Analysis of the Causes of Yellow Leaves in Rice and Detailed Explanation of Control Methods
During the growth of rice, yellowing of the leaves is a common phenomenon, and many farmers encounter this situation. There are many causes of yellow leaves in rice. Below, the editor has summarized them and brings you the causes of yellow leaves in rice and control methods. Let's take a look together.
1. Toxic yellow leaves
Yellowing of rice leaves caused by toxicity is actually quite easy to judge. From the root system, the symptom of blackened roots is extremely obvious, and there is also a smell of rotten eggs, which is extremely distinct.
Control method: For toxic yellowing of leaves, drain the field and sun-dry it in time. The purpose is to let the soil obtain more oxygen and detoxify through oxygen, then apply compound fertilizer or spray foliar fertilizer to promote the rice to turn green again.
2. Yellowing due to nitrogen deficiency
When rice leaves turn yellow, many people's first reaction is that it is caused by nutrient deficiency. Indeed, when rice lacks nitrogen, it will cause yellow leaves in rice. It is also relatively easy to judge. Generally, the old leaves begin to turn yellow first, gradually spreading to the heart leaves, and then gradually spreading to the whole plant. Seen from a distance, it looks as if the rice has ripened.
Control method: For yellowing of leaves caused by nitrogen deficiency, topdressing urea is sufficient. It is recommended to start topdressing at the early stage of yellowing, and not wait until the whole plant turns yellow before topdressing, as by then it is already too late.
3. Herbicide phytotoxicity
Phytotoxicity caused by herbicides can also cause yellow leaves in rice. In mild cases, yellow spots appear on the leaves, and then the rice withers and wilts. In severe cases, the entire plant dies, which is typical herbicide phytotoxicity.
Control method: If herbicide phytotoxicity is discovered earlier, spray clean water as soon as possible to reduce the herbicide concentration. If it is discovered relatively late and the rice has already withered, then there is no saving it.
4. Bacterial diseases
There are many bacterial diseases that can cause yellowing of rice leaves, such as bacterial leaf blight, bacterial leaf streak, bacterial foot rot, etc. After infection, the heart leaves of the rice will wilt and curl. If it is bacterial leaf streak, breaking the diseased plant will produce yellow “bacterial ooze”. If it is bacterial foot rot, breaking the diseased plant will produce a foul, rotten smell.
Control method: It is not difficult to control bacterial diseases. Agents such as ye kuzuo, agricultural streptomycin sulfate, and thiosen copper can be sprayed for control, generally once every week.
The above is an introduction to the causes of yellow leaves in rice and control methods. We hope it can help you. To learn more related knowledge, please stay tuned to us.