First, transplant seedlings and sow them early in time.
According to the climate characteristics, it must be planted in greenhouse before it can be listed in early June, and the sowing date should be earlier. It is required to sow in early February and transplant before the end of February. The seedlings were cultivated in an arched shed covered with nylon film in the greenhouse. The seedbed should be properly dry, not too wet, so as to avoid seed rot. The seedbed should use nutrient soil, apply decomposed human excrement and urine in advance, and plow in the topsoil for later use. When raising seedlings, use a little calcium magnesium phosphate fertilizer, cover the soil 2 cm deep, cover it with plastic film, and then arch the shed. Remove the plastic film when the seedlings emerge, and ventilate the seedlings one week before transplanting.
Second, soil preparation and soil preparation for transplanting greenhouse
The greenhouse is covered with plastic film for cultivation, with two rows of one side, the side width is 80cm and the ditch width is 50cm. Before border tillage, a small ditch with a depth of 10cm was opened in the middle, and organic fertilizer (farmyard manure) and chemical fertilizer, 30kg ammonium bicarbonate, 20kg calcium superphosphate and potassium chloride 10kg were applied, and seedlings were transplanted on both sides. Before film mulching, the soil should have enough moisture; Therefore, when the soil moisture is suitable after ploughing, immediately prepare the soil and cover it with plastic film. Spraying herbicide before film mulching can resist death. Be sure to wait for the seedlings to transplant first.
Third, transplanting is reasonable and close planting
When the seedlings grow to the fourth leaf, move them into the production greenhouse in time, and be sure to ventilate the seedlings before transplanting. The plot requires 3300~3500 plants per mu. Too dense will affect the appearance of ear, and the bald tip and spikelet will increase. The cultivation adopts large and small rows, the spacing between large rows is 80cm, the spacing between small rows is 50cm (large rows in the ditch and small rows in the border), and the spacing between plants is 30cm. When transplanting, it is necessary to pour enough root-fixing water, add 15ml phoxim to control cutworms, and use a proper amount of calcium magnesium phosphate fertilizer when transplanting, and do not use other fertilizers.
Fourth, on-site management
After transplanting (after planting 1 week), when the seedlings are happy, apply 10- 15 kg of imported compound fertilizer at the edge of the seedlings (3-4 cm away from the seedlings). Never touch the seedlings. Cover the plastic film mouth with soil and spray herbicides in the ditch. Sweet corn will grow tillers in the middle growth stage. Remove the tillers below in time, and do not remove the branches above, so as not to damage the leaves and stems. The fertilizer for tapping at the late jointing stage is 20kg urea and compound fertilizer 10kg. Sweet corn varieties have many ears, 3-4 ears will grow in the middle of the stem, and tillering and spinning will begin in the later stage. One spike must be left at the top of each plant, and the spikelets below must be removed in time. After spinning, the spikelets should be removed 1 day, which can be used as corn shoots. Generally, after pollination, the top tassel is removed and 1-2 leaves are brought. It can reduce plant height, increase ventilation and light transmission, and improve yield.
Five, pest control
Pay attention to the prevention and control of cutworms and crickets at seedling stage. Water phoxim once when transplanting. In the later stage, corn borer should be mainly controlled, low-toxic biological pesticides should be used to fill the heart of corn at the big horn stage, and low-toxic biological pesticides, such as Regent, should be sprayed at the end of spinning. It is forbidden to use pesticide residues such as methamidophos, carbofuran and dichlorvos. At present, agricultural products have to go through pesticide residue detection when they enter the market. If it exceeds the standard, it will not be listed, and all reports will be handled, causing losses.
Six, timely harvesting
Whether the harvest is timely or not directly affects the quality and yield of sweet corn. Generally, it should be harvested when the filaments of the ear begin to dry up and turn yellow, and the grains at the top of the ear are shiny. At this time, the harvested seeds are full and the fresh ears are the heaviest. Don't harvest too tender. This land should be harvested in stages, not all at once. Must be harvested and sold on the same day.