By Logan Garner
Logan is the Water Quality and Initiatives Program Manager for the Indiana State Department of Agriculture-Division of Soil Conservation.
Unless you’re not involved with agriculture in Indiana,
you’ve probably heard the term “soil health” countless times. We are fortunate to live in a state where so
many farmers are focusing on the improvement of our soils, and are adopting the
paradigm that healthy soils mean good things for their crops, their wallets and
the natural resources which sustain both.
Still, not everyone sees the benefits of building soil
health. There are some misconceptions
about soil health as a goal which may give the impression that it does not
apply to them. For instance, some
growers still ask, “if I put nutrients in my soil, then it isn’t my soil
healthy?”
While putting nutrients on the ground does allow for greater
nutrient availability to plants, it does not improve the soil’s inherent ability to function. Soil health is not just about how much
Nitrogen, Phosphorus or Potassium is available to a crop, but how well the soil
as an ecosystem exchanges those
nutrients, how well it allows water (as well as nutrients and air) to
infiltrate below the surface of the ground, and how much water holding capacity
lies in the soil’s structure.
Photo by Martha Miller |
An excellent gauge of all these abilities is the level of organic matter in the soil. Organic matter in the soil is ultimately a
measure of carbon in the soil, but there’s more to it than that. When carbon levels in the soil are rising, it
means that things are living and metabolizing there. Bacteria, insects, earthworms and fungi all
play specific roles in facilitating nutrient exchange and availability for
plant roots to tap into, and in this case the more really is the merrier. Building organic matter also allows pores in
the soil to hold its structure, which means more water can flow through the
soil, and more water fills those pores.
Another way to say all that is “better infiltration and greater
water-holding capacity leads to better water availability to the crop.”
Photo by Martha Miller |
If all this is true, then why hasn’t everyone been doing
this for years? There’s no easy answer
to this, but there are some key indicators.
First and foremost, there is little research on soil health. A search of academic journals will quickly
show that the term “soil health” is just that—a term. However, the importance of the role of soil
organic matter in soil’s capacity to sustain crops is well known. While this lack of data on soil health may
seem like a small hurdle to those who see the real, practical benefits from
building soil health, it’s a flag to individuals who want to “see the numbers”
before exploring the issue. We all ought
to be asking those individuals, “If given the choice between soil with low
organic matter and soil with high organic matter, which would you choose?” I don’t think a single person would pick the
former.
Soil health is about the process needed to build organic
matter, bottom line. And that’s what the
Indiana Conservation Partnership efforts are all about. It’s also the end result of conservation
cropping practices like a no-till and cover crop farming regimen. It’s not about conservation program
enrollment. It’s not about participation
in cropping initiatives. Those things
are tools (excellent ones, at that) which aim to reach the goal: building soil
organic matter that is inherently good for production, economy and the
environment.
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