EVALUATION OF NEW POST EMERGENT HERBICIDES AGAINST WEEDS AND THEIR EFFECT ON GROWTH AND YIELD OF MAIZE (Zea mays L.)
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Date
2018-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR - 584 104
Abstract
A field experiment was conducted during Kharif 2017 at new Farm of AICRP on weed management, MARS, UAS, Raichur to study the “Evaluation of new post emergent herbicides against weeds and their effect on growth and yield of maize (Zea mays L.)”. The experiment was laid out in RCBD with three replications and twelve treatments. The results of experiment revealed that, amongst broad leaved weeds, Euphorbia geniculata was the dominant one while in grasses, Brachiaria eruciformis was most prevalent and the lone sedge weed noticed was Cyperus rotundus. All weed management practices significantly reduced the total weed population and dry matter accumulation by weeds as compared to weedy check. Based on the results, it is concluded that sequential application of atrazine 50 % WP @ 500 g a.i. ha-1 (PRE) at 0-3 DAS fb tembotrione 34.4 % SC @ 125 g a.i. ha-1 (POE) at 30 DAS provided excellent control of all types of weeds at all stages of the crop growth, recorded higher weed control efficiency (79.54 %), higher nutrient uptake by maize plant at harvest, lowest nutrient uptake by weeds at 60 DAS, higher growth, yield, yield attributes and also recorded higher dehydrogenase, phosphatase activiry in soil at flowering stage with higher in N2 fixers, PSM, total bacterial count in rhizosphere soil and it was found to be on par with application of atrazine 50 % WP @ 500 g a.i. ha-1(PRE) at 0-3 DAS fb topramezone 33.6 % SC @ 75 g a.i. ha-1 (POE) at 30 DAS and atrazine 50 % WP @ 500 g a.i. ha-1 (PRE) at 0-3 DAS fb halosulfuron 75 % WDG @ 90 g a.i. ha-1 (POE) at 30 DAS. Higher B:C ratio (3.07) was obtained in atrazine 50 % WP @ 500 g a.i. ha-1 (PRE) at 0-3 DAS fb tembotrione 34.4 % SC @ 125 g a.i. ha-1 (POE) at 30 DAS and it was at par with atrazine 50 % WP @ 500 g a.i. ha-1(PRE) at 0-3 DAS fb topramezone 33.6 % SC @ 75 g a.i. ha-1 (POE) at 30 DAS (2.87), hand weeding twice at 25 and 50 DAS (2.70) and lowest in weedy check (1.40).
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