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Indian Journal of Agronomy
Year : 2012, Volume : 57, Issue : 3
First page : ( 255) Last page : ( 258)
Print ISSN : 0537-197X. Online ISSN : 0974-4460.

Bio-efficacy and economics of herbicide mixtures in zero-till maize (Zea mays) grown after rice (Oryza sativa)

Reddy M. Malla*Senior Scientist, Padmaja B., Scientist, Veeranna G., Scientist, Reddy D. Vishnu Vardhan, Associate Director of Research

Regional Agricultural Research Station, Acharya N.G. Ranga Agricultural University, Warangal, Andhra Pradesh-506 007

*Corresponding author Email: maduri_agron@yahoo.com

Online published on 11 March, 2013.

Abstract

A field experiment was conducted at Warangal, Andhra Pradesh during 2008–09 and 2009–10 to study the effect of pre-emergence application of herbicides viz. atrazine, glyphosate, paraquat and 2, 4-D sodium salt in zerotill maize (Zea mays L.) grown after rice (Oryza sativa L.) as sole and tank mixtures. The lowest density (no/m2) and dry weight (g/m2) of grasses (1.0 and 1.0, respectively), sedges (9.0 and 2.0, respectively) and broad- leaved weeds (1.0 and 0.5, respectively) were observed with the tank mix application of atrazine + glyphosate (0.75 + 0.8 kg/ha) recorded at 30 days after sowing. It was at par with atrazine + paraquat (0.75 + 0.75 kg/ha). The weed control efficiency was high with atrazine + glyphosate (93%) with the lowest weed persistence index (0.003) followed by atrazine + paraquat (84% and 0.021, respectively). Among the herbicides applied alone, glyphosate (1.6 kg/ha) was found to be superior to atrazine (1.5 kg/ha) and paraquat (1.5 kg/ha) for density, dry weight of weeds and weed-control efficiency. The grain yield obtained with tank mix application of atrazine + glyphosate (5.25 t/ha) was 170 and 70% more over weedy check and sole atrazine, respectively. Among all the herbicides and mixtures, atrazine + glyphosate gave the maximum net returns ( 29,350/ha) and benefit: cost ratio (1.71) followed by atrazine + paraquat due to the broad - spectrum control of weeds.

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Keywords

Bio-efficacy, Herbicide, Rice-fallows, Tank mixtures, Weed control efficiency, Zero tillage.

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