Effect of weed management on weed flora, weed population, weed dry weight, weed control efficiency and weed index of grain amaranth (Amaranthus hypochondriacus L.) under south Gujarat condition

Abstract

A field experiment was conducted during rabi season of 2023-24 at the College Farm, Navinchandra Mafatlal College of Agriculture, Navsari Agricultural University, Navsari to study the “Weed management in grain amaranth (Amaranthus hypochondriacus L.) under south Gujarat condition.” The experiment was laid out in Randomized Block Design with three replications and ten treatments. Cyperus rotundus, Cynodon dactylon, Echinochloa crusgalli, Convolvulus arvensis, Trianthema portulacastrum and Euphorbia hirta were observed major weed flora in grain amaranth field. Weed free treatment was recorded significantly the lowest number of grassy, broad leaved and sedge weeds. Among the chamical practices, significantly lowest weed dry weight were found under Oxadiargyl @ 50 g a.i. ha-1 (PE) followed by hand weeding & Interculture at 30 DAS at 45 DAS and Oxadiargyl @ 50 g a.i. ha-1 (PE) followed by Quizalofop @ 50 g a.i. ha-1 at 30 DAS (PoE) at harvest. Oxadiargyl @ 50 g a.i. ha-1 (PE) followed by Quizalofop @ 50 g a.i. ha-1 at 30 DAS (PoE) were found the maximum weed control efficiency and minimum weed index.