Ajiboye B, Akinremi O O, Racz G J
Department of Soil Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
J Environ Qual. 2004 May-Jun;33(3):1062-9. doi: 10.2134/jeq2004.1062.
This study was performed to determine the forms of P and to examine the influence of oven-drying on P forms in different organic amendments. Samples of biosolids, beef and dairy cattle manures, and hog manures from sow and nursery barns were used in this study. Both fresh and oven-dried amendments were analyzed for inorganic (Pi), organic (Po), and total phosphorus using a modified Hedley fractionation technique. Water extracted about 10% of total biosolids P and 30 to 40% of total hog and cattle manure P. The amount of P extracted by NaHCO3 ranged from 21 to 32% of total P in all organic amendments except in the dairy cattle manure with 45% of total P. The labile P fraction (sum of H2O- and NaHCO3-extractable P) was 24% of biosolids P, 60% of hog manure P, and 70% of dairy cattle manure P. The residual P was about 10% in biosolids and cattle manures and 5 to 8% in hog manures. Oven-drying caused a transformation in forms of P in the organic amendments. In hog manures, H2O-extractable Po was transformed to Pi, while in the dairy manure NaHCO3-extractable P was converted to H2O-extractable Pi with oven-drying. Therefore, caution should be exercised in using oven-drying for studies that evaluate forms of P in organic amendments. Overall, these results indicate that biosolids P may be less susceptible to loss by water when added to agricultural land.
本研究旨在确定磷的形态，并研究烘干对不同有机改良剂中磷形态的影响。本研究使用了生物固体、肉牛和奶牛粪便以及母猪和保育猪舍的猪粪样本。采用改良的Hedley分级技术对新鲜和烘干的改良剂进行无机磷（Pi）、有机磷（Po）和总磷分析。水提取了约10%的生物固体总磷以及30%至40%的猪和牛粪总磷。除奶牛粪便中总磷的45%外，在所有有机改良剂中，NaHCO3提取的磷量占总磷的21%至32%。不稳定磷组分（H2O和NaHCO3可提取磷之和）占生物固体磷的24%、猪粪磷的60%和奶牛粪便磷的70%。生物固体和牛粪中的残留磷约为10%，猪粪中的残留磷为5%至8%。烘干导致有机改良剂中磷的形态发生转变。在猪粪中，H2O可提取的Po转化为Pi，而在奶牛粪便中，烘干后NaHCO3可提取的磷转化为H2O可提取的Pi。因此，在使用烘干法评估有机改良剂中磷的形态的研究中应谨慎。总体而言，这些结果表明，生物固体磷添加到农田后可能较不易因水而流失。
