Dumping on manure, chemical fertilizer
![]()
Which is worse for the nation's environment - animal manure or chemical fertilizer?
According to a story today in the Washington Post, the waste generated by farms raising cattle, hogs, chickens and turkeys is getting into the water (and air) in increasing quantities, even as environmental laws are cracking down on other pollutants.
Farm animal manure (like the chicken manure being cleaned out of an Eastern Shore poultry house in the above photo) is responsible for roughly a quarter of the nitrogen helping to create a massive dead zone in the heart of the Chesapeake Bay, David Farenthold points out. It's also a factor in more than 200 other coastal dead zones around the country. Modern industrial-scale animal farming simply generates too much manure to safely spread on crop fields - the excess washes off into nearby water ways.
But fertilizing farm fields with chemical or synthetic nitrogen (aka "artificial manure") doesn't seem any better for the environment, according to an ongoing series in Grist, the Seattle-based online publication of green news and commentary. The latest installment, which you can read here, reports on research finding that synthetic nitrogen winds up damaging the soil and destroying its ability to absorb climate-warming carbon dioxide.
What's a farmer to do? Correction, what are we all to do, since we're the ultimate consumers of those crops the farmers raise? Is there more that can and should be done to control fertilizer use to protect our streams, rivers and bays? Can we cut back on fertilizer use without harming food production? Food for thought.
(2008 Baltimore Sun file photo by Doug Kapustin)
Categories: Chesapeake Bay, Climate change, Food, News



Comments
Can a farm be certified organic even if they fertilize with manure?
Posted by: Eve Redman | March 1, 2010 4:08 PM
Tim, there is only one suitable answer to your question about what to do. Since consumers drive the production of chicken waste (about 1 million tons per year on Delmarva alone), then the consumers who honestly want to help the Bay should reduce their chicken consumption by at least 50% in the next year, and replace much of that with plant proteins, such as beans, nuts and healthier soy foods like tofu.
That's not to suggest that plant food crops are pollution-free, but they are much less polluting than any chicken farm.
Posted by: Mark | March 2, 2010 1:41 PM
Tim, thanks for including all of us in the realm of who is responsible here!
I disagree that consuming 1/2 as much chicken is a solution to the Bay's woes.
First, the amount of poultry manure spread on fields and the manner in which that's done have both improved a lot in the past few years, and I can't understand how this accounts for a major increase in nutrients over the short term.
Second, locally-produced poultry actually doesn't have a higher carbon footprint than tofu, produced overseas and imported at considerable energetic cost.
I suggest we look at farm fertilizer in the form of sewage sludge and how much nutrient pollution that is generating today. The most significant thing that has increased over that time span is the number of people in the Bay watershed, and they are all producing nutrient waste at the same rate per person, pretty much regardless of diet.
Posted by: Judith | March 2, 2010 3:25 PM
Judith,
Increased watershed population (a big part of the problem) necessarily implies more food consumption. Assuming that most fresh chicken sold at grocery stores and such is not shipped from Arkansas, Texas or California, chances are it was produced in the region, and most of the region is in the Bay watershed. So, how does more people not equal more chicken manure, and how can that not equal more Bay pollution?
Under any circumstance, 1 million tons of manure produced every single year on Delmarva cannot be spread prudently on available land. It must be either be over-applied, burned, used in cattle feed, or shipped out for other uses. Let's ask Eastern Shore residents if they have a shortage of chicken manure, but I doubt they'd be able to stop laughing at such a ridiculous question. If they don't have a shortage, that means they have an excess. Excess manure must be disposed of in some way. Can we bring a few hundred tons to your yard?
"Improved" does not mean suitable, appropriate, or in compliance with all applicable laws and regulations. The state and feds acknowledge that chicken manure is a problem and most producers are not in compliance.
I don't know why you believe all American tofu is made overseas, but most of it is made in the US.
For more information, check out the United Nations report "Livestock's Long Shadow" published in 2006.
Posted by: Mark | March 2, 2010 10:38 PM
I have to agree with Mark's comment here. There is plenty we can do, but generally speaking, it is far less appealing to the mass public than just continuing not to question how the food on their plate gets there and to not take responsibility for it.
A change in eating habits is needed, which in turn requires an almost cultural change, and that won't be easy. Plants based foods are not completely guilt free when it comes to impact on the environment, but it's considerably less damaging than this scale of livestock farming.
Farmers are just using the cheapest and most efficient way to fertilise the soil, the government needs to bring in better incentives to use alternatives and/or offset the current damage they are doing.
But ultimately it requires getting the average person to take responsibility for the environment they live in, in a way that is appealing to them. How you get the average disconnected person to reconnect with the environment is beyond me.
Posted by: Amber Green | November 22, 2010 7:17 AM