Effect of irrigation with municipal effluent on soil and growth of Pinus eldarica Medw. trees

In this study growth of 15 year-old trees of Pinus eldarica Medw. were investigated in two areas irrigated by municipal effluent and good water in south Tehran. For this purpose four sample plots (30×30 m) were systematic-randomly chosen in both areas. The results showed that diameter at breast height (d.b.h.), total height, crown length, average crown diameter, basal area and volume of Pinus eldarica Medw. trees and the concentration of nutrient elements (N, P, K, Ca, Mg) of soil in area irrigated by municipal effluent were significantly (P <0.01) greater than by good water. It might be concluded that the municipal effluent could be utilized for irrigation trees at afforestation.