Effect of sulphur sources and levels on yield, nutrient uptake and qualityof blackgram (Phaseolus mungo)

A field experiment was conducted during 1992 and 1993 to assess the effect of different sources of sulphur, viz. elemental sulphur, pyrite and gypsum, and levels of sulphur (0,30 and 60 kg/ha) on yield, nutrient uptake and qu ality of blackgram (Phaseolus radiatus L.), Among the sources of sulphur te sted, gypsum produced significantly higher pod length, seeds/pod, and 1,000 -seed weight. Sulphur application through gypsum, on an average, yielded 15 .7 and 7.7% more seed over elemental sulphur and pyrite respectively. The q uality of seed in terms of nitrogen, phosphorus, sulphur and protein were i mproved appreciably by the application of gypsum as a source of sulphur. Up take of N, P and S by blackgram was increased by gypsum application. Applic ation of 30 kg S/ha significantly increased the yield-contributing characte rs and yield of blackgram. The N, P and S contents were improved appreciabl y due to increasing levels of sulphur over no-sulphur application. Applicat ion of 30 kg S/ha enhanced protein content in 1992, however it was maximum at 60 kg/ha in 1993. Application of 30 kg S/ha also increased N, P and S up take by seed.