Dependence of soil fertility on organic and mineral fertilization in a 46-year long-term field experiment
2010
Hoffmann, S. | Berecz, K. | Simon, S.
Increasing doses of farmyard manure (FYM) or equivalent mineral NPK fertilizers and their combinations were analysed in a crop rotation with potato, maize and winter wheat with special regard to their long-term influence on soil fertility. The yield-increasing capacity of FYM doses was only 82%, as compared to the equivalent amount of mineral NPK. Fairly high N release (50.9 kg ha <sup>−1</sup>) could be observed on the unfertilized plots. Great differences in N utilization were recorded, depending on the form and dose of fertilizers. The average N utilization from FYM was only 29.3%, while that of the equivalent fertilizer application was 49.8%. The lowest soil reactions were observed without fertilization and at the highest NPK doses. Negative N balances generally resulted in low soil organic matter content. FYM and equivalent NPK fertilizers had a similar influence on the ammonium lactate (AL)-extractable K <sub>2</sub> O content of the soil, while an increase in the AL-P <sub>2</sub> O <sub>5</sub> content could be observed in the case of mineral fertilization.
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