The research was carried out plantation Didactic Station Timisoara, during the three years, respectively 2008, 2009 and 2010. Fertilizers applied were both nitrogen fertilizers, phosphorus and potassium in different doses and organic fertilizers, manure respectively. Manure was applied in quantities of 30 t/ha in autumn 2007. The results showed different contents of nitrogen, phosphorus and potassium, depending on the vegetation of trees, respectively in April, the content is higher in comparison with September, this is due to consumption of tree nutrients during the growing consumption of otherwise normal, because in this period, the trees need fertilizer application in order to take advantage. Determination of Total Nitrogen - Kjeldahl method was (mineralization of soil is made by boiling with concentrated sulfuric acid in the presence of catalyst). Mobile Phosphorus - was determined by the Egner-Domingo-Rhiem a spectrophotometer UV - VIS. Potassium assimilated - was extracted in ammonium acetate and lactate was determined with atomic absorption spectrophotometer. In this direction have been made both their research and by other researchers in the field, but concrete results in this sense can be seen only after a greater number of years because the amount of nitrogen, phosphorus and potassium in soil amended continuously due to consumption by the trees. In Romania, research in this field as complex, are limited, the main cause is the relatively high cost of fertilizers, and lack of financial resources to continue research and present the results obtained. The work is original, both in terms of information it provides those interested in fertility status of soils occupied by trees, and because it offers both practical solutions in soil conditions and the orchards. Following these investigations, it may occur through the application of mineral and organic fertilizers in appropriate doses, without involving large expenditure, to pollute the soil or fertilize with amounts too low which would reduce production and to obtain low-quality fruit, which would remain sufficiently so high crop loss and financial resources. The book has great practical importance, because without new and needed both of fertility status of land occupied by trees and in the achievement of steady production and good quality.

soil, fertilizers, total nitrogen, phosphorus dynamics, potassium assimilated

Presentation: oral