In the fall, the lower leaves of tomatoes are easy to yellow, which makes many farmers have a headache. So what are the reasons for the yellow leaves in the middle and lower leaves of tomato? Let the farmer Kobayashi tell you why the middle and lower leaves of the tomato are easy to yellow leaves and the yellow leaves of the middle and lower leaves of the tomato.
First, what causes the middle and lower leaves of tomato yellow leaves
1. Root system is poor
Autumn delay tomato seedlings are in the high temperature period in summer, which is not conducive to the cultivation of robust roots. Firstly, the high temperature environment is not conducive to root growth, and the roots are aging fast. Secondly, the high temperature environment of the farmers is high in soil moisture, which is not conducive to the rooting of the roots, the roots are small, and the root layer is shallow. At the same time, the high temperature environment will cause the plant seedlings to be easy to grow. Not conducive to the growth of roots. The roots have a small amount of roots, and the ability of the plants to absorb nutrients is weak. As a result, it is easy to cause nutrient deficiencies and the plants are weakened by yellow leaves.
2. Bad environment leads to aging of the leaves
After the tomatoes enter the fruiting period, the leaves are thicker. Combined with the high temperature environment during the autumn, it is easy to form a high-temperature and high-humidity canopy environment in the middle and lower parts 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 retention of fruit
The leaves are the suppliers of fruit nutrition, and the reasonable leaf-to-fruit ratio 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 can leave 5-6, which will lead to fruit consumption. More, the plant grows weakly, and the 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.
Second, how to do the yellow leaves of the middle and lower leaves of tomato, the prevention and treatment of yellow leaves in the middle and lower leaves of tomato
1, raising roots
Cultivating good root system is the basis for preventing yellow leaves. In autumn, delaying tomato seedling rooting should pay attention to the following problems: reasonable watering, proper control of watering after slow seedlings, diligence and promotion, promotion of root system; reasonable selection Rooting agent, rooting and hair root combination, nutrient rooting agent such as phosphorus magnesium, Chuanpule, etc. should be selected in the slow seedling stage to promote rapid seedling growth. After slow seedlings, algalic acid, chitin and other stimulating hormone rooting agents can be applied to promote new roots. At the same time, it should be combined with microbial agents such as Phytophthora, Earthmaster, and Roots 120.
2, reasonable retention
Do not leave too much fruit in the first three spikes, and control the big tomatoes in each of the 3-4.
3. Reasonable shed management
Keep the environment in the shed transparent, pruning and leafing in time, the number of insect-proof nets is too high, generally about 60 mesh.
4, pay attention to the maintenance of the blade
Foliar spray application of nutrients to improve the resistance of foliar fertilizers such as: Lim, color beauty, chelated magnesium and so on.
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