N. Jagathjothi, M. Mohamed Amanullah, K.S. Subramanian and G. Balasubramanian
Abstract
Pot culture and field experiments were conducted at the Common Effluent Treatment Plant (CETP), Dindigul, Tamil Nadu during kharif 2011-12 to study the efficiency of irrigating treated tannery effluent and domestic wastewater with amendments on nutrient uptake, soil fertility, yield and economics of cotton. The mixing proportion of 1:3 ratio (25% treated tannery effluent + 75% domestic wastewater irrigation) recorded higher nutrient uptake and available soil NPK content compared to other mixing proportions. Similarly, seed cotton yield was also higher in 1:3 ratio with yield reduction around 15% compared to normal water irrigation. Regarding amendments, gypsum application further positively influenced the performance of irrigation source on soil characteristics and crop yield. With respect to economics, irrigation with 25% TTE + 75% DWW without amendments recorded higher benefit cost ratio compared to other mixing proportions.