Impact of harvest-aid defoliants on yield and economics of high density cotton
2019
Mrunalini, Kancheti | Rekha, M Sree | Murthy, V.RK | Jayalalitha, K.
A field experiment was conducted to study the effect of chemical defoliation on growth parameters, seed cotton yield and economics of cotton under high density planting during kharif, 2016. Defoliation with Etherel @ 2000 ppm at 60 boll opening percentage resulted in higher number of picked bolls plant⁻¹ and boll opening percentage and seed cotton yield (2359 kg ha⁻¹). At harvest, significantly highest drymatter accumulation was recorded with Urea @ 15% (T₆) (22692 kg ha⁻¹). Dropp Ultra 560 SC (Thidiazuron 360 + Diuron 180) @ 200 ml/ha recorded significantly higher leaf defoliation (99.7%) and was superior over other defoliants tried. Application of defoliants i.e., Dropp Ultra and Etherel at 60 BOP resulted in reduction of crop duration by 20 days.
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