The paper critically discusses the methods so far developed for determining the best rotations (years from planting to final cutting) for forest plantations in order to help professional forestry personnel to determine the appropriate growing periods for Bangladeshi forest stands. It is observed that most rotation models which are in use place a lot of emphasis on the needs of wood producers. The needs of the industries and other users generally receive less attention, Recent developments abroad have attempted to rectify this situation. It should be borne in mind, however, that no single method can be considered to meet all our needs even for public investment purposes. We are suggesting means to select the models consistent with maximum economic growth resulting from income and employment effects on the nation as a whole. The analysis also presents techniques to decide the time of the final cutting decision at the end of the predicted rotation in view of specific changes in the economic climate and other conditions.

Rhizome assemblies and clump form and growth of nine arboretum grown bamboo species have been studied. Rhizome stalk has been found to play an important role in determining the form, shape and growth of clumps. This is due to not only the characteristic length of the stalk in some species but also its role in orienting the rhizome in relation to the centre of the clump and the mother culm in general and the line of gravity in particular. In areas where bamboos are worked heavily it is the rhizome stalk that is first affected and may result in congested clumps in species otherwise monopodial or loosely tufted. Rhizomes are commonly attacked by pathogenic soil ganisms, Parts like rhizome stalks, whole bud of the rhizome may be partly or wholly consumed or otherwise become inoperative and although these parts contribute to the development of rhizome assembly they do not contribute towards the growth of clump. This reduces the rate of growth of clumps considerably. Irrespective of species, only 8 percent of the buds develop into normal culms, 77 percent remaining dormant and 15 percent are damaged by pathogenic soil mlcrooganisms. It has been concluded tha- application of antipathogens individually or in combination with fertilizer will ameliorate the conditions of growth and considerably increase the outturn.

Please visit direct the article as shared PDF