M. MONIRUZZAMAN
Senior Scientific Officer (Horticulture)
Agricultural Research Station, Raikhali, Chandraghona, Rangamati Hill District-4531.
M. S. ISLAM
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
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University
Crop-Soil-Water Management
Coriander, Fertilizer
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. The soil of the experimental field was originally Shallow Red Brown Terrace of Madhupur clay under Salna Series. The field belongs to silt loam soil, which was medium in organic matter and moderately acidic. Texturally the soil was silt-loam, with 6.1 pH, 1.54% organic matter, 0.078% total N, 17 mg/kg available P and 0.27 me% exchangeable K. 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 S1, 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 S1, 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 (S0) 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. Urea and MoP were applied in five equal installments at 35, 65, 95, 125, and 155 days after sowing of seeds. Irrigation and other cultural practices were made as and when necessary. Irrigation was given to the plants after each top dressing of urea and MoP by water can. Flower pruning was done whenever seen in the crop field. Harvesting was done from the 4th week of February to the 4th week to May at an interval of 15 days when the leaves became most succulent, soft, and more green. Harvesting was made by uprooting the longer plants from each plot.
ISSN 0258-7122, Bangladesh J. Agril. Res. 34(2) : 205-213, June 2009
Journal