The yellow leaves of melon directly lead to the weakening of the light and function of the leaves, and the lack of organic nutrient synthesis, which seriously reduces the overall yield of melon. This kind of melon yellow leaf is mainly caused by poor root growth, which leads to difficulty in the absorption of nutrients, not caused by bacterial or fungal infection. The root of prevention and control lies in early prevention, careful management from the seedling stage, and cultivation of strong seedlings and strong trees. The measures are as follows:
Early roots
First, pay attention to improving the soil and creating a soil environment suitable for plant growth. Applying the base fertilizer before planting, pay special attention to the use of biological bacterial fertilizer and decomposed organic fertilizer. The soil must be deep-turned (30-50 cm deep), which can not only supplement the nutrients needed for plant growth, but also improve Soil structure reduces secondary salinization of soil and reduces soil pathogens. Secondly, the colony is applied with biological fertilizer when planting. It takes a process to adapt the root growth environment of the seedling from the matrix to the soil. How to adapt the root system to the new environment as soon as possible is particularly important. Biological bacterial fertilizer can effectively activate loose soil and improve the utilization rate of organic fertilizer. More importantly, the beneficial bacteria in biological bacterial fertilizer can inhibit the infection of harmful bacteria in the soil and reduce the occurrence of diseases. Therefore, the application of biological fertilizer at the point of planting not only can improve the rhizosphere soil environment, but also establish a "bridge" for the smooth transition of the root growth environment from the substrate to the soil, which is conducive to slowing down the seedlings. Only when the root system grows, the capillary root can absorb the nutrients in the soil in large quantities, in order to achieve the purpose of strengthening the tree, thereby improving the plant's own resistance and reducing the occurrence of yellow leaves.
Pay attention to blade maintenance
The leaves are the plants for light and action of the plants, so the healthy growth of plant leaves is the basis for the normal development of photosynthesis, and it is the basis for the high yield of vegetables. How to extend the functional period of the leaves to prevent premature senescence of the leaves? This requires attention to the maintenance of the leaves.
First of all, pay attention to rational fertilization, timely supplement the nutrients consumed in the soil, ensure the normal growth of the leaves, and do not cause all kinds of physiological yellow leaves caused by deficiency.
Secondly, early prevention of leaf disease occurs, melon seedling stage is prone to bacterial leaf blight, blight, etc. It is recommended that farmers' friends spray DT500 times mixed with chlorothalonil 600 times prevention, spray once every 7 days. Again, avoid leaving leaves and leaves large, but should leave more leaves and leaves should not be large. The expert technician pointed out that the leaf area of ​​a muskmelon can not be less than 7000 square centimeters, so as to ensure the high quality and high yield of melon, it is recommended that the vegetable farmers in the melon production process, the main vine grows to 15 leaves, the melon is long, long Head to 25 leaves, when the vine grows to 20 leaves. Finally, timely application of nutrient foliar fertilizer such as chitin and alginic acid to supplement the deficiency of root fertilization, provide various essential elements for plant growth, and improve the disease resistance of the leaves.
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