1. Selecting the selected land (1) The sweet corn in the selected place cannot be mixed with ordinary corn, and must be planted in isolation. It is required that the spatial isolation must be more than 400 meters (that is, no other maize varieties should be planted within 400 meters of the planting area), and the time isolation requires a difference of 30 days or more between the flowering period and staggered sowing time. When choosing the land, choose sandy soil or loam with flat terrain, fertile soil, good permeability, and good water retention, with a pH of 6.5-7.0. (2) The sweet corn varieties were divided into three types: sweet corn, super sweet corn and sweetened corn. Super sweet corn and sweet corn varieties were selected locally. When planting, early, middle and late-maturing varieties should be planted in different stages and sowed every 5 days or 10 days. Appropriate varieties for cultivation in the northwest arid regions include Chaotian No. 102 and Chaofengtian No. 5 varieties.
2. Fine sowing (1) sowing time spring sowing temperature is appropriate around 12 °C, sowing in late April. (2) Seed treatment Sowing before planting for 1 day, then soaking in water at a temperature of about 30°C and 0.2% potassium dihydrogen phosphate for 7 to 10 hours until the seed radicles break through the seed coat to sow. (3) Seed sowing according to local geographical characteristics and climate conditions. Fine preparation before sowing, adequate base fertilizer, general Mushi organic fertilizer 1000 to 1500 kilograms (to human urine or chicken manure better), superphosphate 40 to 50 kilograms, grass and wood ash amount. Planting density of early-maturing varieties of 4500-5000 acres, medium-maturing varieties and late-maturing varieties of 3500-4500 acres, 2-3 seeds per hole, seed cover, soil cover 3 to 5 cm.
3. Field management (1) After the emergence of seedlings between seedlings, the seedlings should be checked in time. When the seedlings are 3 to 4 leaves, the seedlings are started, and 4 to 5 leaves are to be seedlings. (2) Dressing fertilizers are topdressing at the jointing stage and the big horn stage, that is, 15 kg of urea per mu after the jointing stage of the seedlings, and some remedial measures such as partial fertilization and watering for weak seedlings; big horn period (about 50 days after sowing, can When the tassels are squeezed by hand, topdressing urea is 15 kg per mu. (3) Irrigation and Drainage Corn requires soil moisture to be controlled at 16-18% at the seedling stage, and soil moisture before jointing is controlled at about 16%. The soil moisture in the tasselling stage is controlled at 18-22%, and then remains at 18-20%. . (4) In addition to tillers at higher densities, the tillers are basically unable to form ear, and usually only one ear per plant. (5) Pollination corn can be naturally pollinated. In case of special weather such as continuous rainy days or high temperatures, artificial pollination should be conducted. The time is usually before 10:00 am, as long as the pollen is gently placed on the filaments.
4. Disease and pest control (1) Disease prevention and control Prevention and treatment of leaf spot use 400% Keyu San Emulsion 500 to 1000 times solution or 50% Thiophanate Suspension Emulsion 500 to 800 times foliar spray; Prevention and control during corn jointing and tasselling Stalk rot, use a cream of copper or DT spray according to the prescribed amount. The spraying time should be selected after the sunny morning dew dry or spray at 4-6 pm, the use of highly toxic, high-residual pesticides or "triple" effect of the agent is prohibited. (2) Insect pest control The control of stickworms uses 20% quick-killing chlorinated dilute 2000 to 3000 times spray; in the bell stage control of corn borer, spread with 50% phosphoric acid sand in the field; 73% for control of red spiders Chrysanthemum EC 1000 times spray.
5. In harvesting production practice, generally the grain moisture content is 66% to 71% (milk ripening period) suitable for harvesting, if the purpose of processing canned food can be harvested 1 to 2 days earlier, mainly selling fresh ear Can be late to receive 1 to 2 days, harvesting period of about 6 days.
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