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Title

Measurement and estimation of the fertiliser value of pig slurry by physicochemical models: Usefulness and constraints

AuthorsYagüe Carrasco, María Rosa; Bosch-Serra, Ángela D.; Boixadera, Jaume
Keywordscompositional-variability
fertilizer-value
nutrients
physicochemical models
pig slurry
Issue DateFeb-2012
PublisherElsevier
CitationYagüe MR, Bosch-Serra AD, Boixadera J. Measurement and estimation of the fertiliser value of pig slurry by physicochemical models: Usefulness and constraints. Biosystems Engineering 111(2): 206-216 (2012)
AbstractPig slurries (PS) are widely applied to soil as fertilisers. Compositional variability, as shown in this study, is the main constraint on their efficient use. Slurry samples, collected from 126 commercial pig farms were analysed and organic nitrogen (ON), ammoniacal nitrogen (AN), total nitrogen (TN), total potassium (TK), total phosphorus (TP) content, pH, EC (electrical conductivity), DM (dry matter) and OM (organic matter) quantified. Relationships between major nutrient contents of PS and its physical and chemical properties were analysed. AN and TK were linearly related to EC (p < 0.0001) for values lower than 5.6 kg [AN] m−3 and 5 kg [TK] m−3 with coefficients of determination (R2) of 0.86 and 0.58 respectively, in agreement with previous linear models. At higher AN values (which means EC > 40 dS m−1) linearity cannot be maintained, which has important consequences for direct slurry EC measurements. ON and TP in slurries were closely related (p < 0.0001) to DM with R2 of 0.90 and 0.68 respectively.
Description38 Pags., 4 Figs., 5 Tabls. The definitive version is available at: http://www.sciencedirect.com/science/journal/15375110
Publisher version (URL)http://dx.doi.org/10.1016/j.biosystemseng.2011.11.013
URIhttp://hdl.handle.net/10261/44264
DOI10.1016/j.biosystemseng.2011.11.013
ISSN1537-5110
E-ISSN1537-5129
Appears in Collections:(EEAD) Artículos




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