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Evaluation of some extractants for predicting soil sulphur availability to cowpea (Vigna unguiculata)

Indian Agricultural Research Journals

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Title Evaluation of some extractants for predicting soil sulphur availability to cowpea (Vigna unguiculata)
 
Creator PANDEY, R N
GIRISH, B H
 
Subject Cowpea; Sulphur; Soils; Chemical extraction methods; Correlation coefficient; Critical limit; Tissue sulphur content
 
Description The pot experiments were conducted for 2 years during 2001-02 using cowpea (Vigna unguiculata (L.) Walp) as test crop with 4 levels of sulphur (0, 10, 20 and 30 mg S/kg soil) in 25 soils representing 5 major soil orders (Entisols, Inceptisols, Alfisols, MoIlisoIs and Vertisols) ofthe country to assess the suitability of 14 extractants for establishing critical limit of available soil sulphur. The soils were extracted with 0.15°AJ CaClz.2H20, 500 n1g P/litre Ca(H2P04)2' Wolf, Mehlich-2, Mehlich-3, Mehlicn-3 +charcoal, modified calcium chloride (0.15% CaCI2.2H20 +O.5MCH3COONH4+0.5MCH3COOH), 0.25 MKCI at 40°C, 0.25M KCl at 50°C, 0.25 MKCl at 50°C+ charcoal, 0.25 MKCI at 60°C, 0.25 MKCI at 60°C + charcoal, 500 mg P/litre KHzP04 and 0.125 MKCI + 0.075%CaCI2.2H20 at sOGe extractants. The soil sulphur content extracted by using 500 mg P/litre Ca(H2P04)2.HzO, Wolfand 500 mgPllitre KH2P04 did not correlate significantly with most of the biological indices ofcowpea, which indicated that these extractants are not suitable for predicting soil S availability to cowpea. On the basis of the magnitude of correlation coefficients with biological indices of cowpea, Mehlich-3 +charcoal was found to be most suitable extractant for cowpea followed by 0.25M KCl-40 and 0.25 MKCI-50 than other extractants studied with critical limits of 10.5, 12.0 and 10.6 mg S/kg soil respectively. The critical concentration of sulphur at 60 days old cowpea plants was found to be 4110 mg S/kg on dry weight basis. 
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2011-01-05
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2678
 
Source The Indian Journal of Agricultural Sciences; Vol 76, No 3 (2006)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2678/792
 
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