In the early stage of melon growth, the leaf margin showed slight yellowing, and the order was first leaf margin, then the interlobular yellowing, the order was obvious; in the middle and late stages of fertility, the same symptoms as the above appeared in the middle lobe; The edge is dead, and as the leaves continue to grow, the leaves curl outward; the symptoms vary significantly between varieties.
Pay attention to the location of the symptoms of the leaves. If the symptoms of the lower and middle leaves may be potassium deficiency; in the early stage of growth, when the temperature is low, cover the cultivation (double-layer coverage), the gas has similar symptoms; the same symptoms, if they appear In the upper lobe, it may be calcium deficiency; potassium deficiency is rare in the early stage of growth, only occurs in the case of extreme potassium deficiency; carefully observe the initial symptoms, when the leaf margin turns yellow, most of it is potassium deficiency, and when the leaf margin remains green, It is likely to be magnesium deficiency.
Apply sufficient potassium fertilizer, especially in the middle and late stages of fertility, pay attention to potassium deficiency; the absorption of potassium by melon plants is 7 grams per plant, which is basically the same as the amount of nitrogen absorbed. It is necessary to consider the amount of fertilization; Organic fertilizers such as compost; if potassium is insufficient, the average potassium sulfate can be used in an amount of 3 to 4.5 kg per mu.
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