Department oj Fruit Culture and Orchard Management, Dr. Y. S. Parmar University of Horticulture and Forestry, Solan 173230 (HP).
* Present address: Temperate Fruit Research Station, Kotkhai 171 202 (H.P.)
The seedling height, leaf area and dty weight of leaf shoot and root increased upto 280 ppm of substrate N. The differences of growth parameters at 210 and 280 ppm N levels were non-significant. In general, a decline in growth parameters was observed when seedlings were supplied with N in excess of 280 ppm. Leaf N concentration between 2.73 and 3.14 per cent is optimum for growth. The fertilizer application in pecan should be so regulated that folhr N status remain between 2.73 and 3.14 per cent. The nitrogenous fertilizer application leading to leaf N status in excess or below this range will prove deleterious to pecan trees.
