Key points of planting techniques of sweet corn in early spring

We all like to eat fresh sweet corn, with large market capacity, high yield and good benefit. It takes about 90 days from sowing to fresh ear harvesting, which does not affect the planting of hybrid rice. It is a good grain economic planting model with a yield of 1000 jin and thousands of yuan per mu. Summing up the cultivation practice in recent years, we should pay attention to the following points in order to grow spring sweet corn.

Use improved varieties

At present, the main sweet corn varieties popularized and planted in Henan are super sweet 3 and super sweet 204, and new varieties such as Dongtian 206 can also be planted and demonstrated. These varieties have high yield, medium growth period, more than 16% sugar content in fresh seeds and good taste in fresh food.

Sowing seeds at the right time to cultivate strong seedlings

Generally from March 15-20 or so to start sowing, nylon film must be used to cover the seedlings. Choose the sandy soil with loose soil, good fertility and plenty of sunshine as the seedbed, after fine soil preparation, apply thin human manure once, arrange the corn seeds at a distance of 3-5 cm, slightly suppress, and then cover the seeds with fine mud, about 1 cm thick, and then build a film to keep warm. The seedling age is about 20 days, and the leaf age is from 2 leaves to 3 leaves, which can prevent over-age transplanting and reduce the yield.

Improve the quality of soil preparation and transplanting to ensure the whole seedling and uniform seedling

Before ploughing, 25-30 kg of ammonium bicarbonate and 25 kg of calcium phosphate were applied to each mu. After ploughing, the land is prepared to make a bed with a width of 1.2 meters (even ditches) for two rows. The fields with heavy soil stickiness can be fully fertilized at one time, that is, 75 kg of ammonium bicarbonate, 25 kg of calcium superphosphate and 15 kg of potassium chloride can be applied in the middle of the border. After covering the soil, the mu is evenly sprayed with 100 ml water of 80% Acetochlor to control weeds and then cover with plastic film to be planted. However, in the leaky paddy field with heavy sand, fertilizer should not be applied at once, but should be fertilized according to the principle of "suitable application of seedling fertilizer and heavy application of pu fertilizer". Planting corn seedlings, and then watering with 1000 times of 50% phoxim or 40% chlorpyrifos to control underground pests, and then cover some land to ensure survival, transplanting density of 3300-3500 plants, plant spacing of about 33 cm. After transplanting survived (about 7-10 days after transplanting), seedling fertilizer should be applied in time, generally 10 piculs of rarefied human material or 10 kg of ammonium sulfate per mu.

Strengthen management

Sweet corn varieties have the phenomenon of multi-spikes, which should be removed in time, leaving one strong ear per plant. During the trumpet period, the corn borer was perfused with bt emulsion (Bacillus thuringiensis) 600x or 18% dipterex 500x or 1000 times of 90% crystal trichlorfon. The use of highly toxic and high residual pesticides is strictly prohibited. The use of any pesticides should be stopped 15 days before harvest.

Sweet corn should be planted in isolation from ordinary corn

Require an interval of more than 300 meters to prevent flowers from affecting the quality of sweet corn, fresh sweet corn can be sown in batches to continuously supply the market, to avoid one-time mature quantity is too large, resulting in losses.