. The application of nitrogen fertilizer should adhere to the principles of light application of seedling fertilizer, heavy application of big trumpet fertilizer and topdressing fertilizer. At jointing stage, nitrogen fertilizer (15-20 cm) was deeply applied along one side of the seedling, accounting for about 30% of the total nitrogen fertilizer, in order to promote root and seedling. In the big trumpet mouth stage, about 50% of the total nitrogen was applied to promote large panicles and grains, and attention should be paid to deep application and combined with topdressing for intermediate ploughing and weeding. During the grain filling stage, 20% of the total nitrogen was applied to improve the photosynthetic capacity of leaves and increase grain weight. Third, rational irrigation according to the law of corn water demand and soil moisture, grasp the best irrigation period and supply water in time. After jointing, maize roots, stems and leaves accelerate growth and enter the stage of female and male ear differentiation, and the field soil water capacity should be kept at 65-75%. The flowering stage is the peak period of water demand in the corn life, which requires that the water content in the 1-meter soil layer is not less than 70% of the field capacity. The filling stage is the key period for yield formation. It is necessary to ensure the water demand of maize, effectively increase the number of grains per ear, prevent empty stalk and bald tip, and increase the 1000-grain weight of maize. In addition to the seedling stage, when the field capacity of each growth period is less than 60%, it should be irrigated in time. Fourth, to control weeds on plots that are better for soil moisture, you can directly spray 40% ethyl A mixture 200-250 ml per mu, or use 33% pendimethalin (Shitianbu) EC 100ml plus 72% Dur EC 75ml mixed with 50 liters of water per mu for closed spray. For plots with poor soil moisture, 4% Yunongle suspension agent (nicosulfuron) 100 ml / mu can be sprayed with 50 liters of water at 3-5 leaves of corn seedlings and 2-5 leaves of weeds per mu, or 20% paraquat (gram Wuzhen) water agent can be sprayed with 50 liters of water in the 7-8 leaf stage of corn, or weeding can be combined with intertillage. Fifth, chemical control and lodging prevention, especially in the middle and later stage, is an important factor affecting maize yield. On the basis of selecting varieties with high density resistance and lodging resistance, it is necessary to cultivate the soil in time and control it in time to prevent lodging. For plots with excessive density and serious lodging risk, 50% Daizhuangsu water agent 200 times can be sprayed before booting to enhance plant lodging resistance and improve population ventilation and light transmission conditions. 6. on the basis of selecting disease-resistant varieties and seed coating, attention should be paid to the prediction, prediction and control of diseases and insect pests in the middle and later stages. We should focus on the prevention and control of major diseases and insect pests such as corn borer, aphids and rough shrinkage disease, so as to minimize the loss of corn yield. Click to get more corn planting techniques click to get more food crop planting techniques