How should tobacco be managed in summer?

How should tobacco be managed in summer? Summer tobacco can be managed as follows: first, promote the seedlings to check and replenish the seedlings in time, pull out the weak seedlings and those bitten or bitten by underground pests, and replant new seedlings. When replanting, apply a small amount of nitrogen fertilizer or compound fertilizer in the hole, pour enough water, and apply poison bait in the hole. Partial fertilization can be applied to tobacco seedlings with weak growth. Second, ploughing and soil cultivation (1) Intermediate ploughing. The first intertillage was carried out about a week after tobacco seedlings were planted, and shallow hoe was used to break the knots and avoid injuring roots. The second intertillage is about 30 days after planting, combined with topdressing and soil cultivation, it is required to hoe deep, hoe thoroughly, hoe evenly, inter-row tillage depth is 10-14 cm, inter-plant tillage depth is 5-7 cm. The third intertillage should be carried out 10-15 days after the second intertillage, with a shallow hoe and a tillage depth of 5 cm. In terms of ploughing depth, we should strictly follow the principle of "the first is shallow, the second is deep, and the third does not hurt the roots." (2) cultivate soil. The soil is usually cultivated twice. The first time was about 20 days after tobacco seedlings were planted, and low soil cultivation could be carried out combined with topdressing. For the second time, 30 days after tobacco seedlings were planted, the height of the soil should be about 20 cm. The height of soil cultivation can be appropriately increased in areas with high groundwater level, more Rain Water and strong wind, while in areas with weak water conservation capacity such as sandy land and mountain land, the height of soil cultivation can be appropriately reduced. Third, watering and topdressing (1) watering. According to the local conditions and seedling conditions, the seedlings were watered back for 1 or 2 times. Returning seedling water should not be too much, so as not to cause excessive soil temperature drop and soil consolidation in the plough layer. After returning the seedlings to survive, the tobacco seedlings need less water, and generally do not water when the soil moisture is suitable, in order to facilitate squatting seedlings. If the growth of the aboveground part is blocked, it can be lightly watered once. (2) topdressing. The topdressing of tobacco seedlings was carried out 25 to 30 days after planting, and the amount of topdressing accounted for 1. 3 of the total fertilizer application. The amount of topdressing can be determined according to the growth of tobacco seedlings in the field, soil and climate. Topdressing, the weak seedlings, seedlings can be appropriate partial fertilization, applied on both sides of tobacco seedlings 10 cm, with a depth of 10 cm, strip application or hole application can be. Immediately after topdressing, cover the soil or cultivate the soil and water it. Fourth, disease control (1) mosaic disease. When the disease is mild, yellow and green spots are formed on the leaves; in severe cases, the color and luster of the diseased leaves are uneven, forming spots, wrinkling does not spread, the epidermis hairs fall off, and the leaves become narrower and twisted. 0.1%-1% sodium alginate, or 0.1% zinc sulfate and copper sulfate solution can be sprayed, and the control effect is good. (2) black shank disease. Each tobacco seedling was irrigated with metalaxyl 1000 times solution, or 0.3% ethyl phosphorus aluminum solution and 20% Ruidui emulsion 400 times 800 times solution were selected for foliar spray control. In severe disease areas, ridging and soil cultivation can be combined with pesticide application for 2 times, and the control effect will be better. 5. The main reason for preventing early flowering of tobacco is that tobacco is affected by low temperature and short day light during vegetative growth. The main way to prevent early flowering of tobacco is to avoid continuous low temperature below 18 ℃ after planting. Plastic film mulching cultivation can effectively prevent early flowering of tobacco. Tobacco with early flowering should immediately cut off the main stem and leave only 2-3 bottom leaves to facilitate axillary bud germination and growth. After the axillary buds germinated, one strong bud was selected, the rest were erased, and the management of fertilizer and water in the field was strengthened. For tobacco with light early flowering, topping and forking as soon as possible can greatly reduce the loss caused by early flowering. Click to get more tobacco planting techniques click to get more flower planting techniques