Sweet corn planting technology

Today I will tell you about the sweet corn planting technology, which is very good. You can take a good look at it:

1. Site selection and land preparation

The cultivation base must be pollution-free and should be isolated from ordinary corn and glutinous corn by more than 300 meters or for more than 15 days to prevent the quality from being degraded due to the cross-pollination and maintain the flavor of sweet corn. Apply sufficient base fertilizer during land preparation, 1 ton of decomposed organic fertilizer + a bag of mixed superphosphate per mu, or 60 kilograms of compound fertilizer + a bag of superphosphate, and then make ridges.

2. Seedling cultivation and transplanting

1. Seedling cultivation

Choose fertile garden soil, or mix 70% field mud, 30% decomposed animal manure and plant ash into nutrient soil, and spread it in the seedling tray for plug seedling cultivation. Choose a sunny day to dry the seeds for half a day before sowing to increase the germination rate. Soak the seeds in 25-30℃ warm water for 2-3 hours, remove the seeds, rinse with clean water, and place them in a clean woven bag. Rinse with clean water when the seeds are hot or sticky. After 2-3 days, when the seeds germinate, select the germinated seeds and sow them in the prepared seedling tray, cover them with nutrient soil and drench them with water. In order to make the sweet corn marketed evenly and reduce sales pressure, a batch of seeds can be soaked and sown every 5-10 days according to the temperature.

Seedbed management: When the temperature is low, cover the seedbed with a film. When the temperature is high in summer, cover the seedbed with a shade net. Water the seedbed with a spray depending on the soil moisture to keep it moist. Apply water and fertilizer once during the three-leaf stage. The ratio of water and fertilizer is: dissolve 2 liang of compound fertilizer in 100 jin of water and sprinkle evenly. Spray the seedling-strengthening agent evenly on the seedbed one day before transplanting the seedlings.

2. Transplantation

Transplant the sweet corn seedlings when they have 4-5 leaves. Select strong seedlings and transplant them with soil in nutrient cups. Water them once after transplanting to ensure rooting. The average planting density is 2 feet in row and 0.8-0.9 inches in plant spacing, 3000-3500 plants/mu. Water and fertilizer are applied for the first time in the seedling stage after the transplant survives (3-5 days), the second time 10 days after transplant (7 leaves), and the third time 16 days after transplant (9 leaves). These three times of water and fertilizer in the seedling stage are the key to high yield. Water and fertilizer dosage: 1 jin urea + 4 jin compound fertilizer/mu, add water, and water 1-2 inches away from the seedlings.

3. Management during the jointing period

At the trumpet stage (10-11 leaves), topdress the jointing fertilizer in combination with soil cultivation, and apply 40 catties of compound fertilizer + 15 catties of potassium fertilizer per mu. Sweet corn needs water but is afraid of water. Pay attention to waterlogging prevention in the rainy season, keep the ditch free of water, and irrigate the ditch in time in the dry season, drain immediately after irrigating, and do not keep the water overnight. Remove the tillers in time, and after topdressing the jointing fertilizer, spray dwarfing agent appropriately when there are 10-11 leaves, 15-20 ml per mu.

4. Heading stage management

During the silking period, apply fertilizer to attack the buds. Apply 50-60 catties of compound fertilizer + 15 catties of potassium fertilizer per mu. Spread the fertilizer on the ridge surface and combine it with irrigation or rainwater to allow the fertilizer to be absorbed. Promote the development of the cobs and full fruiting. The 10 days before and after heading and pollination are water-sensitive periods. Do not allow drought. Keep the water holding capacity of the soil in the field at 70%-80%. After the sweet corn cobs are formed, do not cut off water too early to cause premature aging of the plants. The water content in the field should be maintained.

In principle, only one ear is kept per corn plant. When silking, only the main ear is left to grow, and the spikelets below the main ear are removed in time so that nutrients can be concentrated on the main ear. When the silk of the second and following small bracts is 2-3cm, they are removed and can be sold as sweet corn shoots. After removing the spikelets, you can apply a grain fertilizer once depending on the seedlings, spray potassium dihydrogen phosphate, foliar fertilizer, or apply 15 catties of urea + 5 catties of potassium fertilizer combined with irrigation or rainwater.

5. Harvest at the right time

Sweet corn must be harvested at the milky stage (optimal harvesting period) and put on the market in time to have commercial value. The harvesting period of spring-sown sweet corn is in the hot season, and the suitable harvesting period is shorter, generally 18-20 days after silking. The harvesting period of autumn-sown sweet corn is in the cool season of autumn and winter, and the suitable harvesting period is slightly longer, generally 20-25 days after silking. The optimal harvesting period varies for different varieties and seasons.

Harvest standard: The bracts of the sweet corn cobs are green and tightly wrapped, the filaments wither and turn dark brown, the kernels swell to their maximum size and are bright in color, and milky juice flows out when the kernels are squeezed.

The best time to harvest is in the morning (before 9 a.m.) or evening (after 4 p.m.). In the cool autumn season, the harvesting time can be appropriately relaxed to prevent the ears from being exposed to high temperatures and evaporating water, which will affect the quality and freshness of sweet corn. Sweet corn is best sold on the day it is harvested, and can be stored for 3-5 days if refrigerated conditions are available. High temperatures will accelerate the decline in the quality of sweet corn. After the ears are picked, they are prone to heat and deterioration when piled up, so it is best to spread them in a cool and ventilated place. In summer, refrigerated trucks or iced transportation methods should be used to maintain the quality of fresh ears.