Application of Various Doses of Nitrogen on the Performance of Okra in Rooftop Garden

The present study was carried out at the rooftop garden of Department of Agroforestry and Environmental Science, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from June to September 2019 to investigate the performance of okra with different doses of N in rooftop garden. Four levels of nitrogen (N) viz. N0 = Control (0 kg N ha-1), N1 = 120 kg N ha-1, N2 = 150 kg N ha-1 and N3 = 180 kg N ha-1. The experiment was laid out in a Completely Randomized Design (CRD) with three replications. Data on different growth, yield contributing parameters and yield were recorded and analyzed statistically. The recorded data on different growth yield and yield contributing parameters were significantly influenced by different nitrogen doses. Regarding growth parameters, the highest plant height (123.20 cm), leaf length (30.17 cm) and stem base diameter (3.25) were recorded from the treatment N3 (180 kg N ha-1) whereas control treatment showed lowest results. Again, the highest leaf breadth (37.49 cm), number of leaves plant-1 (62.07), number of branches plant-1 (9.87), number of nodes plant-1 (24.20), number of internodes plant-1 (23.87), fruit petiole length (5.76 cm), fruit length (13.20 cm) and fruit diameter (2.11 cm), number of fruits plant-1 (24.10), single fruit weight (16.59 g), yield plot-1 (3.80 kg) and  yield ha-1 (13.89 t) were found from the treatment N2 (150 kg N ha-1). The lowest single fruit weight (15.14 g), number of fruits plant-1 (16.30), yield plot-1 (2.53 kg) and yield ha-1 (9.21 t) were recorded from the control treatment N0 (0 kg N ha-1). From the above result, it can be said that the treatment N2 (150 kg N ha-1) considered as best compared to other studied treatments.