Effects of different treatments of cattle slurry manure on water-extractable phosphorus
Chapuis-Lardy, L. ; Temminghoff, E.J.M. ; Goede, R.G.M. de - \ 2003
Netherlands Journal of Agricultural Science 51 (2003)1-2. - ISSN 0028-2928 - p. 91 - 102.
rundveemest - rundveedrijfmest - behandeling - fosfor - toevoegingen - oplosbaarheid - chemische eigenschappen - waterverontreiniging - mestverwerking - cattle manure - cattle slurry - treatment - phosphorus - chemical properties - additives - solubility - water pollution - manure treatment - runoff phosphorus - animal manure - nitrogen - soil - netherlands - strategies - management - excretion - recovery - losses
Cattle slurry manure applied to land increases the risk of phosphorus (P) movement to surface waters, which may lead to eutrophication. The water-extractable fraction of P in slurry manure is correlated with P concentration in runoff from soils amended with slurry smanure, and thus is an effective indicator of environmental P loss. We evaluated the water-extractable P (WEP) and readily soluble P (RSP; i.e., P extractable in a single water extract) contents in slurry manure from nine farms. On some farms, the additive Euromestmix® (MX) is used to complex N-compounds in the slurry manure, but the effect of MX on P in the slurry manure is not known. We also focused on methodological factors affecting the measurement of P in slurry manure. Drying the slurry manure before analysis decreased WEP and RSP contents. Dilution of slurry manure by varying the dry matter-to-distilled water ratio increased the water-extractable fractions. Analysis of calcium and magnesium contents in water showed that these minerals are involved in the release of P in water. Total RSP content of slurry manures from the nine farms ranged from 1.83 to 4.06 mg P per g dry matter. A substantial portion of total P in the slurry manure occurred in the water-extractable (46–71%) and the readily soluble P fractions (24–51%). The addition of MX tended to decrease the readily soluble inorganic P content of slurry manures.