The Organic Center has researched a new method to quickly and cost-effectively track
changes in soil quality brought about by the transition to organic
farming.
Alan
Franzluebbers, Ph.D. and Richard Haney, Ph.D., two leading soil
scientists working for the Agricultural Research Service, the research
arm of the U.S. Department of Agriculture, wrote The Organic Center's
Critical Issue Report (CIR 2006.2),
"Assessing Soil Quality in Organic Agriculture." The full report is available for free at:
http://www.organic-center.org/science.environment.php.
The
report explains why better tools are needed to manage the transition of
soils when farming methods change from chemical-based to organic.
"How
we manage soil and how the soil responds to this management are
critical issues facing the long-term success of our society," says Alan
Franzluebbers, ecologist with the USDA-Agricultural Research Service in
Watkinsville, Georgia and co-author of the report. The proposed
minimum-data-set (MDS) approach for assessing soil quality is composed
of routine chemical and biological assays that can be carried out in
most soil testing laboratories for a collective cost of less than $100
per sample.
In 2007, The Organic Center plans to begin a
national survey of soil quality on conventional, transitional and
organic acreage. The Center's project will apply, test and refine the
MDS approach, and integrate the measures into an index of soil quality.
"Farmers and scientists have recognized for decades that
well-managed organic systems improve soil quality," says Chuck
Benbrook, Ph.D., and chief scientist of The Organic Center. "But better
tools and solid data are needed to quantify these benefits and identify
the best strategies to maximize them."
The degradation of soil
quality continues in the United States as a result of erosion, the
compaction of soils, leaching of nutrients, and loss of soil structure
and biodiversity.
Organic farming methods have great potential to
reverse these losses by increasing soil organic matter content,
building the pools of nutrients cycling within soils, and enhancing
soil microbial communities. The Organic Center's work on soil quality
seeks to accomplish two goals.
First, development of practical
tools for farmers, crop consultants, extension specialists, and
agronomists to use in the field in mapping the course for
cost-effective transitions from conventional production to organic
management. New tools are needed to determine how quickly a soil can be
transitioned, how resilient the soil is likely to be during the
transition process, and how soils and crop yields are likely to respond
to key organic farming practices and inputs. Soil microbial activity,
in particular, can offer a benchmark for transitioning from
conventional to organic farming systems.
"There is a need to
provide farmers with a soil test tool to guide a cost-effective
transition," says Richard Haney, soil chemist with the
USDA-Agricultural Research Service in Temple, Texas. "Microorganisms
are very sensitive to changes in the soil and we can take advantage of
this fact by tracking the impact our management practices have on soil
microbes."
The Organic Center's second goal is to develop
methods to quantify the benefits to farmers, rural communities, and the
nation from improvements in soil quality possible through organic
management. Key benefits that will follow expansion of organic
production, and which need to be quantified, include: increased
efficiency of nitrogen use; less reliance on purchased sources of
nutrients; reduced runoff and leaching of nutrients and pesticides, and
hence improved water quality; more stable crop yields; and higher
returns to farm labor and management.
The Organic Center's next
Critical Issue Report focusing on soil quality will be released in the
spring, 2007. It will address the potential of organic farming systems
to increase the efficiency of nitrogen use in corn production in the
Midwest.
The Organic Center is a 501 (c) (3) organization
founded in 2002 to present and provide peer-reviewed scientific
evidence on how organic products benefit human and environmental
health. The Organic Center's research and educational efforts are
funded through individuals, foundations, businesses and government
programs.
For information about The Organic Center, its current
programs and scientific reports visit
www.organic-center.org.