Improving Soil Organic Matter · Improving Soil Organic Matter “If you can have your soil in...
Transcript of Improving Soil Organic Matter · Improving Soil Organic Matter “If you can have your soil in...
All it took were a few poor vegetable harvests to
convince Mike Werbicky to try something new on the
55-acre family farm he took over from his father in
1985. The soil was in rough shape, sporting gullies and
areas of ponding after rainstorms. Even after irrigating,
the water just didn’t seem to infiltrate well. These
issues persisted despite a change to a wheat/soy
rotation. More change was needed for this St. George
area farm.
Patience pays off Huge improvements in the soil were noticed after Mike
moved to a no-till system a few years ago, especially
once cover crops, such as sorghum, clover, radish and
cereal rye, were integrated into the rotation. Now when
Mike checks his field after a storm, even if the field
was already moist before the rain, it can still absorb
more water. This small change has led to others: the
organic matter levels have risen from 1.6%to 2.1%,
ponding has stopped and soil erosion is no longer an
issue. As Mike proudly explains, “It’s payback time.”
Mike looks forward to many more years of soil
improvement with cover crops in his rotation.
And an added bonus of no-till, according to Mike,
“I save on fuel!”
“Cover crops don’t have to be complicated.”
-Ted Stroh, Wellesley farmer
M i ke We r b i c k y
Stories from the Field:
Improving Soil Organic Matter
“If you can have your soil in better shape
to absorb the water, it’s a win-win.”
Soil that is high in organic matter is darker as seen in the top layer of this soil profile.
FOR MORE INFORMATION
Part of the Great Lakes Agricultural Stewardship Initiative 519-621-2761 or [email protected]
What is soil organic matter? Organic matter consists of plant residues, humus, plant
roots, invertebrates and microorganisms such as fungi
and bacteria.
Why is soil organic matter important? Healthy productive soils need organic matter for:
Soil Nutrients– Organic matter adds crop nutrients
and feeds the microbes needed for nutrient cycling
and storage.
Water holding capacity- Organic matter acts like a
sponge in the soil. It easily absorbs water, making
soils more resistant to drought.
Soil structure aggregation– Organic matter
supports the biological processes that bind soil
particles together into small clumps or aggregates.
The spaces in and between soil aggregates allow
for water and air exchange and promote plant root
growth.
Erosion prevention– Soils with higher organic
matter have greater aggregate stability, making
them more resistant to the erosive forces of wind
and water.
How to build soil organic matter Add organic amendments like manure or compost
Reduce tillage. This slows the breakdown of
residue and minimizes disturbance to soil
microbes.
Diversify your crop rotation or plant cover crops to
increase residue and keep living roots in the soil
longer.
Photo courtesy of USDA NRCS
What should my soil organic matter level be?
This varies by soil type, usually anywhere between 1% and 5%. Higher percentages are needed for good aggregate stability.
Check the table below to see how your fields compare:
Source: http://www.omafra.gov.on.ca/english/crops/pub811/8building.htm
Organic Matter Targets (%)
Soil Texture Productivity Aggregate Stability
Sands and sandy loam
4 3
Loam and silt loam
4-5 4
Clay loam 4-5 7
Clay 4-6 9