Indices of Sulfur-Supplying Capacities of Upland Soils in North ChinaEnglish Full Text

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)

Abstract: 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.

Keywords：

soil available sulfur; testing methods; upland soils;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S155

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Indices of Sulfur-Supplying Capacities of Upland Soils in North ChinaEnglish Full Text

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)

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