2025, Vol. 8, Special Issue 1

author(s)
Anand SR, Somashekarappa PR, Atheekur Rehman HM and Mool Chand Singh

abstract
The field experiment was conducted at M block, field unit of AICRN on Potential Crops, University of Agricultural Sciences, Bengaluru to find out suitable post emergent herbicides for grain amaranth The experiment was laid out in a randomized complete block design (RCBD) with eight six post emergence herbicides along with hand weeding, weed free and weedy check treatments which were replicated thrice. The data indicated that at 30 and 45 DAS, early post emergent application of Quizalofop ethyl 5% EC @ 50 g a.i ha^-1 and Propaquizafop 10% EC @ 12 g a.i ha^-1 had significantly minimized weed density of sedges and grasses (1.60 and 1.82 m^-2 and 1.22 and 2.81 m^-2 at 30 and 45 DAS, respectively) and were on par with each other. However, lower weed density of broad leaved weeds (2.23 m^-2) were recorded with application of Clomazone 20% EC @ 750 g a.i ha^-1. Similarly, early post emergent application of Quizalofop ethyl 5% EC @ 50 g a.i ha^-1 was recorded lower weed dry weight of sedges and grasses (1.87, 2.51 and 1.81, 4.09 g m^-2, at 30 and 45 DAS, respectively) which was on par with Propaquizafop 10% EC @ 12 g a.i ha^-1. Significantly higher weed control efficiency was witnessed with Quizalofop ethyl 5% EC @ 50 g a.i ha^-1 (72.85% and 76.55% at 30 and 45 DAS, respectively) and found on par with Propaquizafop 10% EC @ 12 g a.i ha^-1 (68.70% and 74.07% at 30 and 45 DAS respectively) as compare to other treatments. Comparatively lower weed index (7.97%) was reported with Quizalofop ethyl 5% EC @ 50 g a.i ha^-1 which was on par with Propaquizafop 10% EC @ 12 g a.i ha^-1 with 10.52%. Significantly higher grain yield was recorded with weed free check (2162 kg ha^-1) which was on par with herbicide treatments of early post emergent application of Quizalofop ethyl 5% EC @ 50 g a.i ha^-1 and Propaquizafop 10% EC @ 12 g a.i ha^-1 (1896 and 1805 kg ha^-1, respectively) and weedy check recorded significantly lower grain yield (1005 kg ha^-1) compared to all other treatments. However, higher gross returns, net returns and B:C were realized with early post emergent application of Quizalofop ethyl 5% EC @ 50 g a.i ha^-1 (Rs. 94800 ha^-1, Rs.68179 ha^-1 and 2.56, respectively) followed by Propaquizafop 10% EC @ 12 g a.i ha^-1 (Rs. 90250 ha^-1, Rs.63525 ha^-1 and 2.38, respectively) and lower gross returns (Rs. 50250 ha^-1, Rs.25731 ha^-1 and 1.05, respectively) were obtained in weedy check as compared to all other treatments.