In production, picking leaves is a necessary measure for the management of tomatoes. Reasonable picking leaves can effectively improve the ventilation and light transmission between the rows, promote tomato coloration, reduce nutrient consumption and the occurrence of diseases and pests, but the leaves must be moderated for the tomatoes. What are the specific requirements? The introduction is as follows.
First, the leaves should be divided and timely
The diseased leaves, yellow leaves, old leaves, and dense leaves should be removed in batches. It is a criterion to ensure that photosynthetic products required for fruit growth do not cause field canopy closure. In addition, before picking the leaves, we should pay close attention to the weather forecast and choose to do it on a sunny morning. Avoid as far as possible the leaves on a cloudy day so that the wounds can dry and heal as soon as possible under sunlight and higher temperatures. When picking leaves, try to avoid expanding the wound. After the leaf is picked, the medicine for preventing and controlling gray mold is sprayed in time, and the wound of the lower part of the stalk can be sprayed to form a wound, especially a backlit wound. When the humidity is high in a cloudy day or a rainy day, it can be combined with the method of smoked shed.
Second, the lower part of the plant yellow leaves should be picked
Yellow leaves of plants, reduced chlorophyll, photosynthesis are greatly affected, resulting in insufficient photosynthetic products, tomato fruit growth was blocked. However, the photosynthetic activity of yellow leaves did not stop. If the yellow leaves are directly removed, the leaves of the plants are too few and the photosynthetic products are more insufficient, and the growth and development of the tomato fruits are more affected. Experienced farmers all know that when growing normal tomato plants, it is best not to remove all the leaves under the ear of immature fruit, but to keep 1 to 2 tablets. In particular, when the light is strong, it is impossible to pick up too much leaves, otherwise it will lead to poor coloration of tomato fruits, and the swelling will be affected.
Therefore, for the yellow leaves should not be removed prematurely, but should take measures to solve the problem of yellow leaves, as far as possible to restore normal yellow leaves. There are many reasons for the yellow leaves of tomatoes. Root injury, lack of elements, drought, gas damage, and phytotoxicity may cause yellow leaves. Therefore, symptomatic treatment is needed. Injury caused by root injury, it is recommended that vegetable farmers can use bacteria to chelate biological fungicide, promote root growth, ensure adequate supply of nutrients, enhance plant resistance, ease yellow leaves; caused by poor air permeability, organic fertilizer should be increased from Fertilizers, deep-improved soils, etc. start from; deficiency of yellow leaves caused by old leaves is mainly nitrogen and magnesium, and new leaves turn yellow, mainly iron deficiency, zinc, etc., according to the lack of elements, the foliar spray with Water flushing fertilization materials can quickly solve yellow leaves caused by lack of elements; timely watering after drought, air pollution should be based on the removal of the source of air damage on the basis of strengthening ventilation.
Third, the leaves can not be picked up
Removal of the parietal lobe may cause less production of photosynthetic products and insufficient accumulation. The fruits do not develop sufficient nutrients to form empty fruits, and they are small in fruit and low in yield. They are also vulnerable to direct sunlight and produce sun-burning fruit. . The removal of the leaves will increase the aging of the root system, resulting in insufficient supply of water and mineral nutrients, and an increase in the proportion of empty fruit. Therefore, prevention of empty holes in tomatoes must begin with the protection of the leaves and prevent the leaves from being too heavy. When topping, one or two leaves should be retained above the upper ear.