Author(s):

Arunkumar, Negalur RB, Halepyati AS, Yadahalli GS and Nagaraj MN

Abstract: A field experiment was conducted during kharif, 2017 at the Main Agricultural Research Station, agriculture college farm, Raichur to study the “influence of sequential application of pre and post-emergence herbicides in maize (Zea mays L.).”. The experiment was laid out in Randomized Complete Block Design with three replications and twelve treatments. The experimental site was infested with broad leaved weeds, grasses and sedges. Amongst broad leaved weeds, Euphorbia geniculata was the dominant while in grasses, Brachiaria eruciformis was most prevalent and only one sedge Cyprus rotundus occurred. Based on the results, it was concluded that sequential application of herbicide treatments like, 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 (T₈) recorded significantly higher plant height, leaf area, leaf area index (LAI), dry matter production at all stages of crop growth, grain yield, stover yield, harvest index and lower weed index (7933 kg ha^-1, 9433 kg ha^-1, 45.68 % and 5.33 % respectively) and it was followed by 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 (7637 kg ha^-1, 9117 kg ha-1,45.58 % and 8.86 %, respectively) 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 (7027 kg ha^-1, 8527 kg ha^-1, 45.17 % and 16.15 %, respectively) and these treatments were found on par with each other. Whereas, hand weeding twice at 25 and 50 DAS (8380 kg ha^-1, 9867 kg ha^-1, 45.92 % and 0.00, respectively) was superior over other treatments.

Pages: 1364-1367  |  810 Views  343 Downloads

Download (488KB)