Abstract
This paper presents the experimental results obtained from a long-term experience after 29 years of fertilization with nitrogen and phosphorus. The applied nitrogen derived from ammonium nitrate and phosphorus from concentrated superphosphate (in dosages of 0, 40, 80, 120, 160 kg/ha). The application of phosphorus fertilizers led to very significant increases of mobile phosphorus content for all application dosages. Mobile phosphorus values increased from 60 mg/kg for P0 to 204 mg/kg for P160 kg/ha. Total phosphorus presented very significant increases for the application dosages of 80, 120 and 160 kg/ha (from 0.094% P for the unfertilized control to 0.146% P for the 160 kg P/ha dosage). Mobile potassium level decrease in soil as a result of nitrogen and phosphorus fertilization. The ammonium nitrate determined a decrease of the soil reaction and varied depending on the applied dosage, from 5.75 for the unfertilized control to 5.37 pH units.
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