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Organic Matter Production and Distribution of Nutrients in Plantations of Acacia mearnsii in Nilgiris, Tamil Nadu
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Componentwise biomass production and the distribution of nutrients at the age of 4, 7 and 10 years of Acacia mearnsii plantation is presented. Linear regression analysis was carried out. Among the prediction variables tried, D2H was found to be the most reliable parameter for prediction purposes. The total above-ground biomass produced at 4, 7 and 10 years of age by class A was 20.4 t/ha, 27.1 t/ha and 151.4 t/ha; and 64 t/ha, 45.6 t/ha and 21.9 t/ha by class B respectively. Harvesting of utilizable biomass (wood. bark and branches) would result in the removal of 385 kg/ha (N), 4 kg/ha (P), 300 kg/ha (K), 205 kg/ha (Ca) and 50 kg/ha (Mg). Leaving leafand twig components at the site would not compensate the drain off. Some safeguard in terms of fertilization etc. is suggested, while raising the plantations of Acacia mearnsii.
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