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Comparative evaluation of Ca chloride and Ca phosphate for extractable sulfur in soils with a wide range in pH

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Title Comparative evaluation of Ca chloride and Ca phosphate for extractable sulfur in soils with a wide range in pH
 
Creator Sahrawat, K L
Murthy, K V S
Wani, S P
 
Subject Soil Science
 
Description Deficiency of sulfur (S) is becoming widespread in the rainfed systems of India, and there is increasing need for diagnosing the deficiency. Calcium chloride and Ca phosphate are commonly used for extracting available S in soils. Because of cost and the ease of availability locally, we prefer using Ca chloride as an extractant over Ca phosphate, for extracting available S. However, there is paucity of data on the comparative evaluation of the two extractants to extract available S, especially in soils having a wide range in natural pH (from acidic to alkaline range). It is recognized that soil pH plays a dominant role in the adsorption-desorption and extractability of sulfate-S in soils. We compared the extraction of S by Ca chloride and Ca phosphate in 86 Indian soils having a wide range in pH (4.5 to 10.6). Sulfur in the extracts was determined by ICP-AES. Considering all the 86 soil samples tested, there was an excellent agreement between the values of extractable S determined by using the two extractants (r=0.96, p
 
Date 2009
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/508/1/JouPlNutAandSoilSci172_3_404-407_2009.pdf
Sahrawat, K L and Murthy, K V S and Wani, S P (2009) Comparative evaluation of Ca chloride and Ca phosphate for extractable sulfur in soils with a wide range in pH. Journal of Plant Nutrition and Soil Science, 172 (3). pp. 404-407.