Lettuce is not strict with the former, and can be used in conjunction with other leafy vegetables. Crop rotation can also reduce disease, increase yield, and improve quality. Before lettuce, it is best to eat melons, solanes, beans, and onions and garlic vegetables. Although the lettuce growing time is long, but the planting time is small, the time from planting to harvesting is short, and it can be planted with cucumbers, legumes, tomatoes and other plants. According to the cold nature of lettuce and avoiding high temperature, it can be cultivated in spring and autumn, in Shandong and North China, and planted in spring and spring in February-March, and harvested in May-June. In late July, it will reach 8 Seedlings are sown in late October and harvested from October to November. In addition to the spring and autumn seasons, lettuce can also be grown in the summer under shading conditions, such as the use of sunshade nets or foil shades or intercropping with sorghum vegetable crops. In recent years, with the development of vegetable greenhouses and the improvement of the economic benefits of planting, it is possible to carry out deep winter and early spring protection cultivation in winter greenhouses with good results. Due to the low temperature in this period, the required growth period and harvest period are longer. The nursery period takes 30-40 days, and it takes about 60 days from planting to harvesting. Can be harvested according to market demand, so the sowing time is more flexible. If it is listed on the New Year's Day to the Spring Festival, it can be planted in the middle or late October. Early spring can be planted in December or early in the middle or late November. Due to the combination of open cultivation and protected cultivation, the annual supply can be achieved. In order to make full use of the land and sunlight and increase the economic benefits of lettuce, lettuce can adopt the following three-dimensional planting patterns: (1) Greenhouse pepper, lettuce, and beans are used to intercropping large and small crops. Small squid 80 cm, plant lettuce. Otsuka 120 cm, can plant 3 rows of pepper. Lettuce can use round leaf varieties, sowing seedlings in mid-January, about 40 days of seedling age, planting in late February. Each row is planted with 2 rows, with a spacing of about 30 cm, and about 1800 plants per 667 square meters. After planting, a small shed is stamped. In the middle of April, the market can be harvested. Pepper can be sowed in the middle of last year in December, about 90-100 days of seedling age, planting in mid-March, about 30 cm from the hole, planting 2 plants per hole, equivalent to about 6,000 plants per 667 square meters. After the peppers were planted, the small shed covering the lettuce was removed and covered in the peppers. After the lettuce is harvested in mid-April, 2 rows of beans can be sown in the pods of the original lettuce, with a hole spacing of about 20 cm and 2-3 plants per hole. After shades of bean pods are served, peppers can be shaded. (2) Cucumber, chayote, and cucumber lettuce can be used for interplanting cucumber. In mid-February, they can raise seedlings in greenhouses and plant them in greenhouses in mid-March. The spacing is 80 centimeters, the spacing is 20 centimeters, and 4000 plants are planted per 667 square meters. Harvesting began in mid-April and was completed by the end of June. Chayote began bagging and germination in November of last year, and then used a bottomless plastic bag with a diameter of 20 cm to hold nutritious soil seedlings. Each bag contained a melon seed. Around mid-April, in the greenhouse, along the front shed and the front of the cucumber line, dig a pit of about 1 meter in length, width, and depth, about every 4 meters, and apply 250 kilograms of decomposed organic in each pit. Each 10 kg of fertilizer, diammonium phosphate, and potassium sulfate are filled with water, and a pit is planted into a chayote seedling.
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