Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Organic practices slightly affect corn and soybean yields

07.04.2003


Scientists from the University of Minnesota demonstrated yields of corn and soybeans were only minimally reduced when organic production practices were utilized as compared with conventional production practices. After factoring in production costs, net returns between the two production strategies were equivalent.



More than 80% of corn and soybeans produced in the United States is grown in the Midwest, the vast majority with conventional production practices in a corn-soybean rotation requiring annual synthetic fertilizer and pesticide application. This corn-soybean rotation is practiced on over 100 million acres.

Organic production practices, in compliance with standards defined by the United States Department of Agriculture’s National Organic Program (NOP), offer an alternative production system to conventional practices. The study of the influence of rotation length on yield of corn and soybean when grown utilizing organic and conventional production practices is published in the March-April, 2003 issue of Agronomy Journal, a publication of the American Society of Agronomy.


The study was conducted at two Minnesota locations from 1989 to 1999. Scientists evaluated a two-year corn-soybean rotation and a four-year corn-soybean-oat/alfalfa-alfalfa rotation under conventional and organic management and production strategies.

The analysis of yield data began in 1993, after the first complete cycle of the four-year rotation had occurred. From 1993 through 1999, yield of corn grown in the conventional two-year rotation averaged 143 and 139 bushels per acre at the two locations, while corn grown in the organic four-year rotation averaged nine percent and seven percent less, respectively.

During the same time frame, soybeans grown in the conventional two-year rotation averaged 43.1 and 40.7 bushels per acre, while organically produced soybeans averaged 19 percent and 16 percent less, respectively. Weed control was a major factor for the reduced yields in the organic production system, says Paul Porter, a University of Minnesota agronomist and co-author of the article. The larger yield reductions from organically produced soybeans relative to corn were associated with increased weed pressure in the soybean crop because of its placement in the rotation sequence.

While there was a reduction in both corn and soybean yields in the four-year organic strategy compared with the two-year conventional strategy, the organic strategy had lower production costs than the conventional strategy. Consequently, net returns for the two strategies were equivalent, without taking organic price premiums into account.

Conventionally produced soybeans were more responsive than conventionally produced corn to the expanded rotation length, Porter says. Whereas conventionally grown soybeans in the four-year rotation yielded three to six percent more than soybeans grown in the two-year rotation, conventionally grown corn in the four-year rotation yielded the same to four percent less than corn grown in the two-year rotation. These results suggest conventional soybean yields would be increased when grown in a longer rotation than the commonly practiced two-year corn-soybean rotation.

Agronomy Journal, http://agron.scijournals.org is a peer-reviewed, international journal of agriculture and natural resource sciences published six times a year by the American Society of Agronomy (ASA). Agronomy Journal contains research papers on all aspects of crop and soil science including resident education, military land use and management, agroclimatology and agronomic modeling, extension education, environmental quality, international agronomy, agricultural research station management, and integrated agricultural systems.


The American Society of Agronomy (ASA) www.agronomy.org, the Crop Science Society of America (CSSA) www.crops.org and the Soil Science Society of America (SSSA) www.soils.org are educational organizations helping their 10,000+ members advance the disciplines and practices of agronomy, crop and soil sciences by supporting professional growth and science policy initiatives, and by providing quality, research-based publications and a variety of member services.

Paul Porter | EurekAlert!
Further information:
http://www.agronomy.org
http://www.soils.org
http://agron.scijournals.org

More articles from Agricultural and Forestry Science:

nachricht New research recovers nutrients from seafood process water
31.10.2018 | Chalmers University of Technology

nachricht Plant Hormone Makes Space Farming a Possibility
17.10.2018 | Universität Zürich

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Purdue cancer identity technology makes it easier to find a tumor's 'address'

16.11.2018 | Health and Medicine

Good preparation is half the digestion

16.11.2018 | Life Sciences

Microscope measures muscle weakness

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>