Zhengdan 958 is a new maize variety with high yield, stable yield, high quality, multi-resistance and wide adaptability developed by the Crops of Henan Academy of Agricultural Sciences. It was participated in the regional trials, production trials, and national Huanghuaihai regional trial in Henan province from 1997 to 1999. Made six consecutive championships. Has been approved by Henan, Shandong, Hebei and national varieties. In 1999 and 2000, we conducted a research on super-high yield cultivation of this variety. In 2001 and 2002, a large-scale promotion experiment was conducted. The mu yield exceeded the 750kg level. The main cultivation techniques are now described below. First, fertilize the fertility, Shisan 958 is a compact medium-ear corn variety, and the super high-yield cultivation is achieved with a higher density and an increase of the photosynthetic area per unit area. Therefore, it has a higher requirement for soil fertility. With high fertility as the guarantee, we should pay special attention to increasing organic fertilizer to make the soil organic matter content above 1.3%, total nitrogen 0.14%, total phosphorus 0.18%, available nitrogen 80mg/kg, available phosphorus 25mg/kg, and quick-acting potassium 120mg/ More than kg. The suitable amount of basal fertilizer was 3-4 m3 of organic manure per mus, urea l0 kg, 20 kg of phosphoric acid, and 15 kg of potassium sulfate. Basal fertilizer should be applied when ploughing land preparations. If intercropping or robbing live, it should be applied when the cultivator breaks. Second, timely sowing, reasonable planting corn interplanting can meet the requirements of accumulated temperature, ease the tension of the wheat harvest labor tension, but often due to poor interplanting quality, wheat harvest mechanical rolling, pest damage, etc., and there is a lack of seedlings off the ridge and the size of seedlings, The output has a great influence. In production, sandy and loam soils can be planted before planting, and sowed 7 to 10 days before wheat harvest. When the wheat is harvested, the seedlings are one leaf and they are not susceptible to mechanical damage; the clay field can be planted 3-5 days before the wheat harvest. Watering in time can guarantee full broadcast of seedlings. The sooner the wheat is harvested, robbed or planted after sowing, the sooner the better, and at the latest no later than June 15. Otherwise, it will affect the yield due to the unfavorable conditions of autumn low temperature, or affect the proper sowing of wheat due to late maturity. The experiment showed that the suitable planting density for Zhengdan 958 cultivation in super high yield was 5500-16000 per mu. The wide and narrow rows were planted with a width of 70 to 80 cm, a narrow row of 40 cm, a plant spacing of 18 to 22 cm, a sowing depth of 3 to 4 cm and 3 per hole. III. Strengthening field management Zhengdan 958 requires high-density cultivation, so the competition between plants and individuals is further aggravated. Therefore, the key to field management is to promote the balanced growth of individuals. This is an important guarantee for super-high yield. For interplanting or robbery live seedlings, basal fertilization should be applied as early as possible, 3 seedlings, 5 seedlings, and seedlings should be kept in seedlings. In seedlings, seedlings of the same size should be kept in adjacent plants to ensure seedling density. . 8 leaf stage (pulling period) Mushi stalk urea fertilizer 15kg> 12 leaf stage (big bell stage) applied panicle fertilizer 25kg, when combined with watering fertilizer. In the seedling stage, tasselling to filling period in case of drought must be watered to ensure high yields. Fourth, timely control of pests and diseases when corn sowing, with 60% phorate or 50% phoxim 800 times mixed with fine sand made of toxic soil and sowed into the sowing row or sowing hole, can control underground tigers and earthworms and other underground pests , guaranteed to broadcast a full seedling. Before the weeds are unearthed and watered, or when the ground is wetted after rainfall, the mu is treated with a 40% B corn corn herbicide 0.2-0.3 kg for soil closure to prevent weed damage. In the seedling stage, 50% phoxim 1500 times liquid spray was used to control armyworm. During the big bell mouth period, mu was used in the heart of the bamboo shoots, and the corn borer was also used to treat aphids. 5. The live stalks of Zhengdan 958 will be matured in a proper period. When fully matured, the dry weight of grains will be the largest and the yield will be the highest. The criterion for proper harvesting is that 50% of the grains in the middle of the ear disappear. Generally about 10 days after the yellow leaves turn yellow.
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