Weed Dynamics and Yield as Influenced by Various Weed Control Methods and Fertility Levels in Soybean

The experiment was conducted during Kharif season of 2006 at Junagadh (Gujarat) to study the weed dynamics and yield as influenced by various weed control practices with different fertility levels in soybean [ Glycine max (L.) Merril]. Results indicates that at 20 DAS the treatment W 1 (Pre-emergence pendimethalin @ 0.5 kg ha -1 + HW and IC at 30 DAS) recorded lowest number of monocots, dicots and sedges weeds next to W 5 (Weed free upto 60 DAS through hand weeding). Similarly at 40 and 60 DAS the treatment W 3 (Post-emergence imazethapyr @ 75 g ha -1 at 25 DAS + HW and IC at 45 DAS) also reported minimum number of weeds next to W 5 . The lowest dry weight of weeds was recorded under treatment W 5 followed by W 4 and W 3 . Application of 40:80:40 kg NPK ha -1 recorded significantly higher values of weed count and total dry weight of weeds and grain yield compared to other levels. The treatment W 4 (2 HW + 2 IC at 20 and 40 DAS) was found at par with treatment W 5 in respect of grain yield.