WOOD AND PLYWOOD QUALITY CHARACTERIZATION OF NEW AND ALTERNATE SPECIES AMENABLE FOR COMPOSITE WOOD PRODUCTION

India is one of the robust consumers of engineered wood products and the raw material demand for engineered wood production is increasing at an alarming rate. Currently the plywood industries in the country depends only on few species and demands screening of alternate and species amenable for plywood production. Therefore studies were conducted to characterize the physical and mechanical properties of eight different tree species viz., Toona ciliata, Chukrasia tabularis, Acacia hybrid, Neolamarckia cadamba, Acrocarpus fraxinifolius, Swietenia macrophylla, Casuarina equisetifolia and Mitragyna parvifolia which are potential tree components in Agroforestry system. The physical properties like density exhibited wider variation between the species. In general, all species exhibited medium to high density values. The studies on veneer recovery indicated that barring Mitragyna parvifolia, all other species exhibited more than 50% veneer recovery and extend greater scope of adoption. Similarly the veneer quality exhibited wide differences and several species registered face veneer quality. The analysis of mechanical properties of plywood made out of all eight species indicated that the Modulus of Elasticity (MOE) was well within the acceptable range and the Modulus of Rupture (MOR) was on higher side which indicated that these species could play a vital role in manufacture of medium to high density plywood

Influence of <i>Eucalyptus</i> Agroforestry on Crop Yields, Soil Properties, and System Economics in Southern Regions of India

Agroforestry benefits farmers, making it a sustainable alternative to monoculture. To create a viable Eucalyptus clone-based agroforestry system, a field experiment was carried out in Tamil Nadu, India. The economics and changes in the soil qualities were evaluated by growing agricultural and horticultural crops, namely pearl millet, sorghum, maize, sesame, small onions, green gram, and red gram, as intercrops under eight-month-old eucalyptus clone trees using a randomised block design in three replications at a spacing of 3 m × 1.5 m. The plots for the intercrops and the eucalyptus clones were kept apart for comparison. Maize showed the greatest drop in plant height during all the phases, including 30 DAS, 60 DAS, and harvest, while small onions showed the least reduction in plant height. Sesame and small onions showed the greatest drop in dry matter production, whereas sorghum showed the least. In terms of the intercrop yield reduction, maize had the biggest reduction and green gram had the lowest. Red gram had the largest crop equivalent yield, whereas maize had the lowest. The volume of the trees was generally increased more favourably by red gram than by green gram. The intercrops had some effects on the nutrients in the soil. Red gram intercropping had the highest levels of EC, soil organic carbon, available soil nitrogen, available soil phosphorus, and available soil potassium, while the sole tree treatment had the lowest levels. Small onions, red gram, and sesame were the crops; tree + small onion, tree + red gram, and tree + sesame were the intercrop combinations with the highest gross income, net income, and B:C in the intercropping treatment alone. Tree + green gram had the highest land equivalent ratio (LER) and the red gram, sesame, and small onion intercrops were shown to be the most profitable. Although the present study supports a complementary relationship, the lack of awareness among farmers of Eucalyptus allelopathy formed the major limitation