Nowadays, when many vegetable farmers are planting vegetables, they often do not pay much attention to some small diseases. For example, the disease of cucumber yellow edge, and then take a look at this small series.
There are many greenhouses where cucumbers are grown, and the leaves are yellow and dry. Many farmers are not very concerned, but the internal causes of this small symptom are diverse. If you don’t understand clearly, you don’t pay enough attention. Cause big problems and affect production. Today we interpret several reasons for this phenomenon for your reference and symptomatic solution!
Soil salinization. Salinization is the biggest cause of yellowing of cucumber. After salinization of the soil, the cucumber caused yellowing from top to bottom. Excessive levels of nitrogen and potassium ions in the soil lead to soil salinization, which inhibits the movement of various elements in the soil. At the same time, if the salt concentration is too high, the root cells will be separated from the plasmolysis, which greatly inhibits the absorption of other trace elements, such as boron and iron, thereby causing yellowing of the leaves.
Excessive potassium application or soil potassium deficiency. Potassium deficiency is rare, and yellowing caused by excessive potassium is the most common. After many cucumber farmers enter the fruiting period, they habitually increase the amount of potassium fertilizer, and the excessive potassium accumulation in the soil directly triggers the yellow edge. At the same time, it inhibits the trace elements in the soil and indirectly causes the yellow edges.
Calcium deficiency. The yellowing caused by calcium deficiency occurs mostly in the young part of the plant. Generally, the leaf margin of the young leaves appears relatively uniform yellow edge, and in severe cases, it will expand to the inside. Due to soil drought or excessive watering, the roots of cucumber are injured, which affects the absorption of calcium by roots. A large amount of chemical fertilizer is used, and the content of nitrogen and potassium in the soil is too high, which antagonizes calcium and reduces the absorption of calcium.
Drug damage. Most of the phytotoxicity is caused by the middle and lower leaves. At the beginning, the leaf edge turns yellow, and the leaf edge is burnt at the later stage. In order to prevent diseases, many vegetable farmers basically spray a drug for prevention every few days. Some measures to prevent fumigation in order to prevent the humidity in the shed. If the time is long or the application is large, the edge of the blade will turn yellow.
Gas damage. Improper application of fertilizer, resulting in ammonia poisoning, sulfur poisoning, resulting in yellowing.
What do you think about the reasons for the yellow edges? Did you find that if left unchecked, there is a big hidden danger to the growth of cucumber. Therefore, it is necessary to analyze the causes and strengthen the management in order to prevent the deterioration of the cucumbers after the yellow edges appear, so that the pests and diseases can be degraded and cause greater losses!
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