Indices of Sulfur-Supplying Capacities of Upland Soils in North China

作     者：LIN BAO ZHOU WEI LI SHUTIAN and WANG HONG (Institute of Soil and Fertilized, Chinese Academy of Agricultural Sciences, SO Baishiqiao Road, Beijing 100081, China) 

作者机构：中国农业科学院土壤肥料所 北京 100081 中国农业科学院土壤肥料所 北京 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：1999年第9卷第1期

页      面：25-34页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：加拿大资助 加拿大硫磺所资助 瑞典国际科学基金(IFS)资助 

主　　题：soil available sulfur testing methods upland soils 

摘      要：Fifteen upland soils collected from the major arable areas in North China were used to assess the availability of soil sulfur (S) to plants in a pot experiment. Soils were extracted with various reagents and the extractable S was determined using turbidimetric method or inductively coupled plasma atomic emission spectrometry (ICP-AES), respectively. In addition, mineralizable organic S, organic S, N/S ratio, sulfur availability index (SAI) and available sulfur correction value (ASC) in soils were also determined. The S amount extracted by 1.5 g L-1 CaCl2 was nearly equivalent to that by 0.25 mol L-1 KCl (40 ℃), and both of them were slightly smaller than that by 0.01 mol L-1 Ca(H2PO4)2 solution, as measured by turbidimetric method or ICP-AES. The extractable S measured by turbidimetric method was consistently smaller than that by ICP-AES. All methods tested except that for organic S and N/S ratio produced satisfactory results in the regression analyses of the relationships between the amounts of S extracted and plant dry matter weight and S uptake in the pot experiment. In general, 0.01 mol L-1 Ca (H2PO4) 2-extracted S determined by ICP-AES or turbidimetric method and 0.25 mol L-1 KCl(40℃)-extracted S determined by ICP-AES appeared to be the best indicators for evaluation of soil available S.