Allelopathic Effects of Walnut Leaf Extracts on Plant Growth and Nodulation of Pea

Aqueous leaf leachate of walnut was evaluated for allelopathic effects on plant growth and nodulation of vegetable pea under poly house condition at KVK, Pithoragarh. Walnut leaf extracts with 20, 40, 60, 80 and 100% concentrations along with control were used in pot from seed germination to eve of the pod setting in vegetable pea. Plant growth parameters viz; plant height, root length, fresh and dry weight as well as collar diameter were significantly reduced as the concentration of leachates increased. Number of secondary roots, nodules per plant and size of nodule were also statistically decreased.