Spring corn double film seedling raising technology

1. **Fertilizer Seedbed Preparation**: In the nursery, seedlings were first planted, and a suitable rapeseed bed was selected. The dry nursery pond was used as a seedling bed for spring corn. The ratio of the seedbed area to the field (Daejeon) is 1:20. However, when considering the actual planting area, the ratio should be adjusted to 1:10 to 1:15. The size of the seedbed should be at least 7 cm in diameter. To prepare the bed, plowing should be done in early spring to expose the soil to sunlight, which helps activate the soil and improve its fertility. Before sowing, weeds must be removed from the seedbeds to ensure better production quality and efficiency. The seedbeds for spring corn should be nutrient-rich. This requires improving the soil quality of the bed first, then providing essential nutrients on time, and finally creating a scientifically balanced nutritional mix. Based on practical experience, a standard seedbed of 1.5 meters in width and 4.5 meters in length is prepared before the Spring Festival. For each bed, 300 to 400 kg of human and animal manure, 3 kg of phosphate fertilizer, 1.5 to 2 kg of ammonium bicarbonate, and 0.5 kg of potassium fertilizer are used. Additionally, 150 ml of Huimanfeng is added and thoroughly mixed to enrich the soil, enhance seedling resistance, and improve overall seedling quality.

2. **Seedbed Composition**: The bed soil, fertilizers, and Huimanfeng should be thoroughly mixed. Water should be added in an amount sufficient for 4800 to 5000 seedlings per mu (a traditional Chinese unit of area). This ensures that enough healthy plants are transplanted into the field.

3. **Timely Sowing**: The ideal time for nursery seeding is between March 15th and 20th. After a 15- to 20-day growing period, when the seedlings have 2.5 to 3.5 leaves, they should be transplanted into the field under plastic film in early April.

4. **Nurturing Strong Seedlings**: Careful attention is required during the seedling stage. Water the seedbeds appropriately, and plant large seeds, using 1 to 2 seeds per hole. Cover them with fine, moist soil about 1.5 to 2 cm thick. Apply mulch, then install arch-shaped plastic covers, ensuring they are tightly sealed for heat retention and faster growth. Once the seedlings emerge, remove the mulch. Water the bed regularly, especially when the soil surface becomes dry. During high temperatures, ventilate the greenhouse to cool it down. Gradually uncover the greenhouse film once the seedlings have one leaf and one heart, usually over a period of about three days. One day before transplanting, spray the seedlings with vitality water to boost their resistance and develop strong, healthy, and resilient young plants.

This detailed process ensures optimal conditions for seedling growth, leading to higher survival rates and better yields in the field.

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