بررسی اثر کودهای مختلف بر رشد و جذب عناصر معدنی نهال ها در نهالستان های دو منطقه کلوده و شهرپشت

Two experiments were conducted to determine effects of N, P and manure fertilizers on growth of Fraxinus rotundifolia, Alnus subcordata, Acer velutinum and Quercus castaneifolia.The one year old seedlings were fertilized with ammonium sulfat, triple superphosphate and manure. Leveles of applied nitrogen fertilizer were 0, 40 and 80 Kg/ha.The leveles of phosphat were 80 and 120 Kg/ha. The leveles of manure were 0 and 30 ton/ha. Data were collected from height and diameter of 15 seedlings and root measurment was done for three samples as well. Statistical Design of Factorial in Complete randomised blocks (CRB) with three replicates were used in each nursery. In Shahrposht nursery height and diameter of the most species were not affected significantly by any of the fertilizers. Seedling growth of species in Kolodeh nursery was improved in fertilizer treated plots, especially with manure. Results clearly show difference between Kolodeh and Shahrposht nurseries in response to fertilizers. Key words: nursery, fertilization, growth, seedling, Fraxinus rotundifolia, Alnus subcordata, Acer velutinum , Quercus castaneifolia.