Picking leaves, one of the important means for the adjustment of vegetable plants, through leaf picking, can shape the best plant type suitable for greenhouse environment production. In general, leaf picking is the removal of leaves, and in plant physiology, the retention of leaves and leaves of plants directly affects or changes the distribution of photosynthetic organic matter in plants.
Since the leaves of vegetables can produce photosynthetic products through photosynthesis, they can be called a “nutrient sourceâ€. The growth and expansion process of vegetable fruits is like the process of nutrient accumulation, so it can be called “nutrition poolâ€, usually Under the fruit, the fruit and its upper and lower branches form a "source library unit." In general, photosynthetic products are transported from “nutrition sources†to “nutrition reservoirsâ€, from leaves to fruits, followed by “near transportation†(nutrient priority supply to the leaves closest to the leaves), “same side transportation†(nutrient priority supply) Laws on the same side as the leaves).
In fact, the picking of leaves in production is constantly changing the “source library unit†of vegetable plants, and removing 1-2 leaves below the fruit, the position of the “source library unit†will move up. This tells us that in production, when farmers pick leaves, they should pay attention to the best “source library unitâ€, but some invalid leaves should be removed.
Tomato picking leaves vary from species to species
In theory, tomato picking leaves should be linked to the “source library unitâ€, and in production, different types of tomatoes have different process of picking leaves. It is now described as follows:
1. Picking leaves of red and pink fruit tomatoes
The first time to pick the leaves is commonly known as "picking the bottom leaves", and the time of picking leaves is mostly carried out when the first ear is just beginning to appear in color. Focus on removing 1-2 leaves above the cotyledons of tomato plants. Analysis: By removing these so-called bottom leaves, it can promote the growth of stems and vines in the early stage of tomatoes, and achieve the purpose of promoting trees and prosperous trees. In addition, these bottom leaves are not big in the next minister. On the contrary, they may consume nutrients. If they are in the middle and late stages of tomato growth, they will be removed. First, the leaves are dense, and it is difficult to pick the leaves. Second, the bottom leaves are close to the mulch or the surface. The "infection source" of the disease occurred, so it was removed early and benefited early.
Picking the leaves in the second pass usually waits until the first spike fruit grows to an average of one adult's hand. (Note: After the thumb and forefinger are bent, the middle is added with two fingers wide (ie, one arc two). When the size is small, leave a leaf under the first ear, and remove all the lower part of it. According to this rule, if the red and pink fruit tomatoes leave 6-7 spikes, the number of leaves picked is at least 2 times.
When you start with a heart, you should take 1-2 tablets above the 6-7 spikes and start again. Purpose: First, to meet the nutritional needs of the ear, and second, under high temperature and strong light, can play a role in shading, reducing the occurrence of sunburn and umbilical rot.
2. Picking leaves of cherry tomatoes
The method of picking the first leaves is the same as that of red, pink and tomato. However, the second time to pick the leaves, it is only necessary to wait until the maximum fruit of the second ear is as long as the size of the adult's finger. This time, you can leave a leaf under the second ear and remove all the leaves below it.
The third time to pick the leaves, you can wait until the maximum fruit of the fifth ear is as long as the size of the adult's finger. After leaving a leaf under the fifth ear, remove the lower leaf. In production, leaf picking is an essential measure in the management of tomatoes. Picking leaves can effectively improve the ventilation and light transmission between the lines, and promote the color change of tomatoes. In the middle and late stages of tomato growth, the leaves of the base gradually become aging and yellowing, and the underlying light is weak. The ability of the lower leaves to produce nutrients is very low, and proper leaf removal is beneficial. The plants are steep and long. When the branches and leaves are dense and affect the ventilation and light transmission, the leaves should be picked up in time.
When picking leaves of tomatoes, the yellow leaves, old leaves and dense leaves should be removed in several stages. It is necessary to ensure the photosynthetic products required for fruit growth without causing field shading. In addition, before picking the leaves, you should pay close attention to the weather forecast, choose sunny day morning, try to avoid the cloudy leaves, so that the wounds dry and heal as soon as possible under the sun and high temperature. When picking leaves, try to avoid expanding the wound. After picking the leaves, spray the broad-spectrum fungicide "Baiqike" in time, focusing on the wounds formed by the leaves removed in the lower part of the stem, especially the wounds of the backlight. When the humidity in the shed is cloudy or rainy, it can be combined with the method of smoked shed.
The lower yellow leaves of tomatoes should be picked late.
"Look! The leaves of the lower tomatoes are all yellow, and certainly can't supply the fruit with nutrients. Let's get rid of it." This is the case in many vegetable farmers' sheds. In these sheds, it can be seen that the yellow and middle leaves of the whole middle and lower leaves of the plant appear, and the leaves of the serious leaves have not seen much green. The tomato fruits are small, the deformed fruit is large, and the upper flowering and fruit setting is affected. Under this circumstance, many vegetable farmers think that the yellow leaves are useless, and they are simply removed. This is not true. If the yellow leaves occur, the cytokinin can be sprayed with amino acid liquid fertilizer to delay the senescence of the leaves. Promote the greening of the leaves, combined with the products that promote rooting by irrigation or irrigation, cultivate the developed root system, ensure the adequate supply of nutrients, alleviate the yellow leaves and increase the yield.
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