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THE INFLUENCE OF N AND P FERTILIZATION ON SOME CHEMICAL CHARACTERISTICS OF THE SOIL
Abstract
The influence of fertilization with nitrogen (N) at doses of 40, 80, 120, 160 kg/ha and phosphorus (P) at doses of 40, 80, 120, 160 kg/ha was studied in a long-term experiment on a Haplic Phaeozems. The results obtained showed the following: the applied nitrogen doses did not significantly influence the humus content in the soil; simultaneous application of 80-160 kg/ha P and 40-160 kg/ha N generated distinctly and very significant increases in the hummus and total nitrogen content of the soil. Ammonium nitrate caused a decrease in soil pH which varied depending on the applied dose, from 5.75 for the unfertilized control to 5.37 at 160 kg N/ha. Fertilization with nitrogen and phosphorus resulted in significant yield increases as compared to the unfertilized control. The highest yields were obtained by applying maximum doses of fertilizers. Application of phosphorus fertilizers resulted in significant increases of the mobile phosphorus content of for all doses. Mobile phosphorus values increased from 60 mg/kg for P0 to 204 mg/kg for P160 kg/ha. Total phosphorus showed significant increases in application rates of 80, 120 and 160 kg P/ha. The heavy metal content (Cd, Cu, Mn, Ni, Pb, Zn) after 39 years of fertilization with nitrogen and phosphorus on a Haplic Phaeozems did not undergo statistically significant changes.
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