Land selection, selection and ploughing
Select fertile landfills such as soybeans, wheat, potatoes, or corn that have a flat topography, deep plowing layer, high fertility, good water and fertilizer retention performance, and convenient drainage and irrigation. The soil cultivation system based on deep looseness, loose soil, tumbling soil, and hoe soil is applied and deep-seated for three years. Plowing depth 20 to 23 cm, so that the standardization of land preparation.
Variety Selection and Seed Treatment According to the ecological conditions, the high-quality, adaptable and pest-resistant varieties with the potential of 600-800 kilograms per mu approved by the state or Heilongjiang Province are selected, and the germination rate is over 90%. Live cultivation of the selected breeding period activities accumulated temperature less than the local constant temperature accumulated product temperature 100 ~ 150 °C varieties. Pregermination and chemical treatment before sowing.
Seeding sowing date: 5~10 cm tillage ground temperature stable through 7~8°C when sowing seeds. The first accumulated temperature zone is planted before and after April 25th and May 1st; the second accumulated temperature zone is planted before and after May 1st and May 5th. Planting methods: The standard small ridges of 65 cm or 70 cm are used, and new dense-resistant corn varieties are selected, with a density of 3500-3800 plants/mu. Seeding method: According to the planting density requirements, artificial sowing and mechanical precision sowing. Sowing requires consistent seeding and even soiling. Immediately after sowing, the live plots were repressed; after sitting, the water species were sown and repressed the next day. Do not leak the pressure during the crackdown, do not drag, cover the depth of 3 to 4 cm. Seeding capacity: According to the seed germination rate, planting density requirements, etc., determine the seeding rate. Slaughter in hectare = hectare of seedlings 100 grams weight (grams)/degree of clarity (%) Germination rate (%) 105 {1 + field loss rate (%)}. The field loss rate is calculated as 10%.
The fertilization uses 30-40 tons/ha of organic fertilizer containing more than 8% organic matter, combined with site preparation or application of fertilizer. Application of urea 300 kg / ha, of which 35% urea as base fertilizer or seed fertilizer, another 65% top dressing. Apply 300 kg of diammonium phosphate, 90 kg of potassium fertilizer and 7.5 kg of zinc fertilizer as base fertilizer or seed fertilizer per hectare. Corn dressing is carried out before the 7th to the 9th leaf stage or before the jointing stage. The top dressing area is 10 to 15 cm from the plant and the depth is 8 to 10 cm. According to the growth of corn, the foliar dressing can be carried out later.
Field management Chemical weed control can be selected by pre-emergence weeding, post-emergence weeding and other methods to ensure safety and facilitate crop growth.
Zha Tian reseeding or transplanting: If the seedlings are lacking after emergence, they must make use of the reserve seedlings or field surplus seedlings to make supplementary watering or transplanting. When 3 to 4 leaves, weak seedlings, diseased seedlings, and seedlings should be removed and an equal distance seedling should be established.
Shovel before the shovel and shovel in time: after the emergence of the shovel before the deep loose or shovel a plow before the shovel. If chemical herbicides are not used, shovel spade every 10 to 12 days after spade treatment to achieve three spades and three spades;
Irrigation: In case of drought during corn jointing and tasselling, the irrigation should be timely.
Other management: Before and after the jointing period, remove the childbirth early and avoid damaging the main stem when going to bed. In August and mid-August, we took the grass 1 or 2 times; the corn wax was cooked at the end of ripening.
Pest control: The prevention and control of armyworm and corn borer can be controlled with pyrethroid pesticides and Beauveria bassiana powder in due course. The control of large leaf spot can be from jointing stage to tasselling stage (late June to mid-July). 75% chlorothalonil wettable powder 400 to 500 times solution, or 50% oxymidum 300 to 500 should be used in time. The liquid spray is sprayed at intervals of 7 to 10 days and sprays 2 to 3 times continuously.
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