Distribution and performance of ardu (Ailanthus spp) in semi-arid regions of Rajasthan

A survey was conducted in 18 semi-arid districts of Rajasthan to study the distribution and growth performance of ardu (Ailanthus spp) tree. The mean values for age (11.02 years), height (9.36 m), collar diameter, CD (1.25 m), diameter at breast height, DBH (1.06 m), clear bole length, CBL (2.52 m), plant coverage area, PCA (6.42 m) and number of branches (5.95) were recorded on the basis 324 sample trees. The maximum numbers of plants were found in the age group of 5–10 years followed by 10–15 years and more than 20 years. The maximum population density (500–5000/km²) of ardu tree was found near the periphery of towns and cities. The maximum percent changes in the growth performance viz., height (26.85%), CD (44.44%), DBH (46.27%), CBL (12.09%), PCA (43.37%) and in number of branches (24.84%) were found in the age group of 5–10 years. After 10 years of the plant age, the percent improvements in all the growth parameters were decreased. The growth performance of the plants showed positive trend between and within age group of the plants over the different clusters of age groups. Multi-tier (Ardu + Dichro + Cenchrus) and two-tier (Ardu + Cenchrus) systems of agroforestry produced 33 and 30 q/ha dry leaves yield of ardu with a net income of Rs. 15000 and 14200, respectively.