Pesticides Persist In Ground Water Jul 3, 2008
Comparisons of pesticide concentrations with a variety of environmental variables indicated that redox conditions, ground-water residence times, and the concentrations of dissolved oxygen and excess nitrogen gas from denitrification (the breaking down of nitrogen compounds such as nitrate) were all important factors affecting the concentrations of pesticides and their degradation products in all four ground-water systems. The four sites selected for this study were located in agricultural... (Science Daily)
Moving Forward With Ponded Crops Jun 20, 2008
These saturated areas have likely had N leaching and denitrification as well as impacts on plant health that will show up later in the life cycle, Lauer continues ... Excessive rainfall has also helped move N to below the active root zone, and by now the soil temperatures are such that some loss of N through the denitrification process has taken place, says Nafziger, explaining that denitrification is the conversion of nitrate to N gas, which is lost to the air ... Carrie Laboski, UW-Madison... (Agri-View, WI)
Wisconsin Flooding: Crop, Other Ag Losses Estimated in the Millions Jun 20, 2008
He reported that nitrogen leaching and denitrification will be seen ... In addition, a great percentage of nitrogen has been lost due to leaching and denitrification. (Agri-View, WI)
Torrential Rains Take Toll on Crops Jun 12, 2008
He says flooding and ponding can cause significant loss of soil nitrogen due to denitrification and leaching of nitrate N, causing nitrogen deficiencies and possible additional yield loss. On the other hand, if the corn dies in the ponded areas it probably does not matter how much nitrogen you've lost, he adds. (Agri-View, WI)
More of this story Jun 12, 2008
What about denitrification ... The bottom line - except for major ponded areas, denitrification will probably not be a serious issue, unless the saturated conditions continue. (Tyndall Tribune & Register, SD)
Nutrient Pollution Reductions From Urban Stream Restoration Quantified May 6, 2008
By analyzing those samples, the team was able to determine in-the-field nitrogen reductions by stream microbes through a process known as denitrification ... Getting water out of the stream channel into denitrification "hot spots" in floodplain wetlands helped improve water quality ... The article, "Effects of Stream Restoration on Denitrification in an Urbanizing Watershed," appears in the April edition of Ecological Applications, a journal of the Ecological Society of America. (Science Daily)
Microbes in natural Illinois wetlands help protect water quality, environment May 3, 2008
This process, known as denitrification, reduces the amount of excess nitrate that flows into downstream ecosystems ... When we compared the activity in the natural wetlands to the constructed wetlands, we found that the differences seen in the denitrification rates were correlated to the pattern seen in the microbial community composition ... This suggests that the microbial populations responsible for denitrification have not been restored in the constructed wetlands. (Canton Daily Ledger, IL)
New Method For Combating The Greenhouse Gas Nitrous Oxide Developed Apr 8, 2008
Using the stable natural nitrogen isotope 15N, this mathematical model, which is the most accurate to date, can for the first time calculate exactly the quantities of dinitrogen (N2) produced by the complex biochemical treatment processes anammox and denitrification and the background levels in the atmosphere, according to the researchers writing in the specialist journal Rapid Communications in Mass Spectrometry. This means that in future the effectiveness of such wastewater treatment plants... (Science Daily)
No laughing matter -- bacteria are releasing a serious greenhouse gas Mar 31, 2008
Nitrates can support their respiration, the equivalent of our breathing, and bacteria can get energy through processes called denitrification and ammonification. When they do this nitrous oxide is released into the environment. (EurekAlert!)
When is it time to start planting corn? Mar 29, 2008
Substantial yield reduction due to compaction can be expected; compaction reduces drainage; causes denitrification; and limits the availability of oxygen to the roots. According to Bob Frazee, the most obvious preventative measure is to avoid, if at all possible, both heavy wheel traffic and tillage of soils that are too wet. (Princeton Bureau County Republican, IL)
Fertilizer Runoff Overwhelms Streams and Rivers Mar 15, 2008
"Denitrification is the only process that we know for sure removes nitrogen from water," Mulholland says. "The other 84 percent [of the pollution] was just taken up by algae, microbes and other organisms in the stream bottom. A portion of that is probably also denitrified, and it could be a large portion. But we don't know that fate of that material.". (Scientific American)
First Aid For Fertilizer Sticker Shock Mar 15, 2008
- Delay application - The longer N is in the soil, the more likely that some of it will be lost either by leaching, denitrification, or ammonia volatilization ... Both products protect N from leaching and denitrification losses ... These products can help protect N from loss due to leaching, denitrification, or ammonia volatilization. (Agri-View, WI)
Another Problem with Biofuels? Mar 15, 2008
In a process called denitrification, the microbes convert nitrates in the water into nitrogen gas, which is released into the atmosphere ... So, as runoff from fertilizer increased, the natural denitrification system slowed, and more nitrogen survived untouched to the open ocean worsening the dead zones. (Time.com)
Large Source Of Nitrate, A Potential Water Contaminant, Found In Near-surface Desert Soils Mar 4, 2008
Furthermore, the researchers note that increased soil moisture resulting from climate change increases the potential for "denitrification" -- a naturally-occurring process in soil, where bacteria break down nitrates to return nitrogen gas to the atmosphere. "Denitrification also produces nitrous oxide, a major greenhouse gas," Graham said. (Science Daily)
Melting Snow Provides Clues For Acidification Feb 21, 2008
Tracer results indicated that microbes did not immobilize snowpack nitrate and that other processes such as plant uptake, denitrification, and abiotic nitrate retention were probably more important factors affecting nitrate during snowmelt. More information on controls on nitrogen and sulfur cycling during winter is critical to our understanding of long-term trends and will help us predict how forest ecosystems will respond to future disturbances and global change processes. (Science Daily)
Nitrous Oxide From Ocean Microbes Could Be Adding To Global Warming Dec 13, 2007
"A third of the 'denitrification' that happens in the world's oceans occurs in the Arabian Sea (an area equivalent to France and Germany combined)" said Dr Trimmer. "Oxygen levels decrease as you go deeper into the sea. At around 130 metres there is what we call an oxygen minimum zone where oxygen is low or non-existent. Bacteria that produce nitrous oxide do well at this depth.". (Science Daily)
Sewer board wants to resume Middletown negotiations Oct 25, 2007
To bring in Middletown, the plant would have to expand its capacity - a cost that could run as high as $55 million, including the denitrification plan. Middletown city officials have denied the district's request to pay for a $30,000 consultant's report to assess the needs for the merger without a firm commitment that Middletown would be accepted. (New Britain Herald, CT)
Smithsonian researchers develop models to assess wetland health Sep 15, 2007
But soils in healthy wetlands contain bacteria that remove excess nitrogen by a process called denitrification and can restore water quality. We found that you can predict denitrification potential from some fairly easy-to-measure properties of the soil, such as percent organic matter or pH, said Jordan, who led this portion of the study. (EurekAlert!)
Newswatch, Police/Fire Aug 31, 2007
A little more than $300,000 will be used to study denitrification and nitrogen fixation in the Gulf of California and adjacent waters of the eastern tropical North Pacific. UH documents now on the Web. (Honolulu Star-Bulletin)
A Lot of Corn in State Under Stress; Tips Can Alleviate Producer Anxiety Jul 27, 2007
Early-season flooding and ponding can also result in lost nitrogen through denitrification and leaching. If flooding in corn is less than 48 hours, crop injury should be limited. (Agri-View, WI)
Will nitrogen deficiency affect Midwest corn? Jun 13, 2007
According to Tracy Blackmer, an agronomist with the Iowa Soybean Association, the large amounts of rain and extended wet growing conditions this spring in some parts of Iowa and neighboring states resulted in higher than normal leaching and denitrification of earlier applied nitrogen fertilizers. In addition to wet weather, Blackmer adds that numerous other field and soil conditions, including crop residue levels, soil pH and type of nitrogen fertilizer used, can impact nitrogen availability and... (Mt. Pleasant News, IA)
Cost worries threaten new slowdown on plant Jun 2, 2007
5 million denitrification facility to the plant has been in the works for almost five years, and contract approval for it was set aside again at Wednesday's Town Council meeting after disagreement over the bid package put together by engineering company Metcalf Councilman William Della Vecchia put the brakes on, warning of creeping price increases as the company prepared the bid documents to get the plant built. A lagoon on the building site and the rising cost of materials has already caused... (New Britain Herald, CT)
Voters approve denitrification plant May 9, 2007
5 million bond ordinance for denitrification facility. "Southington is moving in the right direction and doing our part in making for a healthier Long Island Sound," said Town Council Chairman John Barry after the votes were counted. (New Britain Herald, CT)
Southington to vote on denitrification plant May 7, 2007
Voters are being asked to allow the town to appropriate and issue bonds for up to $14,500,000 to build and equip a sewage treatment plant with denitrification facilities and to build a road to the treatment plant ... 5 million bond ordinance for the denitrification facility, Councilors Dolores Longo and Arthur Secondo dissented ... At that meeting, John Pearson, an engineer with Metcalf and Eddy, presented the council with a cost analysis of what the town would pay to the state over a 20-year... (New Britain Herald, CT)
BOF member: Financial plan for future a necessity Apr 24, 2007
5 million construction of a denitrification plant has yet to be added to the bonded debt figure. "This is not a pretty picture. But it's fact, not fiction," Pomposi said. (New Britain Herald, CT)
How much nitrogen is too much for corn? Apr 24, 2007
Researchers believe that these differences represent differences in organic matter that lead to less mineralization and/or more denitrification on poorly drained soils. The results indicate that the Illinois Soil Nitrogen Test can serve as a model for predicting economic optimum nitrogen rates on well- and poorly drained soils and show promise as a tool for nitrogen management. (EurekAlert!)
Tillage Affects Soil Nutrient Availability Apr 6, 2007
No-till and reduced tillage affect nitrogen availability as it causes lower and slower mineralization, greater immobilization, volatilization of ammonia from urea, potential for increased denitrification and overall reduced availability. Comments. (Agri-View, WI)
Cheshire weighs hiring sewer consultant Apr 2, 2007
Electric costs and expenditures on the purchase of methanol have increased after the new denitrification unit at the plant came on line early in 2006; uncertainty over future availability of money from the state Clean Water Fund to help defray the costs of future capital improvements to the wastewater treatment system; and efforts to convert from a flat fee payment system for ratepayers to one based on the level of water consumption. Milone said efforts to develop a new fee structure for... (New Haven Register, CT)
Town Council approves denitrification facility Mar 27, 2007
5 million bond ordinance to build a denitrification facility ... John Pearson, an engineer with Metcalf and Eddy, presented the council with a cost analysis of what the town would pay to the state over a 20-year period for exceeding the amount of nitrogen its sewer treatment plant releases into the Quinnipiac River per day, versus the cost to build a denitrification facility ... The council's hiring of Metcalf and Eddy to research the cost of and propose a design for a denitrification facility... (New Britain Herald, CT)
BOF votes to table denitrification facility Mar 3, 2007
5 million to build a denitrification facility, the Board of Finance unanimously voted to table the matter until its March 14 meeting ... The proposal consisted of comparison analysis of the cost to build the denitrification plant versus continuing to partake in The Nitrogen Credit Exchange Program. (New Britain Herald, CT)
Balancing the denitrification cost Jan 28, 2007
5 million denitrification facility or to gamble on the fact that nitrogen credits will stabilize ... With new mandates to build or pay, Zoni is concerned that many other towns will choose to build, which would eliminate the need to purchase credits and adversely affect any income the town could earn through denitrification. (New Britain Herald, CT)
Nitrogen Fixation: Scientists Solve the Mystery of Life-Sustaining Nutrient Cycle Jan 12, 2007
"These two processes of fixation and denitrification control how much nitrogen is available as a nutrient in the environment," Deutsch explains, adding that "human beings fix about as much nitrogen as the rest of the biosphere on Earth combined.". Specifically, the opposing processes of fixation and denitrification leave marks in the global ratio of nitrate and phosphate, another nutrient, in the water ... Where nitrate is produced by fixation, the ratio will rise above normal as the diazotrophs... (Scientific American)
Ocean Nitrogen Fixation: New Findings Blow A Decade Of Assumptions Out Of The Water Jan 12, 2007
Eventually the fixed nitrogen is returned to its gaseous state, a process called denitrification. Scientists have known for several decades that denitrification occurs in the deep, low-oxygen waters of the Pacific and Indian oceans ... Scientists had estimated that, at those distances, it could take 1,000 years to re-balance the ocean's nitrogen cycle if large-scale changes were to occur in either nitrogen fixation or denitrification -- if climate change altered ocean temperatures and the rates... (Science Daily)
Conservation hearing focuses on potential danger to river Dec 22, 2006
She also asked for adequate denitrification filters to reach greater than permit requirements and "excess holding tanks for up to the full amount of the system's capacity for when there is sewage treatment failure and for when ... runoff flow is more than usual.". F.A.S.T. refers to Fixed Activated Sludge Treatment, a way to treat septic waste, that is sold by Bio-Microbics of Kansas. (Westport Minuteman, CT)
Nano design adjustment may help find, clear some water contaminants Dec 14, 2006
"A current leading strategy is anion exchange, which uses a polymeric resin to exchange an anion for one thats not a problem." (Two other currently used methods aimed at anions are biochemical denitrification and reverse osmosis. . (EurekAlert!)
Ancestor of Animals Breathes Nitrogen Sep 7, 2006
Archaea and bacteria benefit by breathing the stuff in the surrounding mud, turning nitrate into dinitrogen gas and getting rid of their organic waste in the process, a chemical reaction known as denitrification ... The finding marks the first time that more complex animals have been proved to play a role in denitrification, a crucial part of the nitrogen cycle, and have shown an ability to proliferate in anoxic environments. (Scientific American)
Producers Urged To Do Testing Aug 31, 2006
"The fertilizer that wasn't used by the crop this year is still there as nitrate. In years now when we have so little rainfall, we know we didn't lose it by leaching or denitrification." Nitrogen fertilizer rate recommendations are based partly on the nitrate nitrogen that is found in the soil. For every pound that a 2-foot-deep nitrate nitrogen soil test finds, the producer can lower the amount of nitrogen he'll apply by that same amount. (Marshall County Journal, SD)
City asked to do its part to save planet Aug 31, 2006
The "denitrification" processor converts ammonia into nitrogen bubbles that go into the air; dried solids become fertilizer. The price tag is $16 million. (Fresno Bee -- Local)
Housing project lands in court Aug 20, 2006
The proposed project includes 168 one-, two- and three-bedroom units; 299 parking spaces; five three-story buildings, and one denitrification septic system. A denitrification septic system limits the amount of nitrogen introduced into the environment ... If all these people with these signs put in a denitrification system, we would go a long way to fixing Little Pond. (Cape Cod Times, MA)
Tropical forests leak nitrogen back into atmosphere, say scientists May 23, 2006
Rather, isotopic discrimination by microbial denitrification appears to be the major determinant of N isotopic variations across differences in rainfall ... In contrast, in the wettest climates, evidence indicates that denitrification completely consumes nitrate in local soil environments, thus preventing the expression of its isotope effect at the ecosystem scale ... N isotope budgets that account for such local isotopic underexpression suggest that denitrification is responsible for a large... (EurekAlert!)
Satellite Instrument Helps Tackle Mysteries Of Ozone-eating Clouds Apr 11, 2006
NAT PSCs enhance the potential for chlorine activation and can also sediment and irreversibly remove nitrogen from the lower stratosphere, causing a process known as denitrification, which slows the return of chlorine to its inactive form and allows for ozone destruction to continue. H. (Science Daily)
