The causes and control methods of the latest yellow leaves of beans

Many farmers often appear the phenomenon of yellow leaves in the process of planting beans, whether the new leaves turn yellow or the old leaves at the bottom, if we do not take timely measures to prevent and control, the yield will be reduced, or even no harvest. Let's take a look at the causes and control methods of yellow bean leaves.

First, the cause of yellow leaves of beans

1. The new leaves turn yellow

Continuous rainy days lead to excessive air humidity or weak roots, too much fruit and other reasons, which will cause the yellowing and whitening of the new leaves at the top of the plant. At the same time, it also has a lot to do with iron deficiency and zinc deficiency, so timely spraying foliar trace fertilizer and timely maintenance of iron and zinc can effectively alleviate this symptom of the plant.

2. Leaf veins are yellowing.

The yellowing of veins will also occur in the middle and lower parts of the old leaves of the plant, but the trees will not die, and the yellowing of this situation is mainly caused by lack of magnesium, or weak planting growth, premature senility and improper management of fertilizer and water. If it is magnesium deficiency, it can be solved by foliar spraying magnesium fertilizer, but if the growth is poor, it is necessary to improve the regulation of fertilizer and water management.

3. The bottom leaves are yellowing

In general, when the bottom leaves turn yellow, it may be caused by bean root rot. The initial symptoms of root rot are not significant and will not appear until the flowering and podding stage. It shows that the plant is short, and the lower leaves turn yellow and dry from the leaf edge, but generally do not fall.

II. Prevention and control methods

Attention should be paid to the application of base fertilizer, which is mainly organic fertilizer, and it is necessary to ensure the compensation of organic matter and trace elements, especially iron, zinc and magnesium, which will lead to yellow leaves. In the management to control the environmental temperature in the appropriate range, should not be too high, to ensure root development, regulate root growth, it is necessary to pay attention to the occurrence of root rot can be used 99% chlorpromazine 3000-4000 times root irrigation control.

The above is the introduction of the causes and control methods of yellow bean leaves. I hope I can help you. If you want to know more about it, please follow us.