Key Technical Points and Common Patterns for Intercropping in Flue-Cured Tobacco Fields

Intercropping in flue-cured tobacco fields refers to a planting method in which other crops are sown or transplanted in good time during the mid-to-late growth stage of flue-cured tobacco or after the tobacco leaves have been harvested, making use of the remaining growing space and light and temperature resources in the tobacco field. This practice can raise the multiple cropping index of the land and fill the gap when the land would otherwise lie idle after the tobacco harvest, making it a commonly used approach in tobacco-growing areas to increase returns.

Common intercrop species include Chinese cabbage, radish, celtuce, peas, broad beans and green manure crops, as well as other types with a short growth period or good shade tolerance. When choosing intercrop species, care should be taken to avoid solanaceous crops in the same family as flue-cured tobacco, such as tomato, pepper and potato, so as to prevent shared diseases from spreading between them and increasing the difficulty of field control.

Intercropping is generally scheduled for the mid-to-late stage of tobacco leaf harvest, when the middle and lower leaves of the tobacco plants have been picked successively and the ventilation and light conditions in the field have improved markedly, which favors the emergence and seedling growth of the intercrops. After intercropping, the water and fertilizer relationships between the two successive crops must be well coordinated; after the previous crop is harvested, cultivate and earth up in time, apply topdressing to promote seedling growth, and irrigate as needed according to soil moisture so as to promote vigorous growth of the following crop.

Rational intercropping can make full use of the light, heat and soil fertility between tobacco rows, achieving two harvests from one field, while also helping to improve the soil environment and reduce continuous cropping obstacles. It should be noted that pesticides must be applied scientifically during the intercropping period, avoiding high-residue pesticides; for crops whose harvest period is close, the pre-harvest interval must be strictly controlled to ensure the quality and safety of the following crop's agricultural products.