Phosphorus fertiliser equivalent value of dairy processing sludge-derived STRUBIAS products using ryegrass (Lolium perenne L.) and spring wheat (Triticum aestivum)
Date
2023-12-11Author
Shi, W.
Fenton, Owen
Ashekuzzaman, S. M.
Daly, K.
Leahy, J. J.
Khalaf, N.
Chojnacka, K.
Numviyimana, C.
Warchoł, J.
Healy, Mark G.
Metadata
Show full item recordUsage
This item's downloads: 30 (view details)
Recommended Citation
Shi, W., Fenton, Owen, Ashekuzzaman, S. M., Daly, K., Leahy, J. J., Khalaf, N., Chojnacka, K., Numviyimana, C., Warchoł, J., Healy, M. G. (2023). Phosphorus fertiliser equivalent value of dairy processing sludge-derived STRUBIAS products using ryegrass (Lolium perenne L.) and spring wheat (Triticum aestivum). Journal of Plant Nutrition and Soil Science, n/a(n/a). doi: https://doi.org/10.1002/jpln.202300164
Published Version
Abstract
Struvite, biochar and ash products (collectively known as STRUBIAS) products derived from different waste streams are used as fertilisers in agriculture. Raw dairy processing sludge (DPS) shows promise as bio-based fertilisers, but their secondary STRUBIAS-derived products need testing as fertilisers. The objective of this ryegrass (Lolium perenne L.) and wheat (Triticum aestivum) pot trial was to calculate their phosphorus mineral fertiliser equivalency (P-MFE) using the apparent P
method for Fe-DPS and DPS-derived struvites (Struvite 1 ¿ 4), hydrochars (HC1 ¿ 3) and ash. Results showed that the products can be divided into two groups: (1) a range of products that can (i.e., Struvite 1 ¿ 3) and (2) cannot (i.e., Struvite 4, HC1 ¿ 3, ash and Fe-DPS) be considered as fertilisers. In the first group, the P-MFE ranged from 66.8 to 76.7% for ryegrass and from 77.9 to 93.5% for spring wheat grain. In the second group, the P-MFE ranged from 7.8 to 58.3% for ryegrass and from -34.5 to -151.3% for spring wheat grain. Processing solutions could overcome problems. These may include the avoidance of Fe dosing salts (in the case of struvite) by using biological methods of P removal or the utilisation of oxalic acid during struvite precipitation, which removes Fe from the process chain and produces higher yields. Future policy and research must be aware that not all STRUBIAS products are suitable as fertilisers and therefore need to be tested individually.