Informatics Publishing Limited

M. A. Kabir , M. Kamaluddin , M. D. Miah

Abstract

The acclimation potential of Chickrassia velutina Wight et Arn. Stem cuttings to water stress was investigated in the nursery with respect to four watering regimes: watering daily, three-day, seven-day and fifteen day intervals. Multi-plant plots, containing eight stem cuttings per plot and one single plant per polythene tube were distributed among three randomised blocks. Leaf area, plant height and dry weights of ischolar_main, stem and total plant were measured. The species showed significant decrease in total plant biomass in water stressed conditions. One important acclimation mechanism was the allocation of assimilates to ischolar_main growth relative to shoot. The species also acclimated to soil water stress by decreasing leaf area thereby reducing transpiration.

Full Text

     

M. Shah Newaz , M. Kamaluddin

Abstract

Acacia auriculiformis is a very fast growing species belonging to the family Leguminosae that have been introduced in the plantations in Bangladesh for their faster growth and wide range of adaptability. The present study aimed at development of growth and yield prediction models for the species using simultaneous equation method. Models were selected for the species to estimate the stand height, stand dominant height, stand diameter, stand basal area per hectare and volume yield per hectare. Paired t-test, 45-degree line test, per cent absolute deviation and biological principle of stand development were used for the validation of chosen models. The results suggest that the models derived were statistically and biologically acceptable and could be satisfactorily used for stands of Acacia auriculiformis of ages 3-9 yeara and site indices of 13.47 to 19.20 m based on a base age of 6 years in the central region of Bangladesh.

Full Text

     

M. A. Ali , S. Akhter , M. Kamaluddin

Abstract

Seed germination, seedling mortality and subsequent growth of Albizia procera seedlings were studied. Seeds were treated with hot water of 50° and boiled water of lOO°C for three minutes and compared against the untreated seeds soaked in cold water. It was observed that the germination per cent was higher and mortality was lower in the case of untreated seeds. Root/shoot ratio oflength and biomass were not different among thOse seeds. The overall performance was found better in the case of untreated seeds though there was a little advantage in shoot length and ischolar_main length in the case of lOO°C treated seeds.

Full Text