Abstract
Experiments were conducted employing six different types of sieve sizes of wire-mesh (5.8 mm2 or 3 square hole cm-2, 4 mm2 or 6 square hole cm-2, 3.3 mm2 or 9 square hole cm-2, 3 mm2 or 11 square hole cm-2, 2.5 mm2 or 16 square hole cm-2 and 2 mm2 or 24 square hole cm-2) for preparation of growing media to grow planting stock of four tropical broadleaved forestry species Acacia catechu, Azadirachta indica, Phyllanthus emblica and Pongamia pinnata in root trainers. Morphological (height and root collar diameter), biomass (shoot biomass, root biomass and total biomass) and seedling quality parameters (sturdiness quotient, root-shoot ratio, volume index and Dickson quality index) of the raised seedlings were recorded after four months of growth. Significant positive correlation of increase in sieve size of wire –mesh and combined biomass (r= 0.876, p <0.05) and volume production (r= 0. 966, p <0.01) in all the species was recorded. The sieve size of wire-mesh having 5.8 mm2 or 3 square hole cm-2 appeared to be the best for preparation of uniform growing media with appropriate physical structure to raise planting stock of Acacia catechu, Azadirachta indica, Phyllanthus emblica and Pongamia pinnata in root trainers.
Keywords
Saturation, Collar diameter, Volume index, Dickson quality index, Compaction