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Temporal changes in labile soil phosphorus pools in grassland receiving P recycled from dairy processing sludge
- Source :
- Soil Security, Vol 13, Iss , Pp 100110- (2023)
- Publication Year :
- 2023
- Publisher :
- Elsevier, 2023.
-
Abstract
- Replacing chemical fertilisers with recycled products will require new advice for phosphorus (P) use.. Emerging P fertilisers derived from dairy processing sludge (DPS) include products such as struvite and hydrochar. A field study monitored temporal changes in available, exchangeable, and Mehlich3 P pools in a P deficient grassland amended with DPS-derived hydrochar and struvite. Herbage P content and yields were compared with data from plots amended with a mineral P fertiliser. Regardless of fertiliser used, there was no statistical difference in dry matter yield. However, herbage P content varied depending on the fertiliser type. The optimal P content in herbage for cattle feed (0.3–0.4 %) was reached using struvite and mineral fertiliser. Application of struvites increased available, exchangeable, and Mehlich3 P, raising the available P levels to the agronomic optimal value for crop production (>5 mg l-1) within one month. In hydrochar amended plots, the optimal level of P was reached 4 months after fertilisation, at the end of the growing season. During the low growth or dormancy period, soil P levels decreased and remained low regardless of the treatment. In the struvite amended plots, available and exchangeable P pools recovered at the beginning of the second season. This effect was not observed in mineral fertiliser and hydrochar amended plots. A single application of struvite can replace mineral fertilisers supplying crops with P for more than one season. This needs to be reflected in the advice for growers to avoid excessive P application and legacy P deposition.
Details
- Language :
- English
- ISSN :
- 26670062
- Volume :
- 13
- Issue :
- 100110-
- Database :
- Directory of Open Access Journals
- Journal :
- Soil Security
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.94357d873a9b472aa52c066ecb19f8b3
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.soisec.2023.100110