Abstract: Twenty-one different kinds of vegetable crops were planted on two plots for 11years. Long-term fixed experiments for the 11-year continuous application of ammonium chloride were carried on two plots. The results indicated that soil pH decreased by 0.42-0.45 unit compared with the starting value after 11 years of application of ammonium chloride. There was a high negative correlation between soil pH and soil chloride content in 0-20 cm depth soil layer in chloride-contained fertilizer treatment. No correlation between soil pH and soil chloride content in the non chloride-contained fertilizer treatment was found. Total 9 702 kg·ha-1 chloride were input within 11 years for 20 crops but 76.6% and 74.7% of total input chloride were leached under 60 cm depth soil layer in two experiments, respectively. The 17.2% and 18.1% of total input chloride，respectively, were taken away by vegetable crops. The chloride residue rates were 6.2% and 7.2% in 0-60 cm depth soil layer, respectively. Soil chloride contents were much higher in treatments of ammonium chloride than in treatments of non chloride-contained fertilizer. The varied range of chloride contents in the topsoil was large especially in the salt accumulative period in different years. Most of the soil chloride contents were under 100 mg·kg-1 and the varied range was small in the treatments of no chloride-contained fertilizer in 11 years. There was no increasing trend of chloride ion in the soil with the increased ammonium chloride application year by year.

Key words: Ammonium chloride, Vegetable, Chloride ion, Soil pH, Chloride residue