1. The planting environment requires an environment suitable for its growth when planting in the open field. The lettuce has strong adaptability, not only cold-tolerant, but also resistant to insects, so it can be grown in many areas in the north and south of my country. 2. The planting time is usually in spring and autumn. Planting in spring around April, the weather becomes warmer, suitable for seed germination. Sow in autumn from August to September, the weather turns cooler, and the temperature is suitable for the growth and development of open-air lettuce. When sowing, pay attention to the temperature control between 20 ℃ ~ 25 ℃. 3. Soil selection. Lettuce is not strict with soil requirements, and it can be planted in general soil. Deep soil plowing and applying sufficient base fertilizer mix is ​​more conducive to the growth of lettuce. The base fertilizer can be mixed with mature farm manure and some compound fertilizer. It is recommended to apply 1000-2000 kg of base fertilizer and 15 kg of compound fertilizer per mu. 4. Open-air rapeseed can be sown directly with seeds. The seeds are sown into flat, finely fragmented, loose and fertile soil, and keeping the soil moist is conducive to seed germination. Seeds are generally easiest to germinate between 15°C and 20°C. If the temperature is too high or too low, the germination treatment should be carried out before planting to increase the germination rate of seeds. 5. Field management After planting is done, water as soon as possible. Slow seedlings can be carried out 3 to 4 days after watering. After the seedlings grow normally, spray fertilizer and apply 15 kg of urea per mu. In the later period, additional fertilization is required, with 30 kg of urea per mu. Do not apply fertilizer alone, but spray it with water. Generally, it is ready to be harvested when 15 leaves have grown. You must pay attention to harvesting in time. The leaves will grow old too late. There is still some difference between open field planting of rapeseed and greenhouse planting, but after mastering the technology, it can be handy. In addition, pay attention to the prevention and control of pests and diseases, and slowly summarize the planting experience, I believe everyone can also grow good lettuce. Small Air Hose Reel,Portable Air Hose Reel,Wall Mount Air Hose Reel,Commercial Air Hose Reel NINGBO QIKAI ENVIRONMENTAL TECHNOLOGY CO.,LTD , https://www.cxhosereel.com
Open field planting techniques and main points of lettuce