1. Timely colonization. In the central and southern regions of our province, the suitable planting period of spring lettuce is generally in late March. 4 cubic meters of rot-cured chicken manure, 30 kg of compound fertilizer, 1 kg of boron fertilizer, and 1 kg of zinc fertilizer are turned deep and leveled to make flat hoe. The planting should be on a sunny morning, and the planting depth can be flush with the soil. After watering, the planting density is generally controlled at a row spacing of 40 cm and a plant spacing of 30 cm. 2. Field management. Water the planting water during planting and cover the mulch the next day after planting to increase the ground temperature and slow down the seedlings quickly. Due to the low ground temperature in early spring, it is not advisable to water more. After the first 15 days of planting, the second water should be poured into the squatting stage. When the young stems of lettuce begin to swell, they should be topdressed with water and 50 kg of ammonium bicarbonate per acre. After entering the period of tender stem expansion, it is more sensitive to water. The soil should be kept moist and watered once every 7 days. 3. Prevent diseases and insects. Downy mildew is a common disease in the production of lettuce. It mainly infects the leaves. The seedlings become yellow and die after the disease occurs. The adult plants begin to develop from the old leaves at the lower part. Corresponding locations are white mold, sometimes the mold layer can spread to the front of the leaf. The diseased spots on the leaves became brown in the later stages, connected into pieces, and yellowed and withered. Sometimes, the germs can spread to the stem and cause the stem to turn black. It can be controlled with 68.75% silver fari spray. Underground pests, such as small tigers, mainly damage the roots of lettuce, and can be irrigated with phoxim. Aphids and whitefly can be controlled by spraying with 10% imidacloprid 800-1000 times. 4. Harvest in time. The harvest time of lettuce is when the heart leaves and outer leaves are flat, commonly known as "flat mouth", that is, when the top of the lettuce is flat with the tip of the highest leaf, it is the best harvest time. Premature harvest, low yield, late harvest, quality decline. Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone Web Usb Live Camera,Webcam Broadcast Video,Usb Webcam Broadcast Video,Usb Live Camera Shenzhen Zuomi Technology Co., Ltd. , https://www.bkvis.com