Nitrogen mineralisation from mature bio-waste compost in vineyard soils. I. Long-term laboratory incubation experiments.
The steadily increasing utilisation of bio-waste compost in German viticulture requires a more detailed investigation of nitrogen (N) mineralisation parameters for mature bio-waste compost applied to vineyard soils. N Mineralisation kinetics were described with two superposing exponential equations. Long-term aerobic laboratory incubation experiments of 12 soil-compost substrates revealed that 5 ± 2.8 % of its total N content could be released from a rapidly decomposable fraction (half-life period t50 = 41 d at 15 °C) and another 60 ± 2.9 % from a slower decomposable fraction (t50 = 490 d). The remaining proportion (35 %) is considered not to be released in the medium term. The obtained potentially mineralisable nitrogen of 65% of total compost N significantly differs from current fertiliser recommendations, which were adopted from calculations for agricultural conditions. For fertiliser recommendations in viticulture, we recommend the consideration of a higher N mineralisation potential for organic fertilisers.
Nendel, C.; Reuter, S.; Kubiak, R.; Nieder, R. 2004. Nitrogen mineralisation from mature bio-waste compost in vineyard soils. I. Long-term laboratory incubation experiments. Journal of Plant Nutrition and Soil Science, 167 (4), 397-407.