Residual effect of sulphur and boron fertilization as influenced by liming on yield and yield attributes of summer greengram under rapeseed-greengram cropping sequence

The field experiment was conducted to study the effect of S and B under limed and unlimed condition on yield and its attributes on rapeseed and its residual effect on summer greengram in sandy loam soil during rabi and summer seasons of years 2017-18 and 2018-19 at Instructional farm of Krishi Vigyan Kendra, Udalguri, Assam Agricultural University, Assam. The experiment was laid out in randomized block design with factorial concept, comprising 4 treatment combinations of S and B ((S₀B₀, S₁₅B_0.75, S₂₀B_1.0 and S₂₅B_1.25 kg ha^-1) and two factors (limed and unlimed) with three replications. Sulphur and B were applied to rapeseed as a basal along with recommended dose of fertilizer (40:35:15::N:P₂O₅:K₂O kg ha^-1) and the residual effect of treatments was studied in summer greengram crop which too received recommended dose of fertilizers (N:P₂O₅:K₂O::15:35:0 kg ha^-1) without S, B and lime. The residual effect of applied S, B and lime @ 20 kg S + 1.0 kg B + 490 kg lime ha^-1 resulted significantly highest LAI (4.41), plant height (36.99 cm), dry matter yield (314.55 g m^-2), pod plant^-1 (25.65), seed pod^-1 (10.24), test weight (26.90 g), seed yield (8.74 q ha^-1) and stover yield (49.38 q ha^-1) of greengram. Under unlimed condition, the treatment 20 kg S + 1.0 kg B ha^-1 showed 15.23% and 23.84% increase in seed and stover yield over control and in limed condition, the same treatment recorded 5.17% and 39.89% increase in seed and stover yield over control.