Evaluation of a soil test method and plant analysis for determing the sulphur status of alluvial soils |
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Authors: | K N Bansal A R Pal |
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Institution: | (1) Department of soil Science and Agricultural Chemistry, J.N. Agricultural University College of Agriculture, Gwalior, India;(2) Present address: Zonal Agricultural Research Station, Krishak Nagar, 492012 Raipur, M.P., India |
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Abstract: | Summary In a pot experiment with soils of Alfisol, Entisol, and Inceptisol orders, the relative yield of Egyptian clover (Trifolium alexandrinum L.) was significantly correlated with Morgan's reagent (N NaOAc+HOAc, pH 4.8)—extractable soil S (r=0.88), plant S (r=0.82), and plant N/S ratio (r=−0.77) suggesting suitability of
these tests for diagnosing S deficiency. Total plant S lower than 0.21 per cent, plant N/S ratio wider than 17, and extractable
soil S lower than 10 ppm were indicative of S deficiency, and were suggested therefore to be critical limits for these tests.
Nitrogen and S in plant proteins were in near constant ratio of 16 and were significantly correlated (r=0.99). Sixty one per
cent of 250 surface soil samples had less than 10 ppm extractable S and hence were deficient in S, suggesting a widespread
S deficiency in soils under study. Extractable soil S in all soil series was significantly correlated with electrical conductivity
and alkaline KMnO4-extractable N, but not with pH, organic C, and CaCO3. |
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Keywords: | Alfisol Egyptian clover Soil test S deficiency Trifolium alexandrium L |
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