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Dynamics of Sulphur Fractions in a Calcareous Vertic Haplustepts Under AICRP-LTFE Soils
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In case of sulphur status of LTFE soils, FYM played a vital role. It maintained availability of sulphur in soils, but more increment after a long run was observed in T11, where P source was SSP which contains 13% S. Total-S content of LTFE soils increased after a span of 8 years, but it was reversed in case of heat soluble-S, that was decreased after 8 years, except in treatments which received FYM and inorganic-P as a SSP (13% S). It was required to apply S fertilization every year and application of FYM for maintaining available status of soils at long run. Water soluble fraction of sulphur declined very much after 8 years of groundnut-wheat cropping sequence as compared to initial status, but it remained stable in treatments T4 and T11 which received sulphur from outside sources like ZnSO4 and SSP. Whereas organic-S status of LTFE soils increased after a span of 8 years, it might be due to incorporation of plant residues to the soils from crop ischolar_mains and stubbles. Sulphate-S in LTFE soils increased after 4th year and then remained stable except in T2 and T3 where depletion in this fraction was noticed perhaps due to the interaction with phosphorus. Non-sulphate-S fraction found significantly the highest in the treatments which received sulphur from outside as ZnSO4 and SSP (T4 and T11). In case of heat soluble-S, there was overall decrease in soil status after 4th year as compared to initial status and after word it maintained level with initial status, but in treatments of FYM and SSP it was increased as compared to initial status after 8th year of experiment. Whereas total-S status of LTFE soil increased after a span of 8 years. The increment was more in treatments which were received sulphur from fertilizer sources i.e. T4 and T11. It was required to apply S fertilization every year and application of FYM for maintaining available status of soils at long run. Depletion per cent of sulphur noted positive in case of water soluble-S and it was negative or very low in treatments which received sulphur from fertilizers i. e. T11 and T4. Most of the other fractions of sulphur were not depleted in most of the treatments.
Keywords
AICRP-LTFE Soils, Sulphur Fractions, Total Sulphur, Organic Sulphur, Sulphate Sulphur, Water Soluble Sulphur, Heat Soluble Sulphur, Non-Sulphate Sulphur.
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