Investigation of the inorganic and organic phosphorus forms in animal manure

Journal of Environmental Quality
Paulo H Pagliari, Carrie A M Laboski

Abstract

The most viable way to beneficially use animal manure on most farms is land application. Over the past few decades, repeated manure application has shown adverse effects on environmental quality due to phosphorus (P) runoff with rainwater, leading to eutrophication of aquatic ecosystems. Improved understanding of manure P chemistry may reduce this risk. In this research, 42 manure samples from seven animal species (beef and dairy cattle, swine, chicken, turkey, dairy goat, horse, and sheep) were sequentially fractionated with water, NaHCO₃, NaOH, and HCl. Inorganic (P(i)), organic (P(o)), enzymatic hydrolyzable (P(e); monoester-, DNA-, and phytate-like P), and nonhydrolyzable P were measured in each fraction. Total dry ash P (P(t)) was measured in all manures. Total fractionated P (P(ft)) and total P(i) (P(it)) showed a strong linear relationship with P(t). However, the ratios between P(ft)/P(t) and P(it)/P(t) varied from 59 to 117% and from 28 to 96%, respectively. Water and NaHCO₃ extracted most of the P(i) in manure from ruminant+horse, whereas in nonruminant species a large fraction of manure P was extracted in the HCl fraction. Manure P(e) summed over all fractions (P(et)) accounted for 41 to 69% of total P(0) and 4 to 29%...Continue Reading

References

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Jul 7, 2005·Journal of Environmental Quality·Gurpal S ToorJ Thomas Sims
Oct 31, 2006·Journal of Environmental Quality·Amy L ShoberSheila Gardner

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Citations

Dec 10, 2015·Scientific Reports·Carlos A C do NascimentoHeidi Waldrip
Apr 16, 2015·Journal of Environmental Management·Ariel A SzögiPatrick G Hunt
Apr 11, 2018·Journal of Environmental Quality·Lidong HuangBarbara J Cade-Menun
Feb 13, 2018·Environmental Science & Technology·Rixiang HuangYuanzhi Tang

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