At present, summer maize planting in the Huang-Huai-Hai area has been fully carried out. In most places, there have been different degrees of precipitation in recent days, and soil moisture is better, which is very beneficial for sowing and emergence of summer-sown corn. According to the characteristics of this year's climate, the Ministry of Agriculture's corn expert guidance group proposed to pay close attention to the recent weather changes, with the core of “grabbing the time to smash the fine volume of the live broadcast, and paying attention to the quality of the seedlings to achieve the four seedlingsâ€. The foundation of autumn grain production is laid.
First, according to local conditions, scientific selection. According to the regional climate characteristics and production conditions, the scientific variety layout. Maize varieties with appropriate maturity, disease resistance, high yield and stability, high yield and stability, fast dehydration, and quick dehydration, suitable for mechanized harvesting should be selected. On the basis of selecting excellent varieties, the germination rate is high, the vigor is strong, and the suitable one is suitable. High-quality seeds sown with grain size require a seed germination rate of ≥95%, and preferably a coated seed.
Second, grab the time to grab the robbery, mechanical fine broadcast. In order to improve the sowing quality of summer corn, wheat was harvested by a wheat combine harvester with a straw crushing and dispersing device, and the stubble height was controlled below 10 cm. After the wheat is harvested, it is necessary to grab the time and grab the smashing. The mechanical precision is posted on the live summer corn, and the row spacing is planted. The row spacing is 60 cm and the sowing depth is about 5 cm. The suitable sowing date of summer maize in the central and southern regions of Huanghuaihai is mid-June, and the northern area is mid-June, and the planting is completed before June 20. If the soil is not enough, if you want to fight for farming, you can plant it first, and then fill the “Mengtou Water†in time to make a full seedling. The round-trip disease re-issue area can adjust the sowing date according to the situation. There are about 4,500 mu seedlings, and the high-yield varieties with good density and high-yield fields with good fertilizer and water conditions can increase the density appropriately. According to the fixed amount of density, the number of seeds sown by precision should be 10%~15% more than the determined suitable seedling density.
Third, chemical weeding, pest control. After sowing, when the soil moisture is suitable or after pouring the “Mengtou Waterâ€, the herbicide is treated with 40% acetylated mixture or 48% butachlor, atrazine, 50% acetochlor, etc. . After the emergence of the corn, the herbicides such as 48% butachlor, atrazine or 4% nicosulfuron can be used for weeding after post-emergence. Do not spray, do not leak, and pay attention to medication safety. Before sowing, combined with soil closure, weeding and spraying of insecticide and ovicidal agents to kill residual pests such as the two-pointed moth, gray planthopper, thrips, and wheat straw fly on the wheat aphid.
Fourth, soil testing formula, balanced fertilization. The amount of fertilizer is determined according to the yield target and soil fertility, and scientific fertilization is carried out. Under the premise of returning wheat straw to the field, the production of summer corn should be based on nitrogen fertilizer, with a certain amount of potassium fertilizer (potassium sulfate), and apply appropriate amount of micro-fertilizer. Adopting the method of “one bottom and one chasingâ€, one-third of the nitrogen fertilizer and all the potassium fertilizer and micro-fertilizer are used as the base fertilizer in the side of the planting, and are separated from the seeds to prevent burning and burning.
5. Dry irrigation and rafting to promote seedling growth. If the soil moisture is insufficient at the time of sowing, it is necessary to timely fill the “Mengtou Water†after sowing. In case of rainstorms in the seedling period, it is necessary to drain in time to prevent buds and nurseries.
This article URL: Huanghuaihai summer corn planting and seedling management technical guidance
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