安徽省望江县油菜田土壤有效硫状况及硫肥效应

Soil Available S in Wangjiang County of Anhui Province and Response of Rapeseed to S Fertilizers

选择长江流域油菜主产区望江县研究安徽省土壤有效S状况和油菜施用S肥的效应.结果表明,望江县土壤有效S平均含量15.31 mg/kg,缺S状况较为严重,缺S土壤所占比例高达61.29%,潜在性缺S土壤所占比例为35.48%.主要土壤类型中灰潮土缺S状况最为严重,有效S不足的土壤所占比例高达80%.在有效S极为缺乏的灰潮土上,油菜施用S肥具有极为显著的增产效果,与施尿素的对照相比,盆钵栽培增产1O.89%～26.21%,田间试验产量提高9.42%～16.43%,平均增产15.80%和13.29%.

Rapeseed production region in the Yangtze River valley of Anhui Province was selected to study soil available S and the response of rapeseed yield to S fertilizers. Results showed that average content of soil available S was 15.31mg/kg, insufficient seriously. About 61.29% and 35.48% of the total soil area were of S-insufficient and potential S-insufficient, respectively. Among the main important soils, gray-alluvial meadow soil was of the most S-insufficient, about 80% of this soil area was of S-insufficient, this soil showed a remarkable response of rapeseed yield to S fertilizers. Compared with CK (only urea applied), rapeseed yield with S-fertilizers increased by 10.89% ~ 26.21% with a mean of 15.80% in the pot experiment and 9.42% ~ 16.43% with a mean of 13.29% in the field experiment.