Cultivation techniques of beans in early spring

Prepare irrigation before sowing before winter, make soil moisture for sowing in early spring, 6 kg per mu, ultra-thin plastic film (70 cm wide), 3000 kg organic fertilizer, 10 kg urea, 8 kg diammonium and 10 kg potassium chloride per mu. Sow and cover with plastic film after the surface is thawed in early spring. The width of the border is 50 cm, the distance between the border is 50 cm, and the film is compacted by making a horizontal line with soil every 3 meters. The seeds were sown when the temperature was stable at 10 ℃ for 5 consecutive days. The sowing method is as follows: punch holes and sow seeds (hole sowing) on the film-covered border (hole sowing), sowing depth is about 3 cm, hole spacing is 30 cm, 3-4 seeds are planted in each hole, two rows are sowed in each row, the row spacing is 33 cm, and the average row spacing after sowing is 50 cm (among them: large row 67 cm, small row 33 cm). Field management should observe the situation in the field at any time, break the film and release seedlings when the plastic film and seedlings are about to contact each other, and pay attention to compacting the edge of the film around the seedling, carefully observe after the wind and rain weather, there is stagnant water on the film to eliminate stagnant water, the damaged film should press the soil or re-cover the film in time. Bean seedlings grow to 3-4 true leaves when the first water, with the water mu of urea 12 kg, and then temporarily do not water (continuous watering is not easy to bear pods). When the young pod grows to 3-5 cm, the second water is watered, and the third water is watered 10-15 days later. In late April, aphids were controlled with 2000-3000 times of imidacloprid warm powder or 0.3% of Sophora flavescens plant insecticides or 18% stable oil or 2000-3000 times of cypermethrin.