Weed and Nutrient Dynamics in Maize as Influenced by different Weed Management Practices

Author: Kommireddy Poojitha*, M.T. Sanjay and K.N. Kalyana Murthy

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Abstract

The steadily increasing cost of manual weeding has increased the need for chemical weed control and the main concern is in finding a better herbicide that can outperform even manual weeding. A field study conducted during Kharif 2017 on the sandy loam soil of Bangalore to study the weed dynamics, maize yield, and nutrient uptake under different post-emergence herbicide treatments. Significantly lower density and dry matter of weeds was recorded with passing cycle weeder followed by hand weeding at 20 and 35 DAS followed by ready mix application of topramezone + dimethanamid-p at 570 g ha-1 at 20 DAS and tembotrione at 120 g ha-1 + stefesmero adjuvant at 2 ml L-1 of water at 20 DAS. Passing cycle weeder followed by hand weeding at 20 and 35 DAS recorded the lowest uptake of N, P and K by weeds and the highest uptake of N, P and K by maize crop followed by ready-mix application of topramezone + dimethanamid-p at 570 g ha-1 at 20 DAS and tembotrione at 120 g ha-1 + stefesmero adjuvant at

Keywords

Topramezone, Tembotrione, Dimethanamid-p, Nutrient dynamics and Nutrient uptake.