With the growth of tomatoes in the greenhouse, the lower aging leaves should be gradually knocked out. The elimination of these leaves can, on the one hand, improve the ventilation and light transmission conditions and reduce the occurrence of diseases; on the other hand, it can destroy some old leaves that are sensitive to disease and reduce the spread of diseases. At the same time, the elimination of old leaves can avoid the needless consumption of roots by these leaves and promote better plant growth. Tomato leaves should follow the following principles:
1. At the bottom of a tomato, the fruit of one ear reaches the green ripening stage, that is, the fruit turns from green to white, and the fruit is fully grown. The seeds are already mature and before they turn red, the upper leaves cannot be destroyed. Because the upper 2-3 leaves of the fruit produce nutrients for the development of the fruit, knocking out prematurely and affecting fruit growth.
2. Any leaf with dark green color, no pests and no macula can not be destroyed because these leaves can still contribute to the yield of tomatoes.
3. The leaf color of the lower part of the bottom one ear is yellowing, and old leaves with serious macular or pest damage can be destroyed.
4. The middle and lower part of the plant can be destroyed because of serious yellowing and aging of the leaves caused by serious diseases or other physiological diseases.
5. The leaves at the bottom of the ear of one ear can be knocked out. 6. It is advisable to use 2 tablets each time when the leaves are beaten. 7. The interval between two times of leafing is more than 10 days.
8. Every time the leaves are beaten on a sunny day at around 12 noon, do not use the leaves when the dew is very heavy in the morning to avoid the onset of wound infection. It is also not possible to hit the leaves in the evening so that the wounds do not heal, and they become ill at night when the humidity is high.
9. Once the leaves are beaten, they should be sprayed with a natural oyster extract 141 once to promote the photosynthesis of the leaves to avoid affecting plant growth and development.
If you do not follow the above principles when you hit a leaf, it is not a serious disease. It is due to too many leaf damages, insufficient accumulation of nutrients in the fruits, serious loss of fruit, loss of yield, or a large number of fruit drop.
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