Navigation Links
Understanding phosphorus in soils is vital to proper management
Date:2/4/2009

MADISON, WI, FEBRUARY 2, 2009--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). Results from the study were published in the January-February issue of the Soil Science Society of America Journal.

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.


'/>"/>

Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Related biology news :

1. Understanding extinct microbes may influence the state of modern human health
2. New technique is quantum leap forward in understanding proteins
3. Stowers Institutes Linheng Li Lab expands understanding of bone marrow stem cell niche
4. Understanding how oxidative stress impairs endothelial progenitor cell function
5. Caltech scientists engineer supersensitive receptor, gain better understanding of dopamine system
6. Proteins in sperm unlock understanding of male infertility says new study
7. Hidden infections crucial to understanding, controlling disease outbreaks
8. Better understanding of blood vessel constrictor needed to harness its power for patients
9. Pictures of hot fudge sundaes arouse: Understanding emotions improves our food choices
10. Gaining a better understanding of kidney diseases
11. Do 68 molecules hold the key to understanding disease?
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/3/2017)... A new independent identity strategy consultancy firm ... . Designed to fill a critical niche in technical ... partners Mark Crego and Janice Kephart ... identity expertise that span federal governments, the 9/11 Commission, ... combined expertise has a common theme born from a ...
(Date:1/31/2017)... , Jan. 31, 2017  Spero Therapeutics, ... therapies for the treatment of bacterial infections, today ... of antibacterial candidates from Pro Bono Bio Ltd ... prevalence of multi-drug resistant forms of Gram-negative bacteria.  ... Anti Infectives Ltd, a PBB group company. ...
(Date:1/24/2017)... Jan. 24, 2017 Biopharm Reports has ... laboratory use of nuclear magnetic resonance spectroscopy (NMR). ... and profiled current practices, developments, trends and end-user ... as growth and opportunities. These areas include growth ... instruments, needs and innovation requirements, hyphenated NMR techniques, ...
Breaking Biology News(10 mins):
(Date:2/28/2017)... ... ... ACEA Biosciences, a pioneer in cell analysis instrumentation and the development of ... as the new Vice President of Global Clinical Development. With more than 15 ... will now team with Dr. Li Xu, Chief Medical Officer, and Dr. Xiao Xu, ...
(Date:2/28/2017)... ... February 28, 2017 , ... ... science and biotechnology companies today announced it named Joan Siefert Rose as ... out of Durham, NC and will begin work immediately. , Rose most recently ...
(Date:2/28/2017)... , Feb. 28, 2017 Sangamo ... genome editing, today reported its fourth quarter and ... "Early this year we rebranded our ... clinical development of genomic therapies using our industry ... gene regulation and cell therapy," said Sandy ...
(Date:2/27/2017)... 2017 A Europe-wide survey of institutes conducted ... animals in their research treat them with due care. The survey ... analysis of the results indicates that there is a strong commitment ... into practice the principles of the 3Rs (Refine, Reduce, Replace)  ... What are the ...
Breaking Biology Technology: