Detailed Explanation of Spring Fresh-Eating Sweet Corn Cultivation Techniques
Selecting good varieties: You can choose the sweet corn varieties Chaotian No. 3 and Chaotian 204, which were promoted and planted last year, or you can trial-plant and demonstrate new varieties such as Dongtian 206. These varieties have high yields, a medium growth period, a fresh grain sugar content of more than 16%, and good taste for fresh eating. Sow at the right time and cultivate strong seedlings. Generally, sowing begins around March 15 to 20, ...
Selecting good varieties: You can choose the sweet corn varieties Chaotian No. 3 and Chaotian 204, which were promoted and planted last year, or you can trial-plant and demonstrate new varieties such as Dongtian 206. These varieties have high yields, a medium growth period, a fresh grain sugar content of more than 16%, and good taste for fresh eating.
Sow at the right time and cultivate strong seedlings. Generally, sowing begins around March 15 to 20, and nylon film-supported covering must be used for seedling raising. Choose a loose, relatively fertile, sunny sandy loam plot as the seedbed. After fine land preparation, apply a round of dilute human manure fertilizer, arrange the corn seeds at a seed spacing of 3 to 5 cm, press lightly, then cover the seeds with fine soil about 1 cm thick, and then build a frame and cover with film for insulation. The seedling age is about 20 days. Transplant when the leaf stage is two leaves and one heart to three leaves and one heart, to prevent overage transplanting and reduce yield.
Improve land preparation and transplanting quality to ensure full stands and uniform seedlings. Before plowing, broadcast 25 to 30 kg of ammonium bicarbonate and 25 kg of calcium superphosphate per mu as base fertilizer. After plowing, prepare the land and make beds, with a bed width of 1.2 m (including the ditch) and two rows planted. For fields with relatively heavy clay soil, fertilizer can be applied all at once: open a furrow in the center of the bed and apply 75 kg of ammonium bicarbonate, 25 kg of calcium superphosphate, and 15 kg of potassium chloride per mu. After covering with soil, uniformly spray the bed surface with 100 mL of 80% acetochlor per mu diluted with water to control weeds, then cover with plastic film and wait to plant seedlings. However, for leaky fields with relatively sandy soil, fertilizer should not be applied all at once; fertilization should follow the principle of "moderate seedling fertilizer, heavy basal fertilizer." Plant the corn seedlings, then water with 50% phoxim or 40% chlorpyrifos at 1000 times dilution to control underground pests, then cover with a little soil to ensure survival. The transplanting density is 3300 to 3500 plants per mu, with a plant spacing of about 33 cm. After the transplanted seedlings survive (about 7 to 10 days after planting), seedling fertilizer should be applied in time, generally 10 loads of dilute human manure fertilizer or 10 kg of ammonium sulfate per mu.
Strengthen management. Sweet corn varieties have a multi-ear phenomenon, which should be removed in time, leaving one strong ear per plant. At the trumpet stage, use BT emulsion (Bacillus thuringiensis) at 600 times, or 18% bisultap at 500 times, or 90% crystal trichlorfon at 1000 times to pour into the whorl to control corn borers. The use of highly toxic and high-residue pesticides is strictly prohibited. Stop using any pesticides 15 days before harvest.
Sweet corn should be planted in isolation from ordinary corn, requiring a spacing of more than 300 m to prevent cross-pollination from affecting the quality of sweet corn. Fresh-eating sweet corn can be sown in batches to continuously supply the market and avoid a one-time large quantity ripening.