Prevention and treatment of potassium deficiency in muskmelon

In the early stage of melon growth, the leaf margin appeared slight yellowing, first the leaf margin, then the interveinal yellowing, the order was very obvious; in the middle and later stages of growth, the same symptoms appeared near the middle leaves; the leaf margin withered and curled outward with the continuous growth of the leaves; there were significant differences in symptoms among varieties. Pay attention to the location of symptoms in the leaves, if the symptoms in the lower and middle leaves may be potassium deficiency; in the early growth stage, when the temperature is low and covered with cultivation (double-layer mulching), gas damage has similar symptoms; the same symptoms, if it occurs in the upper leaves, it may be calcium deficiency; potassium deficiency in the early growth stage is rare and occurs only when it is extremely deficient. After careful observation of the initial symptoms, when the leaf margin turns yellow, it is potassium deficiency, and when the leaf margin is still green, it is likely to be magnesium deficiency. Apply enough potassium fertilizer, especially in the middle and later stages of growth, pay attention to potassium deficiency; muskmelon plants absorb an average of 7 grams of potassium per plant, which is basically the same as nitrogen absorption, which should be considered in determining the amount of fertilizer application; apply adequate compost and other organic fertilizers; if potassium is insufficient, potassium sulfate can be used with an average of 3-4.5 kg per mu, once topdressing.