At present, the advent of corn sowing season, in order to improve the quality of sowing and lay a solid foundation for the late harvest, should focus on the following aspects of the work:
First, the scientific choice of improved varieties and improved varieties are the basis for high yields. Based on the local heat resources and production levels, the selection of varieties should be based on medium-early-maturing, high-yield and stable-seed products that are dense-dense, well-adapted, and comprehensively resistant. It is recommended that Zhengdan 958 and Yandan 20 be the main varieties. Such as soil fertility and high water and fertilizer plots can choose the outstanding high-yield Dandan 20, Daiyu 35 and other varieties, planting density control in the 3800 ~ 4500 strains; dry thin and low-lying land and fertile land and saline-alkali land should choose a wide adaptability Zheng Single 958, Gaoyou No. 1 and other varieties, planting density in the 4300 ~ 4800 strains.
Second, do a good job before sowing sun seed and pesticide seed dressing to improve the uniformity of seedlings, reduce the size of the seedlings caused by the size of the seedlings, seeding should be done before sowing, drying seeds, remove some small seeds, seedlings, and then choose In sunny weather, seeds will be laid on mats or cloths to be sun-tanned (bidding in brick fields and asphalt roads), so as to increase the germination potential and ensure that the seedlings are in order. In recent years, the occurrence of underground pests in corn fields has picked up. For the purchase of non-coated seeds, phoxim can be used as a seed dressing. In order to prevent the collapse caused by SBPH, imidacloprid should be added together. The seed dressing method is as follows: 40% phoxim 100 ml, 10% imidacloprid 20 g, 1 kg water, and 50 kg corn seed, mix and dry, and sow. Mixed insecticides and fungicides can be mixed and mixed in the pest and disease mixed area. However, attention should be paid to mixing insecticides and then disinfecting the fungicides. The stuffy stuffing can be stuffed for 4 to 6 hours, and then dried and sowed.
Third, when the time of early harvest sowing time early sowing can extend the growth period of corn, the effect of increasing yield is significant. Seek to complete the corn planting on the day of wheat harvest (ie, zero farmers) or the next day. In central Hebei, the sowing time of summer corn can not be later than June 20.
Fourth, improve the quality of sowing and improve the uniformity of the population to ensure that the seedlings are full, homogeneous, uniform and strong is an important means and key link for realizing high yield of corn. The main points should be grasped four points: First, when the wheat is harvested on the last crop, the wheat must be properly prepared. The mechanical cutting and throwing, wheat straw chopped length of less than 10 cm and evenly sprinkled on the surface, to prevent the accumulation of wheat straw. For plots with large field straw production, some straw should be removed manually under the premise of reducing stubble height. Second, vigorously popularize and select monocots for planters to ensure consistent seeding and achieve seedling uniformity. Miao Qi; The third is to achieve uniform sowing speed, speed control in 3 ~ 4 km / h, sowing depth of 3 to 5 cm, 1 to 2 per hole, so that a time sowing uniform, Qi, full, depth consistent do not leak Seeds; Fourth, a reasonable determination of line spacing, row spacing planting spacing of 60 to 70 cm (large and small rows of planting form, large row spacing 70 to 80 cm, small row spacing 30 to 40 cm).
V. Scientific Fertilization In recent years, with the planting of fertilizers, the area under the planting of maize has been expanding year by year. Because of the phenomenon of seed burning with planting fertilizers, there are frequent occurrences. For this reason, the following two points should be taken into consideration when planting fertilizers: 1 The selection of fertilizer varieties should be prudent; excellent slow-release fertilizers should be selected; the amount of mu should be about 30 kg; alternatively, diammonium phosphate and potassium chloride or potassium sulfate can also be selected. The amount of mu is 10 to 15 kg; if the use of ordinary compound fertilizer should not exceed 15 kg. It is best not to use urea as a seed fertilizer. 2 seed and fertilizer spacing must be more than 8 cm to prevent burning seedlings.
Six, timely watering after sowing, weeding before planting to contact the watering matters, ensure that 2 to 3 days after sowing, soaked in water, to prevent the phenomenon of bud emergence due to watering late. After the watering, the humidity in the field can be greatly reduced. Select 48% Ding A mixture or 42% Yihe mixture 125-170 ml/mu in time, spraying 30-45 kg of water, and add 100 ml of large grass in the field. Mu paraquat to achieve "a kill." In order to maintain the integrity of the film layer and improve the weeding effect, the field spray must be reversed and the water consumption per mu should not be less than 30 kg.
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