Effect of sulfur fertilizer on increasing vegetable yield and decreasing accumulation of NO~(-)_(3)

The analyzed results of 23 vegetable superficial soil samples showed that total S content in soil was 354. 9 mg·kg-1 and available S content was 26. 2 mg·kg-1. The content of available S in 43. 6% samples was lower than critical value (16 mg·kg-1) and available S accounted for 7.4% of the total S. The experiment results showed that yields of Lactuca satiua and Brassica oleraclai increased by sulfur fertilizer at the dosage of 15-60 kg·hm-1. Sulfur nutrient could also improve vegetable quality and decrease accumulation of NO-3. The NO-3 content in the center part of Lactuca satiua, Brassica oleraclai and swamp cabbage decreased by 13.0%-56. 0%, 24.8%-48.7% and 8. 2 %-56. 0% respectively compared with the control. The NO-3 content in plant of swamp cabbage and litter cabbage applied sulfur fertilizer at pot experiment or liquid experiment in net house decreased more than that in field experiment.