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Understanding Phosphorus In Soils Is Vital To Proper Management

Date:
February 6, 2009
Source:
Soil Science Society of America
Summary:
Phosphorus can have a significant effect on water quality, entering these water sources in a variety of ways, particularly due to runoff from phosphorus enriched soil. A new study examined the characteristics of phosphorus in soils as a way to understand how it behaves in soils and how it is transported in runoff.

Phosphorus is one of the key nutrients that can cause algal blooms and related water quality problems in lakes, rivers, and estuaries worldwide.  Phosphorus entering waters originates from a variety of sources. 

Agricultural land receiving long term applications of organic by-products such as animal manure is one of the major contributors.  Such soils often become enriched with P, leading to elevated P loss through erosion and runoff.  Information on the chemical characteristics of P in these soils is essential to improving our understanding of how P behaves in soils and how it is transported in runoff to devise better management practices that protect water quality.

A group of scientists in the USA and Australia have identified the chemical forms of P, using 31P nuclear magnetic resonance (NMR) spectroscopy, in soils receiving organic by-products for at least eight years (treated) as compared with soils not receiving P application (untreated).

Regardless of the type of organic materials applied (dairy, swine, poultry, or spent mushroom compost), orthophosphate (inorganic P) was the single dominant P form, more so in treated soils (79-93% of total P) than in untreated soils (33-71%).  Orthophosphate was also the only P form that differed dramatically between paired soils, three to five times greater in treated than untreated soils.  Other P forms included condensed inorganic P and various organically bound P groups; however, their amounts were relatively small and differences between each paired soils were insignificant.

Surprisingly, the study revealed no evidence of phytate-P accumulation in any of the soils receiving organic wastes.  Phytate is an organic storage form of P that is known to be present in animal manures, in particularly large proportion (up to 80% of total P) in poultry manure.  Phytate-P is generally considered to be recalcitrant in the agroecosystem because of its chemical structure.  However, the lack of phytate-P accumulation in several soils receiving poultry manure in this study indicates that manure-derived phytate-P may not be biologically and environmentally benign.  

Zhengxia Dou, the lead author, stated “in terms of potential P loss in the long run, organic materials containing large amounts of phytate-P such as poultry manure may not differ from other material containing mainly inorganic P”.  Andrew Sharpley, a collaborating scientist, further explained “when the soils’ P sorption capacity was nearly saturated after years of manure application, phytate or other organic P forms could be exposed to breakdown and potential loss”.  Therefore, it is important to strive towards balancing P inputs with outputs and to prevent P from building up in soils to which manure is applied.      


Story Source:

The above story is based on materials provided by Soil Science Society of America. Note: Materials may be edited for content and length.


Journal Reference:

  1. Dou et al. Phosphorus Speciation and Sorption-Desorption Characteristics in Heavily Manured Soils. Soil Science Society of America Journal, 2009; 73 (1): 93 DOI: 10.2136/sssaj2007.0416

Cite This Page:

Soil Science Society of America. "Understanding Phosphorus In Soils Is Vital To Proper Management." ScienceDaily. ScienceDaily, 6 February 2009. <www.sciencedaily.com/releases/2009/02/090204112235.htm>.
Soil Science Society of America. (2009, February 6). Understanding Phosphorus In Soils Is Vital To Proper Management. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2009/02/090204112235.htm
Soil Science Society of America. "Understanding Phosphorus In Soils Is Vital To Proper Management." ScienceDaily. www.sciencedaily.com/releases/2009/02/090204112235.htm (accessed August 21, 2014).

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