Vol. 9, Special Issue 10, Part S (2025)

An experiment was conducted on “Validation of fertilizer prescription equation evolved for Chhattisgarh dhan-1919 in a Vertisol” at research cum instructional farm IGKV, Raipur (C.G.) during Kharif season, 2024 with the three objectives: (1). To test the validity of fertilizer prescription equation evolved for rice var. Chhattisgarh dhan - 1919. (2). To estimate the nutrients uptake and use efficiency. (3). To calculate the benefit cost ratio under various treatments. The fertilizer prescription equation previously developed for rice (variety - Chhattisgarh dhan-1919) in Vertisol as FN = 4.72Y-0.70SN - 0.25ON, FP = 1.22Y-2.72SP-0.20OP and FK = 1.37Y-0.09SK 0.06OK were validated on research cum instructional farm IGKV, Raipur. The experimental field was laid out in randomized block design with four replications, consisting of six treatments as control (N₀P₀K₀), RDF ((N₁₀₀P₆₀K₄₀), STCR based dose for TY 55 q/ha (N₁₂₇P₁₈K₃₆), STCR based dose for TY 55q/ha with FYM (N₁₂₀P₁₆K₃₄+5 t/ha FYM), STCR based dose for TY 65q/ha (N₁₇₄P₃₀K₄₉) and STCR based dose for TY 65 q/ha with FYM (N₁₆₈P₂₈K₄₈+5 t/ha FYM). Treatment with STCR based dose for target yield 65 q/ha with 5 ton/ha FYM and treatment with STCR based dose for target yield 65 q/ha were recorded significantly higher grain and straw yield and also found statistically at par with each other’s. Treatment with STCR based dose for target yield 55 q/ha with 5 ton/ha FYM, treatment with STCR based dose for target yield 55 q/ha and RDF gave almost similar grain and straw yield and significantly higher than control. The grain yield received under treatments based on targeted yield 55 q/ha and targeted yield 65 q/ha were achieved with + 10% variations due to fertilizer application alone and along with 5 ton/ha FYM as per yield target, so its proved that the fertilizer prescription equations developed previously were valid for rice variety Chhattisgarh dhan - 1919 in a Vertisol.