Why Farmers Are Flocking to Manure
December 5th, 2010I’d be extremely careful with manure from industrial livestock operations in the U.S. Most or all of what those animals eat is genetically engineered and they are pumped full of antibiotics and injections containing heavy metals.
Animal manures can be wonderful fertilizers that build soil structure and increase beneficial biological activity in the soil. Just try to get your manure from as small of an operation as possible, preferably your own animals. And don’t forget humanure.
Via: The Atlantic:
I half-jokingly suggested about a year ago that animal manure—used livestock, horse, and chicken bedding—was going to be the hottest commodity on the Chicago Board of Trade one of these days. Shortly after that I got a call from a close acquaintance who manages an awesome business of growing 8,000 acres of corn and soybeans—which he knows I consider insane. He wanted to tell me something I never expected to hear from him: He was thinking of going into the feedlot beef business. I reminded him that this is rarely profitable in Ohio except as a tax shelter, but he said he didn’t care if it only broke even. It was the manure that he was after, for fertilizer. And he had not read what I had been writing in that regard. Holy shit. I almost dropped the phone. Most of the farmers in my neck of the cornfields agree with what one of them told me over a martini one day: “The only shit that is going to drop on this farm is mine and my wife’s.” He much preferred fertilizing with anhydrous ammonia (one whiff of which could kill him and his wife).
My 8,000-acre friend is no fool, believe me. There are indications now that such a seemingly absurd prediction about manure might not be so absurd after all. Even the agricultural colleges (almost always among the last to recognize either agricultural or cultural shifts) are scheduling what Ohio State University calls Manure Science Review days. The main reason that manure is suddenly seen as a science is that chemical fertilizer prices are on the rise. Yes, they rise and fall with every paranoid scuttlebutt of the marketplace, but the general direction is definitely north. The price of a specialty fertilizer like ammonium polyphosphate is nearly $1,000 a ton as I write. Deposits of potash in Canada, which we have long relied on for potassium fertilizer, are dwindling, and there is no other known supply as readily available. There is much talk of opening a huge phosphorus mining operation in the South American rain forest, which will hardly be hailed with joy by environmentalists. Natural gas, the major source of commercial nitrogen fertilizer, is rising in cost as other users compete for it. In fact, there are reasons to believe that the era of reliance on manufactured and mined fertilizers is passing. A society so utterly urban-ized as ours may not want to face up to what that means, but the end of cheap chemical fertilizer would be almost as earth-shaking as a nuclear bomb.
If we run out of cheap sources of commercial fertilizer, there will be no way to avoid a precipitous decline in crop yields, no matter how rapidly farmers try to switch to organic methods. And as they switch, the demand for organic fertilizers will also rise precipitously. It has taken us about 100 years to reduce soil organic matter to dangerously low levels—from about 5 percent, on average, to below 2 percent—and experts say it might take at least that long to build them back up again using organic methods on a large scale. Getting all the manure and other organic wastes needed to maintain yields high enough to support rising populations without a full complement of commercial fertilizers would be an enormous challenge requiring new agricultural and cultural attitudes.
A friend of my mother manages a fungi-growing business. She’s very interested in fungi’s potential as a source of pharmaceuticals and antibiotics. Some fungi happily absorb metals. It may be that with their help even feedlot-sourced manure could be cleaned up to some extent