Growth performance of yemane (Gmelina arborea Roxb.) and mahogany (Swietenia macrophylla King.) in three geographical locations in the Philippines
2000
Buante, C.R.
Results have shown that yemane and mahogany trees in Mindanao region are bigger and taller compared to those trees in Visayas and Luzon areas [Philippines]. Classification of sites of yemane and mahogany was done using equations derived from the discriminant analysis. This can be classified into Site Class 1, Site Class 2, Site Class 3, Site Class 4, and Site Class 5. Site variables like age of plantation, planting density, slope, potassium content in the soil at A - horizon and wind speed significantly affected stump diameter of yemane. This means stump diameter growth increase with an increasing age of plantation. On the other hand, with closed spacing among trees, there is slow growth in stump diameter. Likewise, stump diameter becomes smaller as the slope increases and as the wind speed becomes strong. Total height of yemane trees responded positively with increasing age, higher soil pH at A-horizon and increasing slope but negative to higher elevation, sufficient potassium content in the soil at A-horizon, alkaline soil and higher phosphorus content particularly of B-horizon, higher rainfall and temperature. In the regression analysis, the stump diameter growth among mahogany trees had positively responded with age of plantation, slope and relative humidity but negatively affected by increasing planting density, elevation and wind speed. Likewise, total height of mahogany trees responded positively with increasing age, slope and soil pH at A-horizon and negatively affected with increasing elevation, soil depth, aspect, soil pH at B-horizon, temperature and wind
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