APPLICATION OF VARIOUS DOSES OF NITROGEN ON THE PERFORMANCE OF OKRA IN ROOFTOP GARDEN

Abstract

ABSTRACT The present study was carried out at the roof of second floor of Academic Building, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from June to September 2019 to investigate the performance of okra with different doses of nitrogen (N) in rooftop garden. Four levels of N viz. N = Control (No N), N 1 = 120 kg N ha -1 , N 2 = 150 kg N ha -1 and N 3 = 180 kg N ha . 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 N 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 N whereas control treatment gave the lowest values. 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 (24.10), single fruit weight (16.59 g), yield plot -1 (3.80 kg) and yield ha -1 (13.89 t) were found in N 2 treatment. The lowest single fruit weight (15.14 g), number of fruits plant

(16.30), yield plot -1 (2.53 kg) and yield ha -1 (9.21 t) were recorded in control treatment. Regarding quality parameters of soil moisture and light, the highest soil moisture (22.13%) and soil temperature (16.20°C) were found from the treatment N

but the highest light intensity (32.54 klux) was found from N whereas the lowest soil moisture (20.55%), soil temperature (15.82°C) and light intensity (30.46 klux) were recorded from the control treatment. From the above result, it can be concluded that application of 150 kg N ha -1 2 may ensure higher yield of okra in rooftop garden. 3 -1 -1 0 -1 3