Author(s): M. JAIDKA AND J. S. DEOL

Abstract: The present investigation was conducted to evaluate the growth rate, and path analysis for sixteen characters of soybean cv. SL 744 during 2014 and 2015. The experiment was laid out in randomized complete block design having 8 treatments including control, detopping and foliar spray of mepiquat chloride (MC) in three doses and at two different intervals which were replicated four times. During 2014, two sprays of MC @ 200 and 250 ppm registered 46.0 and 37.7 per cent higher NAR as compared to control (0.50 mg cm-2 day_-1 respectively. Furthermore, in 2015, maximum NAR was reported by two sprays of MC @ 250 ppm and found statistically at par with detopping, but significantly higher (36.7%) than control (0.49 mg cm-2 day^-1). Seed yield showed a positive and significant correlation with accumulation of dry matter (80, 110 DAS and at harvest), specific leaf weight (80 and 110 DAS) and pods per plant in both 2014 and 2015. In 2014, pod setting percentage followed by number of flowers plant^-1, LAI (110 DAS) and accumulation of dry matter at harvest showed highest positive direct relation with seed yield. But in 2015, highest positive direct effect on seed yield was exhibited by flowers plant^-1 followed by accumulation of dry matter at harvest, accumulation of dry matter at 110 DAS and specific leaf weight at 110 DAS. Results of the investigation clearly demonstrated that to enhance the growth rate of soybean, farmers can either go for detopping at 50-55 DAS or sequential application of MC @ 200 or 250 ppm at two growth stages.

DOI: 10.22271/09746315.2024.v20.i1.1758

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