M. A. Mannan
Quarintyne Officer
DAE
M. A. K. Miah
Professor
Dept. of Genetics & Plant Breeding, BSMRAU.
M. M. U. Miah
Assistant Professor
Dept. of Agroforestry
M. A .S. Mondol
Assistant Professor
Dept. of Agricultural Extension, HSTU, Dinajpur.
Diversity, Mango accessions, Morphological parameters
Bandarban Sadar of Hill tract, Gazipur Sadar of plain land and Niamotpur, Naogaon of Barind tract.
Variety and Species
The study was carried out for a period of three months from April '99 to June '99 (During summer). Data for diversity of mango of the homestead were collected using questionnaire. The location of the study sites were Bandarban Sadar of Hill tract, Gazipur Sadar of plain land and Niamotpur, Naogaon of Barind tract representing high medium and low rainfall area, respectively. The research work was carried out in ten selected villages in each location. Five households were randomly selected from each selected village for survey. Ultimately a total of 150 households were selected for data collection.
Farmers' participatory selection procedure was adapted to selected superior mango cultivation from the accessions evaluated for genetic diversity. In order to select superior 5 types, farmers' preferences on our most important traits (ranks 1-4, 1 bearing the highest) were utilized. Based on farmers' response, total score for each trait was then calculated as Paudyal (1991) using the formula: Total score = FiWi ;
Where Fi is the number of times a character appeared in the rank and Wi is the weight given to rank (4= first, 3= second, 1= fourth).
The four highest score traits based on farmers response were pulp taste, fruit yield, pulp and fruit size (Fruit weight). Four traits preferred by the farmers and one important trait (TSS) by the researchers was used for then selection of superior accessions.
Data on six qualitative and 17 quantitative traits were recorded. The qualitative traits were fruit shape, fruit color, pulp color, taste, stone shape and presence or absence of fiber with the stone. The traits of qualitative in nature were leaf length, leaf width, leaf area, inflorescence length, fruit width, fruit thickness, fruit volume, fruit yield, pulp%, total soluble solid (TTS)%, stone length, stone width, stone thickness, stone width, and pH. Data were collected from the standing plant at the homestead where it was grown. Inflorescence length and canopy diameter was measured under field condition. Fruit yield was recorded on the basis of grower's information. Yield in relation to canopy area was used at a measure of efficiency (Kg/m2) Ten leaves and five mature fruits were collected from each plant and were taken immediately to the Laboratory of the Department of Genetics and Plant Breeding of BSMRAU. Rest of the qualitative and quantitative data were recorded as soon as possible. TSS was determined with hand Refrectometer and PH was determined by pH meter. Qualitative data for each character were averaged accession wise. Fruit and pulp color was determined by comparing the color with color charts. Microsoft Excel programs were used to process all collected information. SPSS Software was used to estimate the descriptive statistics of the data; uni variate analysis was performed using MSTAT -C software.
J. Sci. Tech. 3: 45-50 (2005)
Journal