Watermelon lacks potassium, plant growth is slow, stem vines are weak, leaf surface is wrinkled, old leaves edge brown and dead, and gradually expand inwards, when serious, it will develop to the heart, making it become light green, and even leaf margin Scorch appears. The fruit setting rate is very low. The melons that have been sitting are small and have a low sugar content. Remedial measures: First, use 5-10 kg of potassium sulfate per mu (for potassium deficiency at the seedling stage, 3-5 kg ​​per mu; 8-10 kg per mu after extending vines) or 30-60 kg of vegetation ash. It is sprayed with 0.4%-0.5% potassium sulfate solution. Ppe Nitrile Gloves,Aql4.0 Industrial Gloves,Ppe Non-Medical Equipment,Disposable Powder Free Nitrile Gloves Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshihealths.com