Abstract

Allelopathic influence of six agroforestry tree species viz. Eucalyptus tereticon:... Leucaena leucocephala, Ailanthus excelsa, Gliricidia sepium. Acacia niloticu and Tectona grandis were tested. The leaf extract of six trees were used for germination test with Casuarina equiser and the effect was measured in terms of germination, root and shoot length, drymatter prod and vigour index. In an another experiment different concentrations of the above mentioned tree leaves were prepared by mixing them with pot mixture at the leaf: pot mixture ratio of 1:2, 1:1 and 2:1 and is utilised as a mediuin for C.equisetifolia seedling growth. The result of both experiments explained highest deleterious effect ofE.tereticornis and Lleucocephala on C.equisetifolia germination and nodulation. Moderate effect was found in A.excelsa and Acacia nilotica. However less depressed effect was exerted by G.sepium Among the different leaf concentrations, 1:2 and 1:1 were suitable for C.equisetifolia seedling growth.

Keywords: Allelopathy, Forestry Trees, Casuarina equisetifolia