Evaluation of optimum timing of nitrogen fertilizer application in cotton crop under the climate change scenario
A field experiment was conducted to study the evaluation of optimum timing of nitrogen fertilizer application in cotton crop under the climate change scenario of Rahim Yar Khan Zone. The experiment was conducted at Adaptive Research Farm Rahim Yar Khan during the year 2022-23. The experiment was laid out in RCBD design with three replications. The different timings of Nitrogen fertilizer i.e ½ nitrogen @99.5kg/ha on 30 days after sowing and ½ nitrogen @99.5kg/ha on 60 days after sowing significantly affected the plant population/m2, plant height (cm), number of mature bolls/plant, seed cotton boll weight (g), and seed cotton yield kg/ha. The different timings of Nitrogen fertilizer was significantly affected almost all the characters related to growth and yield of B.T cotton variety NIAB-878. The average of two years result revealed that significant maximum germination count or plant population/m2 i.e 9.3, plant height (cm) i.e 105.4, number of bolls/plant i.e 15.2, boll weight (g) i.e 2.7 and maximum seed cotton yield i.e 653.6 kg/ha was obtained where ½ nitrogen @99.5kg/ha was applied on 30 days after sowing and ½ nitrogen @99.5kg/ha was applied on 60 days after sowing.
Keywords: Cotton. Nitrogen, optimum timings, and fertilizer.
