Nutrient uptake efficiency in ryegrass fertilized with dried digestate solids as affected by acidification and drying temperature
Abstract
Aims
To evaluate the efficiency of acidified (to pH 5.5) and dried digestate solids as a fertilization product in a pot experiment with ryegrass.
Methods
The NH4-N pool of the solids was labelled with 15N prior to acidification and drying to estimate plant N uptake efficiency. The effect of digestate solids on plant growth and N and P uptake was compared to the effect of different mineral N-P fertilization combinations.
Results
Non-acidified dried digestate solids showed inferior N fertilization performance compared to their raw and acidified counterparts, and higher drying temperature reduced solids N mineralization. More than 40% of the NH4-N in the raw, raw acidified and acidified dried solids treatments was recovered by the ryegrass over 5-months, similar to recovery with medium mineral N rates, resulting in mineral fertilizer equivalency of 32–41%. Digestate solids treatment altered the water extractable P of the solids, but less so the ryegrass P uptake, mainly due to the buffer capacity of the soil. However, ryegrass P uptake in non-acidified dried solids treatments was probably inhibited by poor growth due to low N availability.
Conclusions
Acidification of digestate solids prior to drying may be an important treatment to maintain the solids fertilizing value while enhancing its manageability.
Keywords
Mechanical separation Ammonia pH Drying method Organic waste Water-extractable phosphorusNotes
Acknowledgements
The research leading to these results received funding from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7/2007-2013/under REA grant agreement no. [289887]. The paper reflects only the authors’ view and the European Union is not liable for any use that may be made of the information contained therein.
Supplementary material
References
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