Rice yellow leaf disease generally occurs after the rice has reached its peak stage. Some of them can recover by themselves and have little effect on rice. Some of them continue to the heading stage, causing difficulty in heading and seriously affecting yield. The reasons are as follows:
1, cold rotten rice yellow leaf disease. The main reasons are poor drainage, poor root development, low reductive substances, low soil temperature, and poor ventilation, resulting in poor plant growth and yellow leaves. The solution is mainly to reduce the groundwater level by flood ditches, adopt ridge cultivation methods, and use semi-dry cultivation to reduce the impact. Increase the use of minerals rich in magnesium, potassium, calcium, zinc and other minerals, fertilizers such as grass and wood ash.
2, lack of rice yellow leaf disease: a variety of elements can be expressed in the absence of yellow leaves, a large number of elements in nitrogen, potassium deficiency; lack of magnesium in the elements, iron, sulfur, boron; trace elements in the lack of manganese can cause yellow Leaf disease. The lack of symptoms of various elements of yellow leaves vary, the production is also simple, what lacks what to add.
3, climatic factors: generally more common in late-middle rice, performance in the post-harvest period, when the young panicle differentiation, the plant automatically adjusts, from the vegetative growth into the reproductive growth process of the natural performance of the general indica rice varieties and part of the temperature More sensitive species are more common. In addition, when the temperature difference between day and night is too large, dragons in the relatively high altitude areas are obvious. This type of performance is 5-7 days, after which it can naturally return to normal and does not require management. For rice that is partially over-represented and difficult to recover, foliar fertilizer containing amino acid chelates can be sprayed.
4, comprehensive yellow leaf disease: Some of the rice fields to take the above methods are not effective, available copper sulfate, mu with 3-4 kg with magnesium sulfate 10-15 kg, the effect of the application is good.
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