From ecological point of view, the fertilization using manure, animal urine, compost, manure juice is the most important for fruit trees growing. Fruit species store nutrients in the form of organic compounds on biological processes using them next year, and in case of failure in the same year for fruit producing achieving and perpetuating the species. Using differentiated fertilization on two varieties of apple: Golden Delicious and Starkrimson, we tried to determine the production depending on it. The soil on which we used the differential fertilization was typical preluvosol soil type and the experience is Farm 10, the farm is established in Reghin and the following fertilization treatments were applied: first possibility is considered as the control where no fertilization was made, the other treatments: manure 20 tons / ha annually, manure 20 t / ha annually + N60 P60 K60 kg as / ha, N100 P80 K100 kg as / ha, N120 P100 K120 kg as / ha, N60 P60 K60 + leaf fertilizer, N100 P80 K100 + leaf fertilizer, N120 P100 K120 + leaf fertilizer, N100 P80 K100 +40 t/ha manure to the three years. In order to maintain and raise the productive capacity of soils and to obtain economically efficient production of chemical fertilizers is recommended fertilization. The efficacy of organic fertilizer depends on the nitrogen index, clay content and soil pH. The use of manure has a positive influence on fruit production in apple orchards improving nutrition conditions for all species of trees. The largest apple production both Starkrimson and Golden Delicious variety were obtained from the following: N100 P80 K100 + 40t/ha manure in three years and N120 P100 K120 + leaf fertilizer. The effect of fertilizers application is due, in general, to adequate quantity and assortments that fertilization provides the necessary nutrients and not least, the interactions determined in soil-plant system through nutrient bioavailability. High doses of mineral fertilizers causes significant increases crop, but lower than that moderate doses organic - mineral (complete) and even if we apply manure + superphosphate.

apple; Golden delicious; Starkrimson; typical preluvosol soil; fertilization

Presentation: oral