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在丘陵棕壤和平原潮土上设置田间试验。结果表明，高氮中钾有利于提高西瓜单产和增加单瓜重；高钾中氮有利于提高瓜瓤可溶性糖含量；中氮中钾有利于增加瓜瓤维生素Ｃ含量，中迟熟品种需肥量大于早熟品种。棕红壤上西瓜需氮量高于潮土，但是钾低于潮土。在潮土上，早熟品种Ｎ、Ｋ＿２Ｏ施用量分别为１７５．０和１３０．０ｋｇ／ｈｍ￣２，中迟熟品种分别为１９５．０和１５５ｋｇ／ｈｍ￣２；棕红壤上分别为１９５和１２０．０ｋｇ／ｈｍ￣２、２１５．０和１３０．０ｋｇ／ｈｍ￣２。
Field trials were conducted on hilly brown soil and plain tidal soil. The results showed that potassium in high N could improve the yield of single melons and increase the weight of single melon. High potassium and N could improve the soluble sugar content in melon. Larger than the early varieties. The water requirement of red watermelon was higher than that of alluvial soil, but potassium was lower than that of alluvial soil. On the Chao soil, the application rates of N and K_2O for the precocious varieties were 175.0 and 130.0 kg / hm ~ 2, respectively, and that of the late maturing varieties were 195.0 and 155 kg / hm ~ 2 respectively; on the brown red soil, they were 195 and 120 .0kg / hm ~ 2,215.0 and 130.0kg / hm ~ 2.