Latest Key Points of the Early Spring Sweet Corn Planting Technique Tutorial

Everyone loves fresh sweet corn. It has a large market capacity, high yield and good returns. From sowing to harvesting fresh cobs takes about 90 days, and it does not affect the planting of hybrid rice. It is a good grain-and-cash cropping model for producing thousands of jin of grain and thousands of yuan per mu. Summarizing recent cultivation practice, to grow spring sweet corn well, the following points should be carried out well:

Use good seed

At present, the main sweet corn varieties promoted for planting in Henan are Super Sweet No. 3 and Super Sweet 204, and new varieties such as Dongtian 206 can also be trial-planted and demonstrated. These varieties have high yield, a medium growth period, a fresh kernel sugar content above 16%, and good taste for fresh eating.

Sow at the right time and raise strong seedlings

Generally, sowing starts around March 15-20, and nylon film with a frame covering must be used for seedling raising. Choose a sandy loam plot with loose soil, good fertility and sufficient sunlight as the seedbed. After fine land preparation, apply a round of thin human manure fertilizer, arrange the corn seeds at a seed spacing of 3-5 cm, press lightly, then cover the seeds with fine soil about 1 cm thick, and then build a frame and cover with film for heat preservation. The seedling age is about 20 days, and the leaf age is from 2 leaves and 1 heart to 3 leaves and 1 heart. Prevent over-age transplanting, which reduces yield.

Improve land preparation and transplanting quality to ensure full and even stands

Before plowing, broadcast 25-30 kg of ammonium bicarbonate and 25 kg of calcium superphosphate per mu as base fertilizer. After plowing, prepare the land and make beds, with beds 1.2 m wide (including ditches) and two rows planted. For plots with heavier clay soil, fertilizer can be applied all at once: open a ditch 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, evenly spray 100 ml of 80% acetochlor mixed with water per mu on the bed surface to control weeds, then cover with plastic film and wait to plant seedlings. However, for leaky fields with heavier sandiness, fertilizer should not be applied all at once, and fertilization should follow the principle of “applying appropriate seedling fertilizer and heavy ear fertilizer.” Plant the corn seedlings, then water with 50% phoxim or 40% chlorpyrifos at 1000 times dilution to control underground pests, then cover a little soil to ensure survival. The transplanting density is 3300-3500 plants, with a plant spacing of about 33 cm. After transplanting and survival (about 7-10 days after planting), seedling fertilizer should be applied in time, generally 10 loads of thin human manure 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. During the trumpet stage, use 600 times dilution of Bt emulsion (Bacillus thuringiensis) or 500 times dilution of 18% dimehypo or 1000 times dilution of 90% trichlorfon crystals to pour into the whorl to control corn borer. The use of highly toxic and high-residue pesticides is strictly prohibited. The use of any pesticide should stop 15 days before harvest.

Sweet corn should be planted in isolation from common corn

A separation of more than 300 m is required 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 losses caused by too large a quantity ripening all at once.