Vol. 11, Issue 12 (2022)

The experiment was laid out in split – split plot design with main, sub and sub-sub plots with direct seeded rice–black gram cropping sequence. The main plot comprised of two levels of fertilizers viz., F₁- 100% RDF andF₂- 75% RDF, the sub plot comprised of two doses of pigeon pea bio char viz., B₁ – Bio char @ 5 t ha^-1, B₂ – Bio char @ 7.5 t ha^-1, B₃ - Paddy straw @ 5 t ha^-1 and B₄- Green leaf manure @ 6 t ha^-1 and the sub-sub plot comprised of two levels of humic acid viz., S₁ - Humic acid @ 20 kg ha^-1 and S₂ - Humic acid @ 30 kg ha^-1 and replicated thrice.

The results of this study showed that, significantly higher iron and manganese contents in plant was recorded with the application of B₄- Green leaf manure @ 6 t ha^-1 and S₂ - Humic acid @ 30 kg ha^-1 at all the growth stages of direct seeded rice, whereas, the higher zinc (except in panicle initiation stage) and copper content was significantly recorded with application of B₄- Green leaf manure @ 6 t ha^-1 only. However, the zinc content in panicle initiation stage significantly influenced by the application of B₄- Green leaf manure @ 6 t ha^-1 and S₂ - Humic acid @ 30 kg ha^-1. Significant interaction effect was observed between B₄ – Green leaf manure @ 6 t ha^-1 and S₂ – 30 kg ha^-1 (B₄S₂) in manganese content at active tillering and panicle initiation stages of kharif direct seeded rice during two years of study.