What are the key measures of plastic film corn cultivation technology?

1. Fine land preparation. Film-covered corn is generally selected for medium-to-high fertility water land, flat land, gentle slope mountain land, or dry land with high fertility to fully realize its potential for increasing yield. Before planting, be sure to prepare the land carefully, remove large soil blocks, stones, stubbles and weeds. The ground must be level and the topsoil must be finely crushed to ensure the quality of the film.

2. Select good varieties. Plastic film mulching has prolonged the growth time of corn, and excellent hybrids with a growth period of 10-15 days longer than the local corn should be selected. Otherwise, the use of short-growth varieties will not achieve the purpose of increasing yield.

3. Apply foot fat. It is not easy to topdress after mulching, and the nutrients in the soil under the film are not easy to decompose, so it is necessary to apply sufficient base fertilizer. The base fertilizer should be turned in during autumn ploughing or applied with high-quality organic fertilizer of 1000 ~ 2000 kg / mu, 15-25 kg of nitrogen fertilizer, and 25-40 kg of phosphate fertilizer before sowing.

4. Broadcast early. Because mulch cultivation can raise ground temperature, it can be 10-15 days earlier than the local open field sowing date. If the area is covered with plastic film before sowing, the film should be covered 10-15 days before sowing in order to increase the ground temperature. When planting, be sure to plant the plantars. First sowing and mulching can be seeding or hole sowing. If you use mulching and sowing first, you can drill holes at the required density. During hole-seeding, 2 to 3 grains are used in each hole. Generally, the amount of seeds per mu is 2 to 2.5 kg.

5. Reasonable dense planting. Dense planting is the central link to increase the yield of plastic film corn. In view of the limitation of film width, wide and narrow rows are generally used, and the density range is 3500 ~ 4000 plants per mu. For example, when planting seedlings, the plant spacing must be strictly controlled to ensure the density. For hole sowing, the number of planting holes per acre must be calculated to ensure the density.

6. Apply herbicides. The application of the herbicide is carried out immediately after sowing. Use 75 grams of Sola (or 150 grams of Majin) per acre, add 50 kilograms of water and spray evenly on the ridge surface with a sprayer, and then immediately cover the film.

7, specifications covered. In order to improve economic benefits, it is better to choose a microfilm with a thickness of 0.008 mm and a width of 40 to 60 cm, and the dosage per mu is 3 to 3.5 kg. Ordinary mulching film with a film thickness of 0.015 mm or less and a film width of 70 to 80 cm is also acceptable, but the cost is higher. When laying the film, it must be close to the ground. The soil on the edge of the film is about 5 cm, and the edge of the film is pressed tightly.

8, timely seedlings. After sowing, often check the emergence of seedlings. When the seedlings are unearthed, the above mulch must be punctured to induce seedlings to emerge. The holes should be small, and after the seedlings are placed, they should be sealed with soil around the base of the stem to keep them warm. Putting the seedlings several times until the whole seedlings emerge.

9. Remove film and remove waste film. After mulching, the surface temperature in the membrane increases, which is not good for the later development of the root system. Therefore, it is necessary to remove the membrane in time before the peak of the rainy season. After harvesting, the waste film should be removed to prevent the waste film from destroying the cultivation layer, affecting the air permeability of the soil and ensuring the next year's high yield.

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