(a) timely removal of film and weeding
The mulching film has the function of water and moisture conservation in the early stage of transplanting tobacco seedlings. With the growth of tobacco seedlings, the mulch film should be removed during the third cultivating of the tobacco field. On the one hand, the sunlight film is prevented from being too strong, and the light is reflected by the mulching film. The lower leaves cause burns. On the other hand, the third cultivator is used to cultivate soil to prevent the mulching of the mulching film and prevent the infiltration of moisture and nutrients, so that the tobacco plants can better absorb nutrients and moisture to ensure the nutrition of the new parts. Avoid the lack of nutrient moisture, transfer and absorption from the lower leaves, lower the quality of the lower leaves. Weeding on the one hand is to prevent weeds and tobacco plants from competing for water and nutrients, and on the other hand, it is to prevent the growth of weeds, shade the lower leaves, make the lower leaves suffer from lack of light, reduce the photosynthesis, and even the polyphenols in the leaves. Decompose and make the leaves yellow and thin until they die.
(B) Timely top-down
There is an apical advantage in the growth of tobacco, so that the nutrition of the plant gives priority to the supply of reproductive organs, so that the nutritional organs of tobacco can not be adequately nutritious. The tobacco is mainly used for the purpose of obtaining economical crops for the leaves. Topping can break the top edge of tobacco and make the nutrition of the plants more balanced. While promoting the growth of the upper leaves, it also makes the lower leaves compared with those before topping. More nutrition. The grown haze will also have an apical dominance, will continue to absorb nutrients, wipe out the haze, reduce its consumption of fertilizers and water, and prevent it from detoxifying due to its lack of nutrients.
(3) Properly setting the row spacing
Properly setting the plant spacing will help change the field microclimate in tobacco fields. Tobacco planting in tobacco fields cannot be overly dense. Over dense plants will cause the leaves of each tobacco plant to be shielded from each other and the leaves, especially the lower leaves, will suffer from insufficient light. The setting of row spacing also has an impact on the field temperature in the field. Appropriate thinning can increase the temperature of the surface during daytime under sunlight, which is beneficial to increase the activity of tobacco roots, thereby enhancing its nutrient absorption capacity and strengthening the nutrient supply of tobacco plants. The spacing of rows and rows should be set according to the variety and specific terrain of the tobacco. The orientation of the ridge and furrow should follow the wind direction that often occurs in the area, which can speed up the air circulation in the field.
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