Carolina clay |
As I’ve mentioned in other blogs, we’ve lived in North Carolina for about 21 years – making us almost native. I love this area and consider myself a “Carolina girl”. The weather is wonderful, the people so friendly … but the one thing that has almost brought me to my knees is the RED CLAY SOIL! Stick your shovel in that, and it’s like picking up a sticky brick. And for those of you reading this blog who have not had the pleasure of laundering your children’s clothes after they’ve played outside in that red clay … it ain’t no picnic. Gardening with such soil can cause some heartache, too. The clay is so dense that it often seems like the only thing it will grow is weeds.
Well here comes my secret weapon … my husband! He’s a soils engineer who specializes in clay liners for landfills and racetracks. Chris also is an unofficial scientist and hands-on farmer. How convenient! I’m going to interview him about conditioning your soil for this week’s blog. It is that time of the year to get your garden ready so hopefully this will inspire you to get out your shovel.
So Chris…why is this
Carolina Clay so hard to garden in?
The clay soils in the Carolinas can have
good nutrients, but the high clay content makes it hard to till, plant and
condition with organic materials. Clay is a fine-particle material where water
particles are bound to the soils, making it hard and blocky. Another problem is
that clay soils tend to trap and preserve weed seeds for many years. When older
clay soils are tilled, these weed seeds obtain moisture and sprout fresh weed
seedlings.
What can a gardener do to
get the soil in better shape?
Three main things: first, adjust the pH higher
by adding lime; second, till in more organic matter to provide flow pathways for
nutrients and root growth; and third, develop a system to regularly condition
the soils with green and/or composted brown manure to increase natural
nutrients that feed the plant roots.
What should the pH of my
soil be? And how do I achieve that? Most plants thrive in a soil pH from 6.5 to
7.5. The best way to achieve that pH is to break up the clay and add a
combination of pelletized lime and gypsum (CaSO4). Then to maintain a healthy
pH, add lots of natural organic matter and nutrients with compost or composted
manure.
You have mentioned
compost, green manure or composted brown or farm-animal manure. What do you
mean by these terms?
Our son, Benjamin, in compost pile |
Green manures are cover
crops like clover and greens that are grown with the intention of turning them back
into the soil. Green manures tend to suppress weeds and prevent erosion and
nutrient runoff in areas that would otherwise be unplanted. Green plants can
assist with creating good soil structure and food for the microbes, once they
are tilled in and begin to decompose.
Brown or farm animal
manure (from cows, chickens, goats, etc.) can be used in compost, but as explained
above the compost should be turned on a regular basis to aerate and increase
temperatures to allow the decomposition process to be completed before using in
a vegetable garden.
Finished compost that contains brown or animal manure will
have that healthy crumbly and earthy smell that is common of processed potting
soil. It typically takes one to three months for animal manure to compost
adequately in the summer months, and four to six months in the winter months.
If you have any doubts about your compost developed from farm animal or plant
manure, it is best to consult a soil scientist or composting specialist to make
sure it is safe in vegetable gardens.
Nutrient-rich finished compost, ready for the garden |
Should I get rid of all
my Carolina clay?
In my opinion NO!
Carolina clay soils also retain water during drought conditions and grow
wonderful tasting vegetables – especially tomatoes and squash. If the blocky
structure of the clay soils can be broken up and managed with the addition of
lime and/or gypsum, organic matter or compost, then even red Carolina clay soils
can be excellent for vegetable gardens and small-scale farming. The most
important thing, like a sustainable-farming lifestyle, is balance. Of course, a
balanced soil conditioning and pH adjustment program takes time and.... That’s
Farming.
About Jeffie and Chris Hardin
– The Hardins left suburban life in 2001 for an 8-acre farm near Mountain
Island Lake. Now the Hardins and their children seek to grow half of their
family’s food and help others grow food, too.
1 comment:
This is great information as we approach the growing season. The red clay soil is such a challenge to would be gardeners.
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