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Advisor(s)
Abstract(s)
The application of manure-based fertilisers (MBFs) is considered an important practice for
achieving agricultural sustainability. However, the potential losses of nutrients to the environment
need to be thoroughly evaluated. This study aimed to assess nutrients’ potential leachability from a
sandy soil, fertilised with MBFs produced by mixing manure from one single animal species with
N- or P-mineral fertilisers, to achieve target N:P ratios (1:1, 2:1 and 0.5:1). MBFs were prepared by
combining pig slurry, cattle slurry or poultry manure with N- and P-mineral fertilisers, or slurryderived
materials, obtained by solid–liquid separation. A leaching experiment was set-up in soil
columns treated with MBFs, for 59 days, with seven leaching events. Poultry manure application
to soil led to higher potential N leaching, while pig slurry induced higher P leaching. All 2:1
MBFs decreased P leaching, relative to the original manure, with the higher reduction (52%) being
observed for pig slurry with urea. The addition of urea to poultry manure also diminished its
potential for N leaching. The behaviour of P-enriched materials, pig slurry solid fraction and both
0.5:1 MBFs obtained with phosphoric acid addition showed a higher risk of P leaching, while the use
of superphosphate as a P-mineral source decreased the risk of P leaching. Concluding, it is possible
to use specific MBFs, enriched with N and P from mineral sources, and have lower N and P leaching
potential, reducing the risks associated with manure soil application, while increasing their interest
as alternative fertilisers.
Description
Keywords
manure-based fertiliser N:P ratio nutrients leachability macronutrients micronutrients nutrients availability
Pedagogical Context
Citation
Prado, J.; Alvarenga, P.; Ribeiro, H.; Fangueiro, D. Nutrient potential leachability in a sandy soil amended with manure-based fertilisers. Agronomy 2023, 13, 990.
Publisher
MDPI