I. Strengthen irrigation
Watering seedlings in a timely manner to promote Miao whole, Miao Qi. Skillful irrigation and water saving ensure the rapid growth of corn roots, stems and leaves. Flowering stage and filling stage are the peak period of water requirement during corn life, and it is also a critical period for high yield. To ensure the demand of corn for water, effectively increase the number of grains per spike, prevent empty stalks and baldness, and increase the grain weight of corn, it should be timely irrigated.
Second, check seedlings between Dingmiao
Increasing the planting density is an important measure to achieve high yields in maize. The appropriate density, time seedlings, and seedlings should be determined based on the characteristics of the varieties and the level of soil fertility to ensure planting density. After the seedlings are seeded, the two seedlings are kept in the nearest place in the same line or in the neighboring line to prepare for early seedling replacement. During the period of 3 leaves, seedlings, 5-6 leaf visible leaves (4-5 unfolded leaves) were seedlings, weak seedlings, diseased seedlings, insect seedlings were removed, strong seedlings, seedlings, seedlings were kept, and the uniformity of the group was improved. For density-tolerant varieties (Zhengdan 958, Saitama 18, Yandan 18, Zhongke 11 etc.) and high-yield plots, the suitable density of seedlings is about 4000-4500 strains per acre, and for thin-planted varieties (Saiyu 16 , Shandan No.9, Xianyu 335, etc.) and poor land plots, suitable for seedling density of 3800-4000 strains per mu is appropriate.
Third, scientific fertilization
In addition to basic fertilizer, based on nitrogen fertilizer, pay attention to increase phosphorus and potassium fertilizer and trace fertilizer, phosphorus and potassium fertilizer should be a one-time basis. The target production of 600 kg/mu of corn field needs of nitrogen, phosphorus and potassium are 15, 6 and 8 kg/mu respectively; the target production of 500 kg/mu of corn field has nitrogen, phosphorus and potassium requirements of 13, 5, and 6 kg respectively. mu. Nitrogen fertilizers should adhere to the principle of light Miaofei, heavy horn fertilization, and supplementation of flower granules. During the jointing stage, 5-10 kilograms of urea and total phosphorus and potassium fertilizers are applied along the lines to deepen the furrow (15-20 cm) to strengthen the roots and strengthen the seedlings; 10-15 kilograms of urea are applied to the big bell-mouth stage to promote the panicles and grains; grain During the grain filling stage, topdressing urea by 5-10 kg was used to increase the photosynthetic capacity of the leaves and increase the grain weight.
Fourth, chemical weeding
For plots with better soil moisture, 40% EtOH mixture 200-250 ml can be directly sprayed on each acre for closed spray; for soils with poor soil moisture, 3-5 leaves and weeds on corn seedlings can be used. In the 2-5 leaf stage, spraying with 4% jade Nong fungicide (Nicosulfuron) in 100 ml of water and 50 liters of water per acre can also be used in combination with cultivator for weeding.
V. Pest Control
Focus on the prevention and control of major pests and diseases such as armyworm, corn borer, head smut, and large and small leaf spot diseases. Mythimna separata is bred by larvae and eats all the leaves from the larvae. Only the bare stems are left, and 90% of the solid trichlorfon or 2000-500 times of the chrysanthemum-pesticides are used to spray the pests before the emergence of the seedlings. . Corn borer is the main insect pest during the ear period, with 250 grams of 3% phoxim granules mixed with 5-6 kilograms of fine soil, sprinkled in the leaves of corn leaves or leafhoppers, tassel leaves and ear. Head smut is mainly sprayed with a 800-fold carbendazim solution. Large and small leaf spot was sprayed with 50% carbendazim or 50% tetrazine or 70% thiophanate 500 times, spraying once every 5-7 days, and spraying 2-3 times.
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