| Title |
Contrasting Phosphorus Build-up and Drawdown Dynamics in Soils Receiving Dairy Processing Sludge and Mineral Fertilisers |
| ID_Doc |
12439 |
| Authors |
Khomenko, O; Fenton, O; Leahy, JJ; Daly, K |
| Title |
Contrasting Phosphorus Build-up and Drawdown Dynamics in Soils Receiving Dairy Processing Sludge and Mineral Fertilisers |
| Year |
2024 |
| Published |
Journal Of Soil Science And Plant Nutrition, 24.0, 1 |
| DOI |
10.1007/s42729-023-01585-w |
| Abstract |
Sustainable utilisation of waste from the food industry is required to transition to a circular economy. The dairy industry relies on high phosphorus (P) inputs and produces large quantities of P-rich dairy processing sludge (DPS). Recycling DPS into P fertilisers provides an opportunity to decrease the reliance on chemical P fertilisers. However, current soil nutrient management planning (NMP) is based on chemical P and does not account for recycled alternatives. A pot trial using a novel isotope pool dilution technique was used to describe build-up and drawdown cycles of P in soils fertilised with DPS. Changes in available, exchangeable, and Mehlich3 P (M3-P) pools were recorded over 36 weeks of grass growth. Results demonstrated that in the period of high P demand (12 weeks), these P pools were depleted. As crop growth and demand decreased, available P recovered through mobilisation of P from exchangeable P and M3-P reserves. DPS allowed available P to recover and build up to agronomic target levels after 24 weeks. Using DPS, build-up of available and exchangeable P was slower but P use efficiency was higher at stages of slow growth. Dairy waste created a more stable P pool which could be utilised by crops over a growing season indicating that NMP needs to account for this in the decision support for growers. Isotope studies revealed that extractive agronomic tests do not capture drawdown in P reserves. |
| Author Keywords |
Phosphorus; Soils; Dairy processing waste; P availability; Exchangeable phosphorus; Recycled P |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001148083300001 |
| WoS Category |
Plant Sciences; Environmental Sciences; Soil Science |
| Research Area |
Plant Sciences; Environmental Sciences & Ecology; Agriculture |
| PDF |
https://link.springer.com/content/pdf/10.1007/s42729-023-01585-w.pdf
|