天津市土壤硫素状况的系统诊断研究

采用土壤养分状况系统研究法 ,通过室内分析、吸附实验、温室盆栽和田间试验对天津市农田土壤的硫素状况进行了系统研究。结果表明 ,76 %的土样有效硫含量超过临界值 ,缺硫和潜在缺硫土壤占 2 4 % ;不同土壤对硫的吸附差异较大 ,应针对不同吸附特性推荐施肥 ;温室盆栽和田间小区试验结果证实 ,土壤缺硫在部分区县是造成农作物减产的重要因素 ,硫肥投入已成为这些地区增产的必要措施之一

Systematic Study on Soil Sulphur Status in Tianjin Areas

Studies were carried out on soil sulphur status of 50 soil samples from Tianjin areas by Systematic Approach of Soil Nutrent Status which includes routine analysis,sorption study and greenhouse survey and field confirm.Results indicated that 76% of the total soil samples had much higher available sulphur contents than the critical level,24% lower than that.Sorption study showed that there was a great difference in sulphur adsorption among soils and application of fertilizer sulphur adsorption.Greenhouse survey and field experiments ratified that sulphur had became a limiting factor and application of fertilizer sulphur was necessary for further yield increase in some soils.