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anney_gw

Be cautious about fertilizer over-use

anney
14 years ago

Do your part to keep the environment healthy! When I lived in a coastal area of NC, the State finally had to make it unlawful to fertilize farmlands within a certain distance of rivers and sounds to prevent runoff and "red tides". But much of the pollution came from upriver from the towns and cities that dumped their sewage in the rivers and had no farm runoff controls at all. Stormwater runoff from hurricanes was also a terrible problem, much more difficult to control. They're still working on finding funding to regulate and enforce the regulations that have already been developed. And this doesn't even address toxic chemical pollution from manufacturing operations that also gets dumped untreated into rivers.
Massive Imbalances Found In Global Fertilizer Use, Resulting In Malnourishment In Some Areas And Serious Pollution Problems In Others

In the Midwestern United States, over-fertilization was the norm from the 1970s until the mid-1990s. During that period, tons of excess nitrogen and phosphorus entered the Mississippi River Basin and drained into the Gulf of Mexico, where the large influx of nutrients has triggered huge algal blooms. The decaying algae use up vast quantities of dissolved oxygen, producing a seasonal low-oxygen dead zone in the Gulf that in some years is bigger than the state of Connecticut.

Since 1995, the imbalance of nutrients--particularly phosphorus--has decreased in the Midwestern United States, in part because better farming techniques have increased yields. Statistics show that from 2003 to 2005, annual corn yields in parts of the Midwestern United States and north China were almost the same, even though Chinese farmers used six times more nitrogen fertilizer than their American counterparts and generated nearly 23 times the amount of excess nitrogen.

"U.S. farmers are managing fertilizer more efficiently now," said co-author Rosamond Naylor, director of Stanford's Program on Food Security and the Environment. However, environmental problems have not disappeared. "The dead zone in the Gulf of Mexico persists due to continued fertilizer runoff and animal waste from increased livestock production," said Naylor, a professor of environmental Earth system science and senior fellow at Stanford's Woods Institute and Freeman Spogli Institute for International Studies.

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