Effect of weed management in nutrient uptake and yield of Bt cotton (Gossypium hirsutum L.) under TBP command area

Abstract

A field experiment was conducted during Kharif of 2018-19 at KVK farm raichur, Karnataka under TBP irrigation command area to study the effect of weed management in nutrient uptake and crop yield. The experiment consists of 11 treatments with three replications. Among all the weed management treatments, significantly higher uptake of nutrients by cotton was recorded in weed free check (155.51N kg ha-1, 45.29 P kg ha-1 and 155.41 K kg ha-1) at the same time lower uptake of nutrients by weeds (0 NPK kg ha-1) were also recorded in weed free check, but higher uptake of nutrients by weeds were found in weedy check (84.69 N kg ha-1,19.08 P kg ha-1 and 89.40 K kg ha-1). Weed free check was recorded higher number of bolls per plant (45 plant-1), higher boll weight (5.74 g) and higher seed cotton yield (2636 kg ha-1) followed by sequential application of herbicides.