Periodic growth of some tree seedlings during summer in urban areas

The growth of Albizia lebbeck benth., Peltophorum pterocarpum Baker and Ficus religiosa L. were slow during the initial period of May and early June, but during the later half the growth rate increased. All species showed less growth in the city areas of Gulshan-e-Iqbal, Nazimabad and Liaquatabad as compared to the University campus, which is a clean area. Among the species studied, P. pterocarpum was more tolerant of automobile pollution and existing climatic conditions.