EFFECT OF INTEGRATED WEED MANAGEMENT ON GROWTH INDICES AND STOVER YIELD OF SOYBEAN
LAHRI MAL, SURESH KUMAR*, A.K. SHARMA AND SATYENDER SINGH
JNKVV College of Agriculture, Indore
*RDS Seed Farm, CCSHAU, Hisar
(Received: 24 August 2013; Accepted: 26 September 2013)
A field experiment was conducted at JNKVV, Zonal Research Station, at College of Agriculture, Indore (M.P.) during the kharif season on a well drained deep clay soil, low in available N, medium in phosphorus and high in available potassium with normal pH (7.6). The experiment was laid out in Randomised Block Design replicated thrice with the treatments consisting of different levels of clomazone, trifluralin, Imazethpyr+pendimethalin, imazaquin alonwith their combination with interculture, which were compared with weedy check, farmers’ practice and weed free upto 60 days. At 75 DAS, the highest dry matter per plant was recorded under weed free plots followed by trifluralin + IC, while the lowest dry matter/plant was recorded from unweeded control plot. At harvest, the highest dry matter per plant was recorded under weed free plot but it was at par from trifluralin + IC and other integrated weed management methods. The highest stover yield (4053 kg/ha) was obtained under weed free condition which was at par with treatment trifluralin + IC (IWM). The lowest stover yield (1941 kg/ha) was recorded under weedy check. The NAR was highest under farmers practices at 30-45 DAS interval, while at 45-60 DAS it was maximum in imazaquin 120 g + IC treatments followed by imazaquin 120 g/ha and in both intervals it the lowest in weedy check. CGR was the highest under weed free plots followed by (0.253) in trifluralin + IC treated plots at 15-30 and 30-45 DAS interval. But at 45-60 DAS, the higher CGR was recorded (0.550) under imazethapyr + IC treated plots followed (0.542) in farmers practice. At 60-75 DAS interval, the highest CGR was recorded (1.088) under weed free plot followed (1.044) by clomazone 750 g + IC. RGR was highest under farmers’ practices at 30-45 DAS and 45-60 DAS and weedy control at 60-75 DAS interval.
Key words: Soybean, integrated weed management, dry matter, stover yield, growth indices