M. MON1RUZZAMAN
Senior Scientific Officer (Horticulture)
Agricultural Research Station, Raikhali , Chandraghona, Rangamati Hill District-4531
M . S. TSLAM
Ex-Associate Professor
Deptt. of Horticulture, BSMRAU, Gazipur,
M. M . HOSSAIN'
Professor
Deptt.of Horticulture, BSMRAU, Gazipur,
T. HOSSAIN
Professor
Deptt of Crop Botany, BSMRAU, Gazipur,
M . G. MIAH
Professor
Deptt. of Agro forestry and Environment, BSMRAU, Gazipur, Bangladesh.
Bangladhonia, Shade, Nitrogen, Yield, Quality.
Research Farm of the Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU)
Crop-Soil-Water Management
The study was conducted at the Research Farm of the Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU) during the period from December 2002 to May 2003. Since there is no released variety of Bangladhonia, the cultivar used by the hilly farmers was used in the present study. The experiment was laid out in a split-plot design with three replications having four shade levels (0, 25, 50, and 75% shade) in main plot and five nitrogen levels (0, 115, 138, 161, and 184 kg N/ha) in subplots. In So treatment, sunlight was allowed to fall over the Bangladhonia plants without any barrier which was considered as 0% shade. In S 1 , S2, and S3 treatments, by using nylon nets, the light level in the form of PAR were reduced to 75%, 50%, and 25% PAR, which were designated as 25%, 50%, and 75% shades. Nylon nets having different pore sizes and colours tested previously were used in the present field experiments. A single layer of nylon blue net was used to create approximately 50% shade, whereas two layers of the same for 75% shade and single layer of white net was used for 25% shade. After laying out the experimental plots, nylon nets were hanged upto 1.5 meter in height from the soil level over the S 1, S2 , and S3 plots for maintaining 25%, 50%, and 75% shade, respectively, with the help of bamboo sticks. No net was used in the control (So) plots. Seeds of Bangladhonia were broadcast @ 40 kg/ha on 14 December 2002. After sowing of seeds, the plot was covered with rice straw . Seed germination took place at 22 days after sowing. Manure and fertilizers were applied@ cowdung 14 t, 75 kg P205, 120 kg K20 per hectare and nitrogen as per treatments. Nitrogen, P, and K were applied in the form of urea, TSP, and MoP. The full amount of cowdung and TSP were applied during land preparation. Data on plant height, number of leaves per plant, length of leaf, fresh weight per plant, leaf area of the biggest leaf were recorded. These parameters were taken from 10 plants from each plot at 15-day intervals. Moreover, plant height, no. of leaves/plant, length of leaves, individual leaf area, fresh weight/plant, and fresh weight/leaf were calculated from the average of 6 harvests and considered as yield contributing characters. Leaf area was measured by using green leaf area meter (model GA-5).
Bangladesh J. Agril. Res. 34(2): 205-213, June 2009
Journal