4 research outputs found
Composition, potential emissions and agricultural value of pig slurry from Spanish commercial farms
[EN] Pig slurry is a valuable fertilizer for crop
production but at the same time its management may
pose environmental risks. Slurry samples were collected
from 77 commercial farms of four animal categories
(gestating and lactating sows, nursery piglets and
growing pigs) and analyzed for macronutrients,
micronutrients, heavy metals and volatile fatty acids.
Emissions of ammonia (NH3) and biochemical methane
potential (BMP) were quantified. Slurry electrical
conductivity, pH, dry matter content and ash content
were also determined. Data analysis included an
analysis of correlations among variables, the development
of predictionmodels for gaseousemissions and the
analysis of nutritional content of slurries for crop
production. Descriptive information is provided in this
work and shows a wide range of variability in all studied
variables. Animal category affected some physicochemical
parameters, probably as a consequence of
different slurry management and use of cleaning water.
Slurries from gestating sows and growing pigs tended to
be more concentrated in nutrients, whereas the slurry
from lactating sows and nursery piglets tended to be
more diluted. Relevant relationships were found among
slurry characteristics expressed in fresh basis and gas
emissions. Predictivemodels using on-farmmeasurable
parameterswere obtained forNH3 (R2 = 0.51) andCH4
(R2 = 0.76), which suggests that BMP may be estimated
in commercial farms from easily determined
slurry characteristics. Finally, slurry nutrient composition
was highly variable. Therefore, complete analyses
of slurries should be performed for an effective and
environmental friendly land application.This project was funded by the Spanish Ministry of Science and Innovation (AGL2011-30023) and the Valencian Government (ACOMP/2013/118). We thank the BABEL Project, Building Academic Bonds between Europe and Latin America. Erasmus Mundus Programme Action 2 for PhD fellowships. The translation of this paper was funded by the Universitat Politecnica de Valencia, Spain.Antezana-Julian, WO.; Blas, CD.; García-Rebollar, P.; Rodríguez, C.; Beccaccia, A.; Ferrer Riera, P.; Cerisuelo, A.... (2016). Composition, potential emissions and agricultural value of pig slurry from Spanish commercial farms. Nutrient Cycling in Agroecosystems. 104(2):159-173. https://doi.org/10.1007/s10705-016-9764-3S1591731042Aarnink AJA, Verstegen MWA (2007) Nutrition, key factor to reduce environmental load from pig production. 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Evaluation of Amendments to Control Phosphorus Losses in Runoff from Dairy-Soiled Water
peer-reviewedAmendments with the potential to reduce phosphorus (P) losses from agricultural grassland arising from the land application of dairy-soiled water (DSW) were investigated. Optimal application rates were studied, and associated costs and feasibility were estimated. First, batch tests were carried out to identify appropriate chemicals or phosphorus sorbing materials to control P in runoff from DSW. Then, the best four treatments were examined in an agitator test. In this test, soil—placed in a beaker—was loaded with DSW or amended DSW at a rate equivalent to 5 mm ha−1 (the maximum permissible application rate of DSW allowable in a 42-day period in Ireland). The soil was overlain with continuously stirred water to simulate runoff on land-applied DSW. Optimum application rates were selected based on percentage removal of dissolved reactive phosphorus in overlying water and the estimated cost of amendment. The costs of the amendments, per cubic metre of DSW, increased in the order: bottom ash (1.55 €), alum (1.67 to 1.92 €), FeCl2·4H2O (3.55 to 8.15 €), and lime (20.31 to 88.65 €). The feasibility of the amendments, taking into account their cost, potential adverse effects, public perception, and their performance, decreased in the order: alum > FeCl2·4H2O > bottom ash > lime. Amendments to DSW could be introduced in critical source areas—areas where high soil test P and direct migration pathways to a receptor overlap.Department of Agriculture, Fisheries and Food (Ireland) Research Stimulus Programme 2007 (RSF 07 525