Abstract:

【Objective】 Effects of long-term application of sulphur-containing and chloride-containing chemical fertilizers on yield and its components of rice were studied in southern red soil. 【Method】 The concentration of SO42- and Cl- in paddy soil, and its relationship with yield of early and late rice were analyzed after long-term application sulphur-containing and chloride-containing, chemical fertilizers using the statistical method. 【Result】 The concentration of SO42--S in paddy soil increased first and then decreased later after long-term application of sulphur-containing chemical fertilizers, and total yield of early and late rice were showed a negative correlation with concentration of SO42--S significantly. The average yields of early rice (1982-2008) were 5 738.9, 5 657.5, 5 633.8 kg?hm-2, and the yields of late rice were 4 831.9, 4 603.8, and 4 557.0 kg?hm-2, respectively, after long-term application of Cl-, Cl-+SO42-, SO42-fertilizers. The yield was the highest under Cl- treatment. Yield of rice in SO42- treatment declined rapidly after 15 years of fertilization and was less than that of Cl- treatment significantly, but increased slowly after 2000, and the yield of the three treatments showed no significant difference. The concentration of SO42--S maintained 26.50 mg?kg-1, and the symptom of sulphur lack did not appear. 【Conclusion】 The concentration of SO42- was accumulated easily in southern hilly area paddy soil after long-term application of sulphur-containing fertilizers, which resulted in the risks of rice growth, the effects of long-term application of chloride-containing fertilizers was better than sulphur-containing fertilizers.

Key words: rice, long-term fertilization, sulphur-containing fertilizers, chloride-containing fertilizers, yield, component