Assessment of Fertilising Properties of a Solid Digestate in Comparison with Undigested Cattle Slurry Applied to an Acidic Soil — Oak Academic Publishing
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Assessment of Fertilising Properties of a Solid Digestate in Comparison with Undigested Cattle Slurry Applied to an Acidic Soil
Research Centre for Natural Resources, Environment and Society, Polytechnic Institute of Castelo Banco, CERNAS/IPCB, Castelo Branco, Portugal
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Research Centre for Natural Resources, Environment and Society, Polytechnic Institute of Castelo Banco, CERNAS/IPCB, Castelo Branco, Portugal
1 Research Centre for Natural Resources, Environment and Society, Polytechnic Institute of Castelo Banco, CERNAS/IPCB, Castelo Branco, Portugal
2 Research Centre for Natural Resources, Environment and Society, Polytechnic Institute of Castelo Banco, CERNAS/IPCB, Castelo Branco, Portugal
The use of digestates or cattle slurries as fertilisers could contribute to the recycling of nutrients and organic matter, thus meeting the goals of the circular economy in agriculture. This work aims at evaluating the fertilising properties of a solid digestate (DG) in comparison with undigested cattle slurry (CS) and mineral fertilisation (MF). The experiment was performed in pots with ryegrass ( Lolium multiflorum Lam.) grown in an acidic soil during a 163 days crop cycle. The results showed that throughout the crop cycle neither DG nor CS increased soil organic matter. DG significantly increased (P < 0.001) the sum of the soil exchangeable bases and soil P availability compared with CS or MF. Also, DG significantly increased (P < 0.05) the apparent P recovery of ryegrass (43%) compared with MF (27%). In the first cut, the ryegrass yield was higher in DG and CS than in MF, decreasing in the second and third cuts as a consequence of a decrease in N availability. Nevertheless, the fertilisation with DG or CS could replace the half amount of mineral N fertilisation, without a significant decrease in the ryegrass forage production. In addition, DG enables greater efficiency in the use of P than CS or MF.
KeywordsAgronomic EfficiencyBiogasNitrogen Use EfficiencyPhosphorus Use EfficiencySustainable Agriculture
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