Abstract
Parthenium hysterophorus L. (parthenium weed) is a destructive invasive weed in agroecosystems of >45 countries. Chemical control is highly effective and economical against parthenium among various weed control strategies. This two-year field study was carried out to evaluate the effectiveness of five herbicides applied 25 days after parthenium emergence viz., atrazine 80WDG at 360 g a.i. ha-1 , atrazine + S-metolachlor 720SC (320:400) at 720 g a.i. ha-1 , bromoxynil + MCPA + metribuzin 720EW (20:20:7) at 470 g a.i. ha-1 , atrazine + nicosulfuron 22SC (2.5:19.5) at 385 g a.i. ha-1 and dicamba 40.6AS at 304.5 g a.i. ha-1 . Application of bromoxynil + MCPA + metribuzin provided 100% control. Dicamba was the second most effective herbicide with the lowest parthenium dry weight (2.9 to 9.7 g m-2 ) and its uptake of N (1.5 to 4.5 kg ha-1 ), P (0.16 to 0.66 kg ha-1 ) and K (1.0 to 3.9 kg ha-1 ). Herbicide applications increased maize grain yield by 23 to 138%. Bromoxynil + MCPA + metribuzin at 470 g a.i. ha-1 showed superlative performance by achieving the highest grain yield (9.51 t ha-1 ). This herbicidal mixture was proved to be the most efficient and economical for parthenium control as it exhibited the highest marginal rate of return (706 to 750%). It is recommended that Bromoxynil + MCPA + metribuzin at 470 g a.i. ha-1 should be used for controlling parthenium in maize crop.
Muhammad Ehsan Safdar, Asif Tanveer, Muhammad Ather Nadeem. (2021) EVALUATING SUITABLE CHEMICAL OPTIONS TO MANAGE Parthenium hysterophorus L. IN AUTUMN PLANTED MAIZE, Pakistan Journal of Agricultural Sciences, Volume 58, Issue 3.
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