The best planting time of autumn corn is specific.

High-yield planting method of autumn corn

1. Variety selection: select varieties with short growth period, wide adaptability, strong disease resistance, beautiful ear shape and good fresh fruit taste, such as Yunuo series, SEAO series and Jingkenuo series.

2. Planting density: generally, close planting is required, with row spacing 1m and nest spacing of 0.33-0.38m, with two plants in one nest and 3500-4000 plants per mu.

3. Sowing: It is generally advisable to sow autumn corn in late July, and the latest sowing time should not exceed mid-August. High altitude areas should be broadcast early in mid-July. (1) The technology of accelerating germination and direct seeding is generally adopted in large-scale production. The seeds used per mu are about 1.5 kg. Soak the seeds for 2-3 hours, moisten them with wet towel or wet sand to accelerate germination, and then sow them when they germinate. Sow 2-3 seeds directly in each nest. During the sowing period of autumn vegetables and corn, the temperature is high and the seeds emerge quickly. Seeds can emerge in 3-5 days after sowing, and seedlings can be fixed in 10 day, with 2 plants left in each nest. (2) Plastic floppy disk seedling raising and transplanting technology. Select special plastic floppy disks for corn seedling, each with 50- 100 holes, the seedbed width1.2-1.5m, the bed bottom is flat and dense, and the nutrient soil is 70% fertile and loose garden soil, 30% high-quality farmyard manure and 1-3% phosphate fertilizer. Put the floppy disk into the whole seedbed, with the bottom of the bowl close to the seedbed, then spread the prepared nutrient soil into the holes of the floppy disk (filling three quarters of the holes), sow two full seeds in each hole, fill the holes with nutrient soil, fill the gaps between the seedling plates with fine soil, pour enough water, and finally spread a layer of wet straw or build a sunshade net film. The humidity of seedbed should be based on the fact that the soil is not completely dry. After emergence, the plastic film should be removed in time to promote growth, and the seedlings should be transplanted to the field when they grow to two leaves and one heart to three leaves.

4. Straw mulching. Popularizing straw mulching to prevent drought and protect seedlings in autumn sowing in rice fields. In case of severe drought during the period from emergence to heading and flowering, clear manure water should be used to prevent drought and protect seedlings.

5. Formula fertilization. Corn is a fertilizer-tolerant crop, so it is very important for it to build a high-yield shed and obtain high yield. The general fertilization principles of autumn vegetable corn are: base fertilizer, light seedling fertilizer, suitable jointing fertilizer and heavy bract fertilizer. Apply 2000 kg of soil residue fertilizer +65438+ 05 kg of urea or 30 kg of ammonium bicarbonate+30-35 kg of calcium superphosphate or 40 kg of 35% corn fertilizer per mu in the sowing ditch. After emergence, 5 kg urea and 2000 kg manure were mixed to raise seedlings. After entering the jointing stage, each mu should be topdressing with 10 kg urea or 25 kg ammonium bicarbonate with 2000 kg manure. When the corn enters the big trumpet stage, that is, 40-50 days after sowing, the bud fertilizer is applied again, and 2000 kilograms of manure water is mixed with 30 kilograms of urea or 80 kilograms of ammonium bicarbonate and 5 kilograms of potassium fertilizer to drench the nest.

6. Control pests and diseases. According to the insect situation forecast of the plant protection department, we should focus on the prevention and control of corn borer, and the appropriate prevention and control period is at trumpet stage. You can choose Bacillus thuringiensis wettable powder, 1% emamectin benzoate emulsifiable concentrate mixed with fine sand, or sprinkle it on the heart leaves with refreshing granules after mixing. Pay attention to stop using pesticides 7 ~ 10 days before harvesting to avoid pesticide residues exceeding the standard.

7. Artificial pollination. The temperature of autumn vegetables and corn is unstable at the loose pollen stage, and the male and female are often uncoordinated. In addition, there are many autumn rains, and natural pollination is not ideal, so artificial pollination should be strengthened. Reduce bald tips and get high yield. After the filaments of most plants are spit out, mixed pollen is collected and artificially pollinated twice. Improve the seed setting rate. At the same time, the scattered male flowers are removed irregularly, which enhances the illumination and permeability and reduces the pests and diseases.

8, timely harvest. The harvest period of autumn corn is generally 30 ~ 35 days after pollination. Premature harvest has insufficient filling, low yield and lack of umami flavor in late harvest.