Effect of weed control and sulphur on yield of Indian mustard (Brassica juncea) and their residual effect on summer greengram (Phaseolus radiatus)

An experiment was conducted during 1993-94 and 1994-95 to study the effect of weed control and sulphur levels on yield of Indian mustard [Brassica jun cea (L.) Czernj. & Cosson] and their residual effect on succeeding summer g reengram (Phaseolus radiatus L.). All weed-control practices resulted in si gnificantly reduced density and dry matter of weeds infesting crop of India n mustard. Pre-emergence application of oxadiazon 0.5, oxyflurofen 0.125 pe ndimethalin 0.75, isoproturon 0.5 kg/ha and hand-weeding 30 days after sowi ng increased seed yield by 72.3, 59.6, 55.3, 45.7 and 59.6% during 1993-94 and by 67.4, 55.6, 50.0, 42.4 and 55.6% during 1994-95 over the weedy check (9.4 and 10.6 q/ha respectively). Application of sulphur @ 60 kg/ha increa sed the seed yield by 22.9 and 29.7% over the control (12.2 and 12.8 q/ha) during 2 years. Weed dry matter at 30 days, yield attributes and yield of s ucceeding summer greengram crop remained unaffected by weed-control practic es of preceding crop. Application of 60 kg S/ha to Indian mustard resulted in 19.3 and 30.0% increase in yield of succeeding greengram over the contro l (9.25 and 8.29 q/ha).