TY - JOUR AU - Brod, Eva AU - Haraldsen, Trond Knapp AU - Breland, Tor Arvid PY - 2012/12/18 Y2 - 2024/03/28 TI - Fertilization effects of organic waste resources and bottom wood ash: results from a pot experiment JF - Agricultural and Food Science JA - AFSci VL - 21 IS - 4 SE - Articles DO - 10.23986/afsci.5159 UR - https://journal.fi/afs/article/view/5159 SP - 332-347 AB - <p>We conducted a pot experiment to study the fertilization effects of four N- and P-rich organic waste resources alone and in combination with K-rich bottom wood ash at two application rates (150 kg N ha<sup>–1</sup> + 120 kg K ha<sup>–1</sup>, 300 kg N ha<sup>-1</sup> + 240 kg K ha<sup>–1</sup>). Plant-available N was the growth-limiting factor. 48–73% of N applied with meat and bone meal (MBM) and composted fish sludge (CFS) was taken up in aboveground biomass, resulting in mineral fertilizer equivalents (MFE%) of 53–81% for N uptake and 61–104% for yield. MFE% of MBM and CFS decreased for increasing application rates. Two industrial composts had weak N fertilization effects and are to be considered soil conditioners rather than fertilizers. Possible P and K fertilization effects of waste resources were masked by the soil’s ability to supply plant-available P and K, but effects on plant-available P and K contents in soil suggest that the waste resources may have positive effects under more nutrient-deficient conditions.</p> ER -