1. Selection of land selection (1) Selection of sweet corn can not be mixed with ordinary corn, must be isolated planting. It is required that the space isolation must be more than 400 meters (that is, no other corn varieties are planted within 400 meters of the planting area), and the time isolation requires that the flowering period differ by more than 30 days, staggering the sowing date. When selecting the land, choose sand or loam with flat terrain, fertile land, good permeability and good water retention, and the pH value is between 6.5 and 7.0. (2) The selection of sweet corn is divided into three types: sweet corn, super sweet corn and sweet corn. The local use of super sweet corn and enhanced sweet corn varieties. When planting, early, middle and late maturing varieties should be planted in stages, and seeds should be planted every 5 or 10 days. Suitable varieties for planting in the arid regions of Northwest China include Super Sweet No. 102 and Chaofeng Sweet No. 5.
2. Fine sowing (1) Sowing time The spring sowing temperature is around 12 °C, and it is planted in the middle and late April. (2) Seed treatment Before planting, the seeds are planted for 1 day, and then soaked with 0.2% potassium dihydrogen phosphate for 7 to 10 hours with water temperature of about 30 ° C. After the seed radicle breaks through the seed coat, it can be sown. (3) Seeding methods are planted according to local geographical characteristics and climate conditions. Before the sowing, the soil is finely ground, and the base fertilizer is applied. Generally, 1000-1500 kg of organic fertilizer is applied to the mu (the effect is better with human excrement or chicken manure), 40 to 50 kg of superphosphate, and the amount of grass and ash is appropriate. Seeding density of early-maturing varieties 4500-5000 acres, medium-maturing varieties and late-maturing varieties 3500 ~ 4500 plants acre, each spot on-demand 2 ~ 3, fine soil cover, cover soil 3 ~ 5 cm.
3. Field management (1) After seedling emergence, the seedlings should be checked in time. When the seedlings have 3 to 4 leaves, the seedlings are started, and when 4 to 5 leaves are to be planted, the seedlings are fixed. (2) Topdressing is topdressing in jointing stage and big horn period, that is, 15 kg of urea per mu in seedling jointing stage, and remedial measures such as partial fertilization and watering for weak seedlings; large horn period (about 50 days after sowing, When pinching the tassels by hand), apply urea 15 kg per mu. (3) Irrigation and drainage In the seedling stage, the soil moisture is controlled at 16-18%, the soil moisture before the jointing is controlled at 16%, and the soil moisture during the tasseling period is controlled at 18-22%, and then maintained at 18-20%. . (4) In addition to tillering at a higher density, tillers are basically unable to form ears, and generally only one ear is left per plant. (5) Pollination corn can be naturally pollinated. In case of special rainy weather or high temperature, artificial pollination should be carried out. The time is usually before 10:00 am, as long as the pollen is gently placed on the filament.
4. Pest control (1) Disease prevention and control Prevention and treatment of large and small spot disease with 400% gram sputum emulsion 500 ~ 1000 times liquid or 50% methyl thiophanate suspoem 500 ~ 800 times liquid leaf spray; in the jointing - tasseling stage of corn Stem rot, use nail cream copper or DT to spray according to the specified amount. Spraying time should be selected on sunny days, morning dew or 4 to 6 pm spray, prohibiting the use of high toxicity, high residual pesticides or "three" effect of the agent. (2) Insect pest control and prevention of sticky insects with 20% speed killing butyl milk 2000-3000 times liquid spray; control corn borer in the bell mouth period, use 50% sulfur phosphorus mixed with poisonous sand in the field; 73% for control of red spider Krut emulsifiable concentrate 1000 times liquid spray.
5. In the harvesting production practice, it is generally suitable to harvest the grain moisture content of 66% to 71% (milk ripening period). If it is processed for canning, it can be taken early for 1 to 2 days to sell fresh ear. It can be taken 1 to 2 days later, and the harvesting period is about 6 days.
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