Apply low-phosphorus NPK compound fertilizer or balanced water-soluble fertilizer with water before tobacco germination, supplement certain NPK elements to plants, use gibberellin growth regulator, which can promote germination and growth, and prevent flowers and fruits from falling off in case of pests and diseases. Use ethyl spinosad, bifenthrin, acetamiprid, imidacloprid and other drugs, and pay attention to alternate medication.

Tobacco growth cycle

Tobacco needs to go through many processes to grow into a plant after sowing. Seed germination to seedling formation can be divided into four stages: emergence, small hybridization, large hybridization and seedling formation. The field growth after transplanting can be divided into four stages: seedling returning stage (7- 10 day), rooting stage (25-30 days), vigorous stage (25-30 days) and mature stage (50-60 days).

Tobacco spraying

Tobacco germs will stay in the soil, stay on patients and disabled people for the winter, and then spread through rain the next spring. Choose a variety with strong disease resistance (such as K326) when planting, and use it once when cultivating the soil. Chlorothalonil and agricultural streptomycin are commonly used drugs.

Spraying boron-calcium foliar fertilizer on tobacco at flowering stage can solve the problems of boron deficiency affecting calcium absorption and low utilization rate of calcium deficiency, better supplement boron and calcium and improve fruit setting rate.

Tobacco spraying has developed rapidly.

Before tobacco germination, low-phosphorus NPK compound fertilizer or balanced water-soluble fertilizer is applied with water to supplement certain nitrogen, phosphorus and potassium elements of plants.

Tobacco flowering and drugs

Tobacco can use gibberellin growth regulator, and gibberellin can promote germination and growth, and prevent flowers and fruits from falling off. Gibberellin is easily soluble in water. Use it as soon as possible after preparation, otherwise it will be ineffective. Using gibberellin with the concentration of 30 ppm ~ 100 ppm can make tobacco blossom earlier and more.

Tobacco Insecticide and Pest Control

If tobacco has diseases and insect pests, it is necessary to spray insecticides such as ethyl spinosad (Alice), bifenthrin, acetamiprid and imidacloprid. Acetamiprid and imidacloprid have good internal absorption and can be used together. Pay attention to alternate medication.

Prevention of tobacco diseases and insect pests

1, and select varieties with good resistance, such as burley tobacco, 40 1 systematic varieties and green stalks. Easily infected with black shank, powdery mildew, leaf spot and so on. , and it is best to choose varieties with strong disease resistance such as k326 and g28.

2. Strengthen the cultivation management: renovate the soil in advance, do a good job of disinfection, remove diseased leaves or plants in time and burn them centrally, plough them in time after harvesting, burn the roots of tobacco plants, and dig deep in winter to eliminate pests.