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Not AvailableA field experiment was conducted to study the effect of different organic manures along with chemical fertilizers on net photosynthetic rate, leaf area index, chlorophyll pigments and also nutrient uptake of FCV tobacco in irrigated Alfisols (Typic Ustochrept). The experiment was conducted during 2013-14, in split plot design with five main treatments, (no farm yard manure, FYM 5 t/ha, FYM 10 t/ha, Tata geo green(TGG) a sugarcane based organic manure, 1t/ha, TGG 2 t/ha) and four sub-plots (No RDF, 50% RDF, 75% RDF and 100% RDF) replicated four times. Results revealed that application of 100% and 75% RDF showed significantly higher net photosynthetic rate and chlorophyll pigments (a&b) over 50% RDF and control. Application of 10 t/ha FYM showed highest LAI compared to other organic manures at 60 and 95 days. Organic manures and their doses showed significant increase in nutrient uptake over control. Application of 100% RDF has recorded significantly higher N, P and K uptake at 60 and 95 DAP. Organic manures showed significantly higher total nitrogen and phosphorus and potassium uptake over control. FYM 10 t/ha showed higher nitrogen and phosphorus uptake over TGG. Application of fertilizers @ 100% RDF showed significantly higher total N,P and K uptake compared to other treatments. Based on the physiological parameters and nutrient uptake it can be concluded that among the sources, FYM 10 t/ha was superior to TGG. In the event of non-availability of FYM, TGG (1 t/ha) can be used as a source of organic manure.Not Availabl