A study of age and habitat differences in the fuel yield of Prosopis juliflora.
Plantations of P. juliflora on shifting sands in Rajasthan having reached a stage where they can be exploited for their fuel yield, a study was made to determine the optimum age for exploitation and also to investigate the potential fuel yield of trees on sites with different mean annual rainfall (268, 285, 287, 350, and 395 mm.). Sampling units (the single tree vs. the cluster of trees arising from a single root system) were also tested. Habitat differences were significant only for trees 4-10 years old, and tree-to-tree variability decreased with increasing age. In general, stands should not be exploited before 10 years. D.b.h. and tree height were both positively correlated with fuel yield, accounting respectively for 42.58 and 24.76% of variation. The equation Y = 2.10 + 5.08 X, when Y = yield in kg., and X = d.b.h. in cm., can be used for prediction purposes. KEYWORDS: Diameter relation \ fuel volume \ Fuelwood management \ Fuelwood yield \ Increment \ Prosopis juliflora \ Rotations fuelwood \ yield tables