The magnesium deficiency symptoms during the growth and development of melons, the surface of the inferior leaves is abnormal, and the green color between the veins gradually turns yellow and further develops. In addition to the leaves leaving a little green, the veins are yellowed. There are differences in the degree and symptoms between the breeds. In the early period of fertility, it is unlikely that magnesium deficiency will occur before squashing, and magnesium deficiency will not occur. It may be due to coverage and gas barriers in the protected area; attention should be paid to the position of the leaves where chlorosis occurs, if it is the upper leaves. Chlorosis may be due to other causes; leaves lacking magnesium do not curl up; if they are hardened, curling should be considered for other reasons. Symptoms occur on the inferior old leaves, resulting in lower leaf function, and when the nutrient is not sufficiently conveyed to the upper leaves, magnesium deficiency occurs on the upper leaf of the upper leaf. The symptoms of magnesium deficiency are similar to the symptoms of potassium deficiency. The difference is that magnesium deficiency is from The inside of the leaf is chlorogenic; the lack of potassium begins with chlorosis from the leaf margin.
The reason is that the amount of magnesium in the soil is low. For example, in the open soil cultivation without magnesium on sandy soil or sandy loam soil, magnesium deficiency disease is easy to occur; excessive use of potassium and nitrogen fertilizers hinders the absorption of magnesium.
Remedy Before the cultivation, apply enough magnesium fertilizer, pay attention to the content of potassium, calcium, etc. in the soil, keep the proper salt-based balance of the soil, avoid excessive application of potassium, nitrogen, and other fertilizers that absorb magnesium. The emergency solution is to spray the foliage with 1% to 2% magnesium sulfate solution.
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