Dissolved phosphorus composition of grassland leachates following application of dairy-slurry size fractions

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Fuentes, B., Dixon, E. R., De La Luz Mora, M., Turner, B. L. and Bol, R. 2012. Dissolved phosphorus composition of grassland leachates following application of dairy-slurry size fractions. Journal of Plant Nutrition and Soil Science. 175 (1), pp. 78-85. https://doi.org/10.1002/jpln.201100126

AuthorsFuentes, B., Dixon, E. R., De La Luz Mora, M., Turner, B. L. and Bol, R.

Appropriate management of P from slurry can increase crop production and decrease nutrient loss to water bodies. The present study examined how the application of different size fractions of dairy slurry influenced the quantity and composition of P leached from grassland in a temperate climate. Soil blocks were amended (day 0 = start of the experiment) with either whole slurry (WS), the > 425 mu m fraction (coarse slurry fraction, CSF), the <45 mu m slurry fraction (fine liquid slurry fraction, FLF), or not amended, i.e., the control soil (CON). Deionized water was added to the soil blocks to simulate six sequential rainfall events, equivalent to 250 mm (day 0.2, 1.2, 4.2, 11.2) or 500 mm of rainfall (day 18.2 and 25.2), with leachates collected the following day. The results showed that total dissolved P (TDP), dissolved reactive P (DRP), dissolved unreactive P (DUP), orthophosphate, phosphomonoester, and pyrophosphate concentrations generally decreased with the increasing number of simulated rain events. Total dissolved P was leached in the following order WS > FLF approximate to CSF > CON. Dissolved organic C was correlated with TDP, DRP, and DUP in leachates of all treatments. The highest concentrations of dissolved phosphomonoesters and pyrophosphate (147 mu g P L-1 and 57 mu g PL-1, respectively) were detected using solution 31P-NMR spectroscopy in the WS leachates. Overall, there were significant differences observed between slurry treatments (e.g., relative contributions of inorganic P vs. organic P of dissolved P in leachates). Differences were independent from the rate at which slurry P was applied, because the highest dissolved P losses per unit of slurry P applied were measured in the FLF, i.e., the treatment that received the smallest amount of P. We conclude that the specific particle-size composition of applied slurry influences dissolved P losses from grassland systems. This information should be taken in account in farm-management approaches which aim to minimizing dissolved slurry P losses from grassland systems.

KeywordsAgronomy; Plant Sciences; Soil Science
Year of Publication2012
JournalJournal of Plant Nutrition and Soil Science
Journal citation175 (1), pp. 78-85
Digital Object Identifier (DOI)https://doi.org/10.1002/jpln.201100126
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Fundacion Andes of Chile
Funder project or codeSEF
Processes and mechanisms of the interactions between grasslands and water
Grant IDC14055

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