The fertilizers are a major reason why agriculture is a significant source of both greenhouse gas emissions and pollution in estuaries like the Gulf of Mexico and the Chesapeake Bay. If growers apply too little fertilizer, it reduces crop yields. But if they apply too much, the excess can be released into the atmosphere as nitrous oxide or leach into waterways as nitrate.
Jorge Delgado, with the Agricultural Research Service (ARS) Soil Plant Nutrient Research Unit in Fort Collins, Colo., conducts research to help growers determine exactly how much nitrogen to apply to a field, when to apply it and what alternatives might work best. The right approach can vary from one location to the next and one crop to the next.
ARS is USDA's principal intramural scientific research agency, and this research supports the USDA priorities of responding to climate change and promoting agricultural sustainability.
Delgado helped develop a tool designed for fledgling "environmental trading" credit programs that reward growers for reducing nitrogen losses. Known as the "Nitrogen Trading Tool" (NTT), it can be used to determine how much a proposed management practice may be able to reduce nitrogen losses, and how much "trading credit" could be earned by switching to it.
The concept of trading nitrogen credits is in its formative stages, but efforts have been established in Pennsylvania and Ohio, with municipalities and state environmental agencies in several states and watersheds studying the concept.
Delgado has distributed the NTT and other tools to hundreds of users, including farmers, agribusinesses, scientists, extension agents, state and federal agencies and international users. He also has used them to convince growers to improve soil-management practices by using conservation tillage, crop rotation and cover crops such as wheat, rye and other grasses. Such practices not only prevent nitrates from leaching into waterways, but prevent soils from eroding and keep carbon and nutrients sequestered in the soil.
Delgado also has published a peer-reviewed report in Advances in Agronomy showing how the NTT may be used to calculate the potential for nitrogen trading on a Virginia no-till operation, an Ohio farm where manure is applied, and irrigated barley and potato fields in Colorado. His efforts to reduce nitrogen losses in Mexico also have been published in the journal Terra Latinoamerica.
Read more about this research in the September 2011 issue of Agricultural Research magazine.
Dennis O'Brien | EurekAlert!
Forest Management Yields Higher Productivity through Biodiversity
14.10.2016 | Technische Universität München
Farming with forests
23.09.2016 | University of Illinois College of Agricultural, Consumer and Environmental Sciences (ACES)
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
24.10.2016 | Earth Sciences
24.10.2016 | Life Sciences
24.10.2016 | Physics and Astronomy