一、喷乙烯利在西瓜采收前7～10天，瓜面喷200～300mg／kg的乙烯利水溶液，既可以增加西瓜的甜度，又可以促使西瓜提早成熟。二、增施磷钾肥在西瓜结瓜初期，每亩叶面喷施0．2～0．3％的磷酸二氢钾250g，加水80kg，连续喷2～3次或每亩施30kg的磷酸钙，均可增加甜度。西瓜增甜新 First, spraying ethephon 7 to 10 days before the watermelon harvest, melon spray 200 ~ 300mg / kg ethephon aqueous solution, both to increase the watermelon sweetness, but also can promote the early maturation of watermelon. Second, the increase of phosphorus and potassium fertilizer In the early watermelon knot, foliar application of 0.2 ~ 0.3% potassium dihydrogen phosphate 250g, add water 80kg, spraying 2 to 3 times or spraying 30kg per acre of calcium phosphate , Can increase the sweetness. New watermelon sweetened