Integrated Sulphur Management in Rapeseed (Brassica campestris)-Blackgram (Vigna mungo) Sequence in an Inceptisol of Assam

A field experiment was conducted in three consecutive years during 2012–15 at Instructional cum Research Farm, Assam Agricultural University, Jorhat, Assam to assess the effect of integrated sulphur (S) management on soil fertility status and crop yields under rapeseed-blackgram sequence. The present study comprised of ten treatments, consisting of three levels of S either alone or in different combinations with farmyard manure (FYM), biofertilizer and lime. The results indicated that application of 30 kg S ha⁻¹ along with 50% recommended dose of NPK plus ¹/10 lime plus 2 t FYM ha⁻¹ produced the highest seed yield (10.1 q ha⁻¹ and uptake of N, P, K and S (74.0, 9.98, 59.3 and 12.3 kg ha⁻¹) by rapeseed, respectively and its residual effect was also found prominent in producing maximum grain yield (9.4 q ha⁻¹) and uptake of N, P, K and S (42.7, 5.06, 14.5 and 4.25 kg ha⁻¹) by blackgram, respectively. Organic carbon and available primary and secondary nutrient status were found to be highest in treatment receiving application of 30 kg S ha⁻¹ along with 50% recommended dose of NPK plus ¹/10 lime plus 2 t FYM ha⁻¹ and exhibited an improvement of 1.9 g kg⁻¹, 48.5 kg ha⁻¹, 3.6 kg ha⁻¹ and 5.3 mg kg⁻¹ of organic carbon, available N, P and S, respectively over initial value after harvest of three cycle of cropping sequence.