EFFECT OF DIFFERENT NITROGEN DOSES ON GROWTH AND YIELD OF COTTON (GOSSYPIUM HIRSUTUML)

Abstract

The trial was set up in a three replicated randomized complete block design and was carried out at the Student’s Experimental Farm, Department of Agronomy, Sindh Agriculture University Tandojam, during Kharif 2023. The trial included three different nitrogen doses: nitrogen at 120 kg ha -1 (20% < Recommended), nitrogen at 135 kg ha -1 (10% < Recommended), nitrogen at 150 kg ha -1 (Recommended), nitrogen at 165 kg ha -1 (10% > Recommended), and nitrogen at 180 kg ha -1 (20% > Recommended). The statistical analysis of the data showed that the growth and yield of cotton was significantly (P<0.05) impacted by the nitrogen doses in comparison to nitrogen at 150 kg ha -1 (Recommended). Nitrogen application at 180 kg ha -1 (20% > Recommended) resulted in the maximum plant height (143.36 cm), sympodial branches plant -1 (28.09), bolls plant -1 (43.36), seed cotton yield plant -1 (116.70g), seed cotton yield kg ha -1 (4463.2kg), and staple length (30.00mm), according to the experiment's findings. With 141.65 cm plant height, 42.89 bolls plant -1 , 27.70 sympodial branches plant -1 , 114.88g seed cotton yield plant -1 , 4426.7kg seed cotton yield kg ha -1 , and 29.58 mm staple length, nitrogen dose @ 165 kg ha -1 (10% > Recommended) achieved the second- place ranking. Nitrogen @ 120 kg ha -1 (20% < Recommended) showed the lowest performance, with 121.82 cm plant height, 28.24 bolls plant -1 , 14.92 sympodial branches plant -1 , 83.08g seed cotton yield plant -1 , 3384.6kg seed cotton yield kg ha -1 , and 26.26mm staple length. The experiment's findings revealed that a dose of nitrogen @ 165 kg ha -1 (10% > Recommended) was found to be suitable for achieving the highest cotton yield due to the lack of statistically significant differences with Nitrogen @ 180 kg ha -1 (20% > Recommended).