There are many friends of peanut growers who have encountered such doubts. It is not long before the peanuts are planted. The leaves begin to turn yellow, and there is even a dry phenomenon. Is this what happened? What is the original cause? Let's learn together to learn about it.
Herbicide
When spraying herbicides, due to improper usage, improper dosage or unfavorable weather conditions, it is very likely to cause phytotoxicity. This situation is also easy to judge. If the herbicide is sprayed, the yellowing of the leaves appears in a few days. If everything is normal before spraying, it is basically possible to judge the cause of the herbicide phytotoxicity (not to exclude special circumstances). For the herbicide phytotoxicity, according to the degree of damage, water can be sprayed, and then gibberellic acid and brassinolide can be sprayed. Or foliar fertilizer to ease.
2. deficiency
The yellowing of the leaves can not rule out the cause of deficiency. For example, in the absence of nitrogen, the obvious feature is that the leaves are yellow. However, before the planting, everyone will apply the base fertilizer. Therefore, the peanuts have not emerged for a long time, and the probability of nitrogen deficiency is not very large. However, it does not rule out the absence of a base fertilizer. In response to this situation, urea is applied to relieve.
3. Drought
In the case that the field is not too dry and too dry, the peanuts can not absorb enough water, and the leaves will appear yellow due to dehydration. This kind of good judgment, I believe that we don’t need to say that everyone understands, timely irrigation and watering, the leaves will Slowly return to green.
4. Underground pests
The damage of underground pests causes damage to the roots of peanuts, hindering the transmission of nutrients and water, and also causes yellowing of peanut leaves. It is also good to judge, open the soil, check the roots of peanuts, have traces of biting by underground pests, or have There is no underground pests to appear, for this, it is generally prevented by seed dressing before sowing.
5. Root knot nematode
Root knot nematode disease is more likely to occur in peanut seedling stage. One obvious feature is that the leaves appear yellow. When the seedling stage is infected, the plants shrink a little, the lower leaves turn yellow, and sometimes the leaves are at the edges. For root-knot nematode disease, it can be used for prevention and treatment by using chlorpyrifos, imixin and chlorpyrifos.
The above is the common reason for the five-point yellowing of the peanut seedlings. The peanut growers should pay more attention to these problems in the usual time, so as not to happen again next time.
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