| The aim of our research was to compare the N fertilizer value of different clover-grass (CG) based fertilizers. A pot trial was set up with 8 treatments with Lolium perenne: fresh CG, ensiled CG, compost from CG, solid manure and liquid manure from dairy cows fed with CG, biogas digestate, an unfertilized and a mineral fertilizer control. Our hypothesis was that compared to composting, and to other treatments (e.g. silage) biogas digestates allow for a more efficient N fertilization due to a lower C/N ratio and a higher share of NH4 +. Dry matter yield, C/N ratio, N concentration, N release and Nitrogen use efficiency (NUE) were examined. The results show the highest overall NUE, N release and yield in the treatment with biogas digestate and the lowest... |
