大白菜、黄瓜是我国主要蔬菜品种之一,其产量和品质直接影响到全国菜蓝子工程的实施。目前生产中存在的突出问题是氮化肥用量过大,三要素比例失调,不仅限制了产量的提高,同时亦导致病害多发,品质下降。如何计算氮化肥合理用量,已成为生产中亟待解决的重要问题。为此,我们于1991～1992年,以大白菜和黄瓜为试材,分别对田间试验法、测土施肥法和施肥比(施入养分量/吸收养分量)法 Chinese cabbage and cucumber are one of the main vegetable varieties in our country. Their yield and quality have a direct impact on the implementation of the national vegetable basket project. At present, the outstanding problems in production are the excessive use of nitrogenous fertilizer and the imbalance of the three factors, which not only limit the increase of output but also lead to the frequent occurrence of diseases and the decline of quality. How to calculate the rational use of nitrogen fertilizer has become an important issue to be solved urgently in production. For this reason, we used Chinese cabbage and cucumber as experimental materials from 1991 to 1992, and compared the field experiment, soil testing and fertilizer application ratio (applied nutrient content / nutrient absorption)