Analysis of the causes of tomato yellow leaves:
1. Root dysplasia. The delayed tomato seedling stage is in the high temperature period in summer, which is not conducive to the cultivation of robust roots. First of all, the high temperature environment is not conducive to root growth, and the roots are aging fast. Secondly, the high temperature environment of the farmer watering the soil is high, which is not conducive to the root system, the root amount is small, and the root layer is shallow. At the same time, the high temperature environment will cause the plant seedling period to be prolonged, which is not conducive to root growth. The roots have few roots, and the ability of plants to absorb nutrients and water is weak. As a result, nutrient deficiencies are easily caused and the plants are weakened.
2. Bad environment leads to aging of the leaves. After the tomato enters the result period, the leaves are generally dense. Combined with the high temperature environment during the daytime in autumn, it is easy to form a high-temperature and high-humidity canopy environment in the middle and lower part of the plant, which leads to early aging and yellowing of the leaves. This situation is easy in the front face of the greenhouse. appear.
3. Unreasonable fruit retention results in insufficient nutrient supply to the plants. The leaves are the suppliers of fruit nutrition, and the reasonable amount of fruit retention is the prerequisite for ensuring the robust growth of the plants. Many vegetable farmers in production are not willing to lose fruit, leading to more fruits in the early stage. For example, large tomatoes usually have 3-4 fruits per ear in the early stage, while some farmers leave 5-6, which will lead to excessive fruit consumption. Plant growth is weak, and functional leaves near the fruit are prone to yellowing.
4. Lack of magnesium. Magnesium is involved in the synthesis of chloroplasts in cells, and magnesium deficiency in plants causes yellowing between the middle and lower leaves. Therefore, magnesium deficiency is also an important factor in the production of the upper and lower leaves of the yellow leaves.
Tomato yellow leaf control method:
1. Rooting. Cultivating good root system is the basis for preventing yellow leaves. In the autumn delay, the rooting of tomato seedlings should pay attention to the following problems: reasonable watering, proper control of watering after slow seedlings, diligence, promotion of roots and lowering; rational selection of rooting The combination of the agent, rooting and hair roots, and the nutrient-type rooting agent should be selected in the slow seedling stage. After slow seedlings, algalic acid, chitin and other stimulating hormone rooting agents can be applied to promote new roots.
2. Reasonable retention. Do not leave too much fruit in the first three spikes. Tomatoes are controlled in 3-4 fruits per ear.
3. Keep the environment in the shed transparent, pruning and leafing in time, the number of insect-proof nets is not too high, generally about 60 mesh is appropriate.
4. Foliar application of nutrients to enhance nutrition and improve resistance to foliar fertilizer. The magnesium-containing foliar fertilizer can be sprayed according to the condition.
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