With the growth of greenhouse tomatoes, the lower old leaves will be gradually destroyed. On the one hand, destroying these blades can improve ventilation and light transmission conditions and reduce the occurrence of diseases; On the other hand, the old leaves susceptible to diseases are destroyed to reduce the spread of diseases. At the same time, knocking out old leaves can prevent these leaves from unnecessarily consuming nutrients absorbed by roots and promote the better growth and development of plants. The beating of tomato leaves should follow the following principles:
1. Before the bottommost ear of tomato reaches the green ripe stage, that is, the fruit turns from green to white, the fruit is fully mature, and the seeds mature and start to turn red, the upper leaves cannot be knocked out. Because the 2-3 leaves on the top of the fruit make nutrition for the growth and development of the fruit, they are destroyed prematurely and affect the growth of the fruit.
2. Any leaves with dark green color, no pests and diseases, and no yellow spots can not be destroyed, because these leaves can still contribute to the yield of tomatoes.
3. The leaves at the bottom of the ear turn yellow, and the yellow spots or old leaves with serious pests can be destroyed.
4. Leaves in the middle and lower parts of plants that are severely yellowed and aged due to serious pests or other physiological diseases can be knocked out.
5. The leaves at the bottom of the ear can be knocked out.
6. When beating leaves, it is advisable to use 2 pieces at a time, not too much.
7. The interval between two threshings is greater than 10 day.
8. Every time you thresh leaves, it should be around noon on a sunny day 12. You should not thresh leaves in the morning when the dew is heavy to avoid wound infection. You can't beat leaves at night, for fear that the wound won't heal and get sick at night because of the high humidity.
9. Natural brassin-Shuofeng 48 1 should be sprayed once after threshing to promote the photosynthesis of leaves and avoid affecting the growth and development of plants.
If you don't follow the above principles when beating leaves, it will either cause serious diseases, or because of excessive leaf damage and insufficient fruit nutrition accumulation, which will lead to serious losses such as empty fruits and reduced production, or a large number of flowers and fruits will fall.