Navigation Links
Study of agricultural watersheds and carbon losses
Date:6/19/2009

MADISON, WI, JUNE 15, 2009 Dissolved organic carbon (DOC) losses from tile drains are an underquantified portion of the terrestrial carbon cycle. This is particularly important in the eastern corn belt where tile drainage dominates the agricultural landscape. Specific land management practices, such as manure application, can play a large role in the export of DOC as soluble organic carbon is applied to or injected into the soil surface. As animal agriculture intensifies in the upper Midwest, measuring DOC exported through tile drains is important when evaluating carbon budgets and carbon sequestration potential.

Scientists at Purdue University have investigated the impacts of manure application, crop rotation, and nitrogen application rate on DOC losses from tile drains. Research was conducted over a six-year span (1998-2004) at Purdue University's Water Quality Field Station, which was designed specifically to measure drainflow and solute losses from agricultural practices. Forty-eight drainage lysimeters were established at the field site in 1992. Twelve field treatments included a restored prairie grass, continuous corn rotations and cornsoybean rotations fertilized at three nitrogen rates, and continuous corn rotations fertilized with lagooned swine effluent applied in the spring or fall of each year. The study was funded by the USDA through Consortium for Agricultural Soils Mitigation of Greenhouses program and through the CSREES-NRI Watershed Processes and Water Resources Grant; the results were published in the May issue of the Journal of Environmental Quality.

The study determined that annual losses of DOC were not affected by any crop management practice. However, when drainage-inducing rainfall occurred with one month of manure application, the monthly DOC concentration of the manured plot was greater than that of non-manured plots. Overall, drainage hydrology was determined to be the largest sole driver of DOC loss. Greater daily drainflows were associated with higher DOC concentrations compared to lower daily drainflows. This indicates that larger storms effectively "flush" DOC from the soil systems.

Dr. Matt Ruark, now an Assistant Professor at the University of Wisconsin-Madison, stated, "Understanding the concentrations and amounts of DOC contributed to surface waters from tile drains is essential for evaluating the overall aquatic ecology of a watershed. This is of particular importance in the eastern corn belt, where up to 80% of the land in agricultural watersheds are tile drained."

Further research is required to evaluate the fate of tile drainageexported DOC once it enters the surface water system. The effect of manure management on the availability of DOC leached into subsurface soil is currently being investigated. Ongoing research at the water quality field station is being conducted to quantify nutrient and contaminant losses in tile drains as a result of manure application and crop rotation.


'/>"/>

Contact: Sara Uttech
suttech@crops.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Related biology news :

1. MSU lands $2.1 million grant to take part in national autism study
2. Study highlights massive imbalances in global fertilizer use
3. Humans related to orangutans, not chimps, says new Pitt, Buffalo Museum of Science study
4. U of Minnesota-led study finds that hunters are depleting lion and cougar populations
5. UBC researchers develop new method to study gambling addictions
6. CU-Boulder study shows Maya intensively cultivated manioc 1,400 years ago
7. IUPUI study finds living near fast food outlet not a weighty problem for kids
8. Study shows transfer of heavy metals from water to fish in Huelva estuary
9. Shortcuts of the mind lead to miscalculations of weight and caloric intake, says Penn study
10. Scientific evidence of health problems from past contamination of drinking water at Camp Lejeune is limited and unlikely to be resolved with further study
11. Wildlife Conservation Society supports worlds first study of egg-laying mammal
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/2/2016)... , Feb. 2, 2016  Based on ... Frost & Sullivan recognizes US-based Intelligent Retinal Imaging ... & Sullivan Award for New Product Innovation. IRIS, ... North America , is poised ... rapidly growing diabetic retinopathy market. The IRIS technology ...
(Date:1/28/2016)... Jan. 28, 2016 Synaptics (NASDAQ: SYNA ), a ... its second quarter ended December 31, 2015. ... of fiscal 2016 increased 2 percent compared to the comparable quarter ... of fiscal 2016 was $35.0 million, or $0.93 per diluted share. ... income for the first quarter of fiscal 2016 grew 9 percent ...
(Date:1/22/2016)... 2016 http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ... the  "Global Behavioral Biometric Market 2016-2020" ... http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced the ... Market 2016-2020"  report to their offering. ... http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced the addition ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... ... , ... LATHAM, NEW YORK... Marktech Optoelectronics will feature their new ... San Francisco’s Moscone Center from February 16-18, 2016, and at the healthcare-focused BiOS Expo ... PIN diode standard packages feature a TO-46 metal can with active areas of 1.0mm ...
(Date:2/10/2016)... ... February 10, 2016 , ... PatientCrossroads announces that ... secure online PatientCrossroads platform, has exceeded both its one-year and overall recruitment goals ... study, which seeks to advance understanding of the hereditary risks for certain kinds ...
(Date:2/10/2016)... ... February 10, 2016 , ... ... announced a new agreement with Singapore-based Global Stem Cells Network (GSCN) and its ... Thailand and Singapore in the latest adipose and bone marrow therapies. , ...
(Date:2/10/2016)... (PRWEB) , ... February 09, 2016 , ... ... services and current winner of the Highest Overall Customer Rating Award from ... all of its business units across the USA, Canada, Mexico and China. , ...
Breaking Biology Technology: