Corn Ethanol: More Water Pollution

  • Corn requires more fossil fuel-based nitrogen fertilizer than many other crops. Tanks of pressurized anhydrous ammonia fixes nitrogen in the soil, but heavy rains can wash nitrogen into waterways. (Photo by Lester Graham)

Government-funded programs that pay for
conservation on farmland have done a lot to
improve the environment over the past twenty
years. The federal government has paid farmers
to take some cropland and set it aside to protect
waterways and wildlife habitat. In the second of
our two-part series on ethanol, Julie Grant reports
that some of that conservation is being stalled:

Transcript

Government-funded programs that pay for
conservation on farmland have done a lot to
improve the environment over the past twenty
years. The federal government has paid farmers
to take some cropland and set it aside to protect
waterways and wildlife habitat. In the second of
our two-part series on ethanol, Julie Grant reports
that some of that conservation is being stalled:


A good hard rain can wash a lot of valuable soil off a farm field.
John Wallbrown grows corn and soybeans on his farm. He says losing
soil is just like losing money. The soil carries with it all the
nutrients he’s put in the fields to help the crops grow, things such as
nitrogen and phosphorous. Wallbrown says he’s put in a good number of
grass waterways through the fields to help filter the water and hold on
to that soil:


“And so when you put in a grass waterway, it dramatically reduces the
amount of erosion. And it is just better for the water supply, better
for our crop. We’re keeping our soil in our field as opposed to it
getting put away.”


What Wallbrown calls nutrients in the field are considered pollution
once they wash into rivers and lakes. So Wallbrown says planting grass
near waterways is good for everyone. Except it means he’s got to use
land that otherwise could be growing crops, and that’s a loss of
income.


Wallbrown has gotten various government assistance to offset those
losses. The largest program, is called the Conservation Reserve Program, known as the
CRP for short.


John Johnson is with the US Department of Agriculture. He says when
you add up all the farms like John Wallbrown’s around the country, the
CRP is making a huge difference in reducing agricultural runoff into
waterways:


“Over 450 million tons of topsoil annually are prevented from eroding
because of CRP. We’ve got lots of really good benchmarks and measurements of
success of CRP, in both water quality, soil erosion and wildlife
habitat.”


But that set-aside land is in demand these days. There’s been a huge
call for bio-fuels to help reduce American dependence on foreign oil.
Bio-fuels are made from crops such as soybeans and corn, especially
corn. So Johnson says the government has decided to stop enrolling
new farmland into the conservation program:


“The overriding concern was that there is a need for a larger supply of
corn and soybeans and wheat production right now, so given the need for
that production, let’s just take a pause right now from enrolling large
acreage of additional farmland into the CRP.”


Corn is used to make ethanol, a fuel that’s now commonly blended with
gasoline. That’s caused corn prices to nearly double so farmers say
they’re planting 12 million acres more corn this year than last year.
That’s the most corn grown in the US in more than 50 years.


Ralph Grossi, director of the American Farmland Trust, says corn needs a
lot more nitrogen fertilizer than other crops. And when it rains,
nitrogen moves quickly from the fields to the waterways. That’s
especially true when grass strips don’t filter the runoff.


Grossi says that nitrogen drains into creeks and rivers from 36 states
into the Mississippi River and eventually to the Gulf of Mexico. There
it causes huge algae blooms that then die, sink, and the decaying
matter causes low oxygen in the water called hypoxia. That’s why the
Corn Belt has been blamed for creating a huge dead zone in the Gulf of
Mexico each year:


“If you increase corn production and don’t add the conservation practices
it will add nutrients and exacerbate problems in the gulf with hypoxia.
But it’s not just in the gulf, it’s problems for every local water
district that has to purify water for drinking and other urban
purposes. As they have to contend with more nutrients, that increases
their costs of cleaning the water.”


Grossi says the best place to clean the water is at the source. He
says that’s why the government must continue to help farmers pay for
grass waterways and buffer strips – those things prevent farm nutrients
from getting into the water in the first place. He says the need for
grass waters is even greater now that so much farmland is being planted
in corn to meet the demand for more ethanol.


For the Environment Report, I’m Julie Grant.

Related Links

Paying for Ponds to Stem Farm Runoff

  • Alan Roberson's pond traps sediment. Before the pond was built, silt washed into a creek and caused problems farther downstream. (Photo by Lester Graham)

Since the dust bowl days of the 1930s Depression, the government has been working with farmers to reduce erosion. Today, soil conservation is better. But fields still lose a lot of topsoil because not all farmers use the best conservation methods. Dirt is washed away by rain. That silt clogs up streams, rivers and lakes. But one region is trying to intercept the silt before it gets to the river system. The GLRC’s Lester Graham reports:

Transcript

Since the dust bowl days of the 1930s Depression, the government has been working with
farmers to reduce erosion. Today, soil conservation is better. But fields still lose a lot of
topsoil because not all farmers use the best conservation methods. Dirt is washed away
by rain. That silt clogs up streams, rivers and lakes. But one region is trying to intercept
the silt before it gets to the river system. The GLRC’s Lester Graham reports:


Farm fields in all or part of 38 states drain into the Mississippi River. Some of the
tributaries of the Mississippi are so silted that dredges have to operate around the clock to keep river
shipping lanes open.


The Sangamon River in central Illinois is not big enough for shipping cargo, but it does
run into the man-made Decatur Lake. The city of Decatur gets its water from that lake
and often has to dredge it to keep the water inlets from clogging up.


Keith Alexander is the Director of Water Management for the city of Decatur, Illinois.
He says a little soil erosion on enough farms adds up:


“And the drainage area that runs into the lake is 925 square miles of some of the world’s
best topsoil. We have literally a half-a-million acres of corn and soybean fields that flow
into our lake that we use for drinking water purposes.”


Not only does the silt clog the lake, it also carries fertilizers and pesticides with it,
polluting the lake. The city has offered farmers financial incentives to reduce soil
erosion. But it hasn’t gotten enough participation from farmers to solve the problem. So,
the City of Decatur decided to try another approach. They would offer money to landowners to build ponds. Those ponds would be located in key drainage areas next
to farm fields.


Shannon Allen is a watershed specialist with the Macon County Soil and Water
Conservation District. He says it turned out to be a pretty popular program:


“The landowners wanted it for recreational purposes, obviously fish, maybe swimming
or whatever. We’re putting them in so we can collect sediment from the farm fields
above them so they don’t go into the river system.”


Shannon Allen says the ponds work a lot better at keeping silt out of creeks and rivers and lakes
than other methods to reduce erosion.


“Basically ponds collect 90% of the silt. And, so anytime you can put up a pond, you’re
doing better than a grassed waterway or a terrace that don’t reduce sediment loads by that
much.”


The city offers up to 5,000 dollars to landowners, but that’s well short of the actual cost. A typical pond
can cost 20 to 25,000 dollars to build. But landowners have been taking the city’s offer.


Alan Roberson owns a few acres at the bottom of a sloping corn field. About 42 acres
drains onto his property and then into a creek. He says when he moved there, there was
just a big ditch where stormwater from the neighboring farm fields washed a bigger and
bigger gully, carrying sediment to the creek:


“There was places eight, ten feet deep. We’ve lived here almost 20 years and it just kept
getting deeper as it went along. I hated to even come down here and look at it because it
was getting so bad. So, I’m glad that program came along to take care of it. As you can
see, it’s not doing that anymore.”


Roberson took advantage of the city’s pond program. Where the gully used to be, a carpet
of green lawn now borders a picturesque little pond.


Alan Roberson says the pond has a pipe in the bottom of it, kind of like a bathtub plug. It
was part of the design required to get the matching funds from the city. When the pond
fills up with silt, Roberson will be able to drain it and dig out the soil:


(Sound of water trickling)


“See this valve down here? You can actually pull that up. It could very well be 20 years
from now they’ll get enough silt in here where a person will have to bring it down. But
like I said, it’s designed to do that.”


That silt is some of the richest dirt in the corn belt and could be sold back to farmers or
used for gardens or flower beds. The landowner will have to pay the cost of digging it
out, but it’s that much more silt that won’t have to be dredged from the lakes or the rivers
that feed them, where people get their public water supply.


For the GLRC, this is Lester Graham.

Related Links

Growing Dead Zone Cause for Concern

Scientists say the size of this year’s dead zone in the Gulf of Mexico is bigger than average. It’s grown to more than 65-hundred square miles in size. The GLRC’s Mark Brush explains:

Transcript

Scientists say the size of this year’s dead zone in the Gulf of Mexico is bigger than
average. It’s grown to more than 6,500 square miles in size. The Great Lakes Radio
Consortium’s Mark Brush explains:


Each spring, scientists measure the amount of nitrogen and phosphorus pollution coming
down the Mississippi river. The excess nutrients mostly come from farm fields and
sewage treatment plants in the Mississippi river basin. The nutrients cause algae blooms
in the Gulf of Mexico which eventually rob the water of its oxygen.


Dave Whittall is with the National Oceanic and Atmospheric Administration. He says
the dead zone has a big impact on the region’s ecology and economy:


“That whole area where we don’t have oxygen, nothing can live there, so this is an area
the size of the states of Connecticut and Rhode Island put together where you have no
aquatic life essentially.”


Government officials are working toward a goal of cutting the size of the dead zone by
half in the next nine years. And they’re looking to farmers and cities to help them with
that goal.


For the GLRC, I’m Mark Brush.

Related Links

Ten Threats: Farmland to Wetlands

  • Installing vast networks of underground drains, known as tiles, is a common practice on farms throughout the country. Farmers can get their machines onto the fields sooner, and crops grow better when their roots aren't wet. This field, near Sherwood, OH, was once part of the Old Black Swamp. (Photo by Mark Brush)

One of the Ten Threats is the loss of wetlands. A lot of the wetlands of the Great Lakes were
turned into cropland – farmland. But before farmers could work the fields in the nation’s bread
basket, they first had to drain them. So thousands of miles of ditches and trenches were dug to
move water off the land. Losing millions of acres of wetlands meant losing nature’s water filter
for the lakes. Reporter Mark Brush reports… these days some farmers are restoring those wet
places:

Transcript

We’ve been bringing you stories about Ten Threats to the Great Lakes. On today’s report, the
Great Lakes Radio Consortium’s Lester Graham introduces us to a story about how farmers are
getting involved in restoring some of the natural landscape:


One of the Ten Threats is the loss of wetlands. A lot of the wetlands of the Great Lakes were
turned into cropland – farmland. But before farmers could work the fields in the nation’s bread
basket, they first had to drain them. So thousands of miles of ditches and trenches were dug to
move water off the land. Losing millions of acres of wetlands meant losing nature’s water filter
for the lakes. Reporter Mark Brush reports… these days some farmers are restoring those wet
places:


We’re standing in the middle of a newly-harvested corn field in northwest Ohio. This area used
to be wet. It was part of the old Black Swamp – one of the biggest wetland areas in the country.
The Swamp stretched 120 miles across northwest Ohio and into Indiana. It filtered a lot of water
that eventually made its way into Lake Erie. And it provided habitat for all kinds of wildlife.


Today, the Black Swamp is gone… It was drained and turned into farmland.


“Is it o.k. to go?”


“Yeah, go.”


(sound of trenching machine starting up)


Lynn Davis and his crew are cutting a trench into the earth. The trench is about a half a mile
long and five feet deep. Workers trail behind the machine feeding black, plastic pipe into the
trench.


The underground pipe will drain excess water to a nearby ditch.


Davis says these drains help the farmer grow more crops. It’s a common practice that’s been
going on for more than a hundred years. Farmers can get their machines onto the field sooner,
which makes for a longer growing season. And crops grow better when their roots aren’t wet.


Years ago, wetlands were considered a bad thing – places that stood in the way of farmland
development – and places where diseases spread.


The federal government actually paid people to drain them. And by the end of the 20th century
more than 170,000 square miles of wetlands were drained.


Lynn Davis’s family has been in this business for close to a hundred years. Davis admits that his
family helped drain the Black Swamp. But he says much of what’s been done can be reversed:


“You know, there is no question that this was of course one of the largest natural wetlands in the
country. And what we’re doing here was responsible for eliminating that wetland. Now what
we’ve done is relatively simple to reverse. If for some reason it was decided that we don’t want to
farm and live in this area any more, why we can put it back to a swamp real quick.”


And some of that is happening today.


Instead of paying people to drain wetlands, the federal government pays people to restore them.


(crickets)


We’ve driven about fifty miles north to where Bill Daub lives. He was hired by the U.S. Fish and
Wildlife service to find suitable land for restoration. And he’s restored well over 500 wetland
areas in the fifteen years he’s been doing it.


Daub says nature bounces back. He says every time he’s broken an old drainage pipe, dormant
seeds of wetland plants stored in the soil popped open:


“What’s amazing with the wetlands is that you see all these cattails, and wetland plants growing
in here – that stuff was in a seed bank, even though they were growing corn here, there was a seed
bank of wetlands species, waiting for water.”


The federal government will pay a farmer to take marginal cropland out of production under the
Wetlands Reserve Program. And Daub says it’s worth the money:


“Every one of these wetlands is a purification system. The water that finally leaves this wetland
has been purified through the living organisms in the wetland.”


(natural sound)


Janet Kaufman lives just down the road from Bill Daub, and eight years ago, she had a crew dig
up an old drainage pipe on her farm. These days, on the back end of her property there’s a pond
with a tall willow tree draping over the water:


“So this wasn’t here before?”


“Not at all, not at all! I mean it’s just shocking. And when the backhoe hit that it was like a
geyser, the water just poured out it just flew up in the air. They had to crunch it shut. I mean the
quantity of water that flows underground is unbelievable unless by chance you see it like that.”


Kaufman says a lot of her neighbors have been signing up to restore wetlands on their property.
The wetter areas aren’t that good for crops… and with the government offering money to let
nature take its course… it makes financial sense for the farmers.


But because a lot of the old Black Swamp area is good for farming, it’s not likely that we’ll see
huge swaths returned to wetlands.


But even the restoration of a fraction of the wetlands will help improve the health of the Great
Lakes.


For the GLRC, I’m Mark Brush.

Related Links

Turtle Numbers Down; Trapping Banned

  • Joanna Schmidt, a student at Minnesota State University-Moorhead, is part of a long-term turtle research project. She's trying to find out why turtle populations are declining in the Midwest. For her research, she catches turtles and gives them an identifying mark, then weighs and measures them before putting them back in the water. (Photo by Dan Gunderson.)

Many Great Lakes states are taking steps to protect turtles. There’s a big demand for turtles in Asia and Europe. But too much trapping can damage wild turtle populations. As a result, states are placing bans or restrictions on turtle trapping. The Great Lakes Radio Consortium’s Dan Gunderson reports:

Transcript

Many Great Lakes states are taking steps to protect turtles. There’s a big demand for turtles in
Asia and Europe. But too much trapping can damage wild turtle populations. As a result, states
are placing bans or restrictions on turtle trapping. The Great Lakes Radio Consortium’s
Dan Gunderson reports:


(sound of paddling)


Joanna Schmidt pushes a canoe into a small slough in northern Minnesota. She paddles toward a
floating rectangle of plastic pipe. The simple device is a turtle trap. It’s about four feet long with
net in the bottom and a board attached to the side.


“We put a plank on the side and they crawl up to sun themselves and they
just fall in. It’s pretty simple. No mechanics to it. They do all the work for us.”


Joanna Schmidt is a student at Minnesota State University Moorhead. She’s
part of a long-term turtle research project. Researchers want to learn
more about turtle habitat, and why there’s been a recent decline in turtle
populations.


This slough is about a quarter mile across. It lies in a hollow surrounded
by farm fields. Chest high grass and reeds line the water’s edge. Along one end, dead,
sunbleached trees stick out of the water. It’s perfect turtle habitat.


“It’s warm, a lot of food for them, not very many predators, so they like it,
especially having the dead trees with a place to hang out and sun themselves. So this is
very typical.”


Gunderson: “Any estimate of how many turtles might live in a slough this size?”


“Not just yet. That’s what we’re hoping to get to. And that’s what the DNR would
like to know.”


There are several turtles in the trap. Most have been caught before.
They’re identified by small notches in their shells. Schmidt weighs and measures
each turtle before gently setting them back in the water.


Minnesota State University Moorhead Biology professor Donna Stockrahm is
directing this research project. She says it takes years of research to get meaningful data about
turtles. They grow very slowly and they live a long time.


Stockrahm is hoping to learn about rates of turtle mortality, growth rates,
and the optimum habitat for turtles.


She’s seen a puzzling decline in turtle numbers.


“We started this in 2001 and they marked over 250 turtles. Then in 2002
the number just dropped drastically. And there seemed to be fewer turtles
around, even turtles that you see out sunning themselves on rocks and limbs and
dead tree trunks and things like that.”


Stockrahm says she doesn’t have an explanation for the decline. She’s
waiting to see if the trend continues this year.


Turtles are in demand in Europe for pets, and in Asia for
traditional medicines. More than seven million turtles are
exported from the United States each year.


Minnesota Department of Natural Resources researcher Rich Baker says
trapping is one reason turtle populations are down.


“What we’ve learned relatively recently is that especially in northern
latitudes commercial harvest really isn’t sustainable. These populations
of slowly maturing species just can’t sustain harvest of adults from the
population.”


Rich Baker says demand for turtles is driven largely by Asian and European
markets. Baker says many Asian turtle species are endangered because of
overharvest.


Those markets are turning to North America which is a particularly turtle-rich
part of the world and the upper Midwest which is a particularly
turtle-rich part of North America. Many of the states in the upper Midwest
have actually closed commercial turtle harvest completely.”


Most Great Lakes states now ban or restrict turtle trapping. Rich Baker
says Minnesota decided to phase out commercial harvest. He says about a dozen
people make a living trapping turtles. They’ll be allowed to continue.


People who like to eat turtle can still get a license to trap for personal
use. But there will be no new commercial turtle trapping licenses.
Minnesota will allow turtle farms as an alternative to harvesting wild turtles.


For the Great Lakes Radio Consortium, I’m Dan Gunderson in Moorhead, Minnesota.

Farming With Computers

You probably have a computer in your car, on your desk and maybe even in your stove. It seems like there are computers everywhere these days helping with everything from our checking accounts to our turkey roasts. Now researchers want to install computers in another place, where most of us would least expect it – in Old MacDonald’s tractor. The Great Lakes Radio Consortium’s Daniel Grossman has this story: