Author(s):

Luxmi Kant Tripathi, PK Patra, SK Ghosh and Arbind Kumar Gupta

Abstract: The laboratory investigation was undertaken during 2016-17 in BCKV, Nadia West-Bengal to study the effect of Silica and organic manure on sulphur availability in Alfisols soil collected from the Jhargram W.B. Five land use systems [Fallow, Forest, Upland growing vegetables, medium land growing rice-vegetables and lowland growing rice-rice,] were selected for the study. Soil samples were processed and kept in non-corrosive plastic containers and incubated for 120 days. Release of available sulphur in these soils was evaluated under application of silicon (0 and 50 kg ha^-1) and organic manure (0 and 7.5 t ha^-1). Fertilizer S was applied uniformly to all the pots @ 30 kg ha^-1 at the beginning of the study. The experiment was laid out in completely Randomized Design (CRD) with three replication and twenty treatments involving 60 pots in total. Treatments combinations for each of the Land use systems viz. T₀ (control), T₁-FYM 7.5 tha^-1, T₂-Si 50 kg ha^-1 and T₃-Si 50 kg ha^-1 + FYM 7.5 tha^-1. The result showed that the sharply increase the available sulphur content in the soils was observed during the first 30 days, it declined in the next 30 days (60 DAI) which increased again during the next 30 days (90 DAI) and then again decreased (120 DAI). The interaction effect among the land use system (LUS), silicon and FYM application throughout the period of incubation for 120 days. The lowest values of available sulphur content of the soil was recorded without application of either silicon or FYM in lowland soil and the values were 9.03, 8.60, 11.39, and 9.93 on the 30^th, 60^th, 90^th and 120^th DAI, respectively. It was interesting to note that excepting on the 30^th DAI, during the rest of the incubation period, the highest available sulphur content of soils was recorded with application of silicon without FYM in upland soil. The corresponding values of available sulphur were 35.25, 32.42, 48.63 and 33.00 on the 30^th, 60^th, 90^th and 120^th DAI. Available sulphur content of the soil pooled over 120 days of incubation ranged from 9.23 in lowland without application of silicon and FYM to 31.55 in upland soil with application of silicon and without FYM.

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