|Dou, Zhengxia -|
Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: February 3, 2010
Publication Date: July 1, 2010
Citation: He, Z., Dou, Z. 2010. Phosphorus forms in animal manure and the impact on soil P status. In: Dellaguardia, C.S., editor. Manure: management, use and environmental impacts. New York, NY: Nova Science Publishers. p. 83-114. Technical Abstract: Increased knowledge of manure P chemistry is needed to optimize recycling and minimize adverse environmental effects associated with land application of manure. Part I of this chapter reviews and discusses various manure P characterization methods including sequential fractionation, solution 31P nuclear magnetic resonance (NMR) spectroscopy, enzymatic hydrolysis, and solid state spectroscopic techniques. We then present a case study on comparison of P forms in conventional and organic dairy manure identified by solution and solid state 31P NMR spectroscopy. This case study indicates that the lability of P may differ between organic and conventional dairy manures, therefore specific managements should be adapted for organic dairy manure. Part II of the chapter focuses on the impacts of manure application on soil P status. For this part we present and discuss the results of laboratory aerobic incubation and field agricultural soils to evaluate the short- and long-term impacts, respectively. The lack of stable organic P in relevant extracts of the laboratory or field soils with manure amendment indicates degradation of stable manure P. Sequential fractionation of pasture soils reveals that the levels of labile P are more related to the number of years receiving poultry litter, whereas the levels of stable P are related to the cumulative amount of poultry litter applied. The two different impact patterns imply that the impact of manure application on environment (runoff potential) should be gradually weighed in with increasing application years.