What is the reason for the yellow leaves of melon?

The appearance of yellow leaves in the planting process of muskmelon is a common phenomenon, which will affect the overall yield of muskmelon, resulting in a great decline in the quality of muskmelon, if not managed properly, it will also affect the sweetness of muskmelon. So why do the leaves of melons turn yellow? Let's get to know each other with the editor.

1. Element deficiency

Muskmelon needs a variety of nutrients during growth, and the main reason for muskmelon yellow leaves is lack of elements, nitrogen deficiency, phosphorus deficiency, potassium deficiency, calcium deficiency, iron deficiency, copper deficiency and magnesium deficiency will lead to leaf yellowing. And each deficiency symptom is also different, nitrogen deficiency leaves become yellow-green, old leaves dry and new small and few; phosphorus deficiency plants are short and dark green without light; potassium deficiency leaf margin first yellowing, gradually anxious, seriously causing the whole leaf to wither; calcium deficiency will turn yellow to the leaf margin, but the old leaves remain green; iron deficiency will make the leaves yellowish, but the veins are still green, and the whole leaves will lose green and fall off in the later stage. Copper deficiency will cause the green of the leaf tip to gradually fade; magnesium deficiency will cause the leaf color to turn yellow, especially the leaf tip is the most obvious, but the leaf vein remains green.

2. Fertilizer damage

Similar to element deficiency, excessive fertilization during planting will lead to fertilizer damage to the plant, which is a common cause of yellow leaves. Especially after just fertilizing, or after spraying, generally in 1-2 days will appear yellow leaf phenomenon, and the area is larger, but also more common. The phenomenon of yellow leaves caused by fertilizer damage can be improved by watering or urea foliar fertilizer spraying can relieve the symptoms.

3. Climatic reasons

The yellow leaves of muskmelon also have something to do with the climate. Many farmers use black film mulching technology to increase ground temperature and speed up the growth of muskmelon, but in the period of high temperature and heat in summer, black film not only likes heat, but also prevents heat dissipation, so it will affect root growth and cause premature senescence of yellow leaves. In addition, long-term rainy days or canopy among plants will also lead to leaf yellowing, so we should pay attention to climate change during cultivation and make correct management.

4. Disease

In addition, the yellow leaf phenomenon is caused by the disease, in which the representative disease is bacterial leaf blight, which is more likely to spread than leaf spot, which mainly occurs in the environment of high temperature and humidity. When the disease occurs, the leaves appear yellow-brown disease spots, which gradually expand and converge, which will lead to a large area of withered spots in the leaves in the later stage, resulting in the normal photosynthesis of the leaves. Streptomycin can be sprayed at the initial stage of the disease, and azole fungicides can be mixed with thiobacillus copper or Longke bacteria in the peak period of the disease.

The above is the introduction of the reasons for melon yellow leaves, hope to help you, want to know more related knowledge, please pay attention to us.