Author(s):

Suraj Mali, Sanjay Tiwari and Vipin Kumar

Abstract: A field experiments were carried out during two Kharif seasons 23^th June 2018 to 28^th November 2018 and 23^th June 2019 to 28^th November 2019 at ICAR - Indian Agricultural Research Institute, Sub Regional Station and front of Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur), Bihar. A field experiment laid out in split plot design with four treatment T₁ - Control, T₂ - Gypsum @ 100% G.R., T₃ - Gypsum @ 50% G.R. + Biocompost @ 2.5 t ha^-1_, T₄ - Biocompost @ 5.0 t ha^-1 in main plots and ten genotypes G₁ - Suwasini, G₂ - Rajendra Bhagwati, G₃ - Boro-3, G₄ - Rajendra Neelam, G₅ - CSR-30, G₆ - CSR-36, G₇ - CR-3884-244-8-5-6-1-1, G₈ - CR-2851-SB-1-2-B-1, G₉ - CSR-27, G₁₀ - Pusa-44 in sub plots and replicated in thrice. Our objective was to study how the effect of amendments on macronutrient uptake in various rice genotypes. The experimental site has hot and humid summers and too cold winters and soil belong to order Entisol, silt loam in texture at surface containing 10.45% sand, 72.06% silt and 17.49% clay the soil was alkaline pH 9.69 in reaction, electrical conductivity 2.12 dS m^-1 and organic carbon 2.6 g kg^-1. Application the recommended dose of N: P₂O₅: K₂O @ 120: 60: 40 in the form of urea, diammonium phosphate (DAP) and muriate of potash (MOP). Fifty per cent of N, and full doses of P₂O₅ and K₂O were applied as basal and the rest fifty per cent of N was applied in two splits at 30 days interval and application of inorganic and organic amendment separately in treatment T₂ (Gypsum @100% G.R. in 2.5 kg plots^-1) and T₄ (Biocompost @ 5.0 t ha^-1 in 5 kg plots^-1) and both inorganic and organic combined application in treatment T₃ (Gypsum @50% G.R. in 1.25 kg plots^-1 + Biocompost @ 2.5 t ha^-1 in 2.5 kg plots^-1). The same treatment is applied on the same plots. The treatment was applied in 2018-19. The organic soil amendments viz., biocompost were provided by Magadh Sugar & Energy Limited Unit - Hasanpur Sugar Mills, Samastipur (Bihar). The results obtained from the present investigation revealed that the N, P and K uptake in grain had significantly higher in the genotypes CSR-27 followed by CSR-36 and CR-3884-244-8-5-6-1-1 and combination of gypsum @ 50% G.R. and bio-compost @ 2.5 t ha^-1 application had significantly higher followed by gypsum @ 100% G.R. application and N, P and K uptake in straw had significantly higher in the genotypes CSR-36 followed by CSR-27 and CR-3884-244-8-5-6-1-1 and combination of gypsum @ 50% G.R. and bio-compost @ 2.5 t ha^-1 application had significantly higher than the control treatment.

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