The effects of application of nitrogen and potassium fertilizers on available nutrients,water-soluble salt in soil and the growth of tomato were studied with an pot experimental method.The results showed that the contents of NO-3-N,available K,and water-soluble salt in soil were significantly increased as the increasing addition of N and K fertilizers.And there were significantly linear relationships between soil NO-3-N and rate of N fertilizer added,available K in soil and rate of K fertilizer added.Additi...