Soil degradation: Overlooked in the global food crisis: a problem with dirt
As seeds get better, much of the world's soil is getting worse and people are going hungry. Scientists say if they can get the world out of the economically triggered global food crisis, better dirt will be at the root of the solution.
Soils around the world are deteriorating with about one-fifth of the world's cropland considered degraded in some manner. The poor quality has cut production by about one-sixth, according to a World Resources Institute study. Some scientists consider it a slow-motion disaster.
In sub-Saharan Africa, nearly 1 million square miles of cropland have shown a "consistent significant decline," according to a March 2008 report by a worldwide consortium of agricultural institutions.
The cause of the current global food crisis is mostly based on market forces, speculation and hoarding, experts say. But beyond the economics lie droughts and floods, plant diseases and pests, and all too often, poor soil.
A generation ago, through better types of plants, Earth's food production exploded in what was then called the "green revolution." Some people thought the problem of feeding the world was solved and moved on. However, developing these new "magic seeds" was the easy part. The crucial element, fertile soil, was missing.
Herren is co-chairman of the International Assessment of Agricultural Knowledge, Science and Technology for Development, a collection of scientists sponsored by the United Nations and World Bank. It produced a 2,500-page report last month that, among other recommendations, emphasized a need to improve the world's soil.
Genetic improvements in corn make it possible to grow up to 9,000 pounds of corn per acre in Africa. But millions of poor African farmers only get about 500 pounds an acre "because over the years, their soils have become very infertile and they can't afford to purchase fertilizers," said Roger Leakey, a co-author of the international report and professor at James Cooke University in Australia.
Soil and water issues "have been taken for granted," said Ohio State University soil scientist Rattan Lal. "It is a problem that is not going to be solved. It's going to get worse before it gets better."
In Africa, farmers are forced to use practices that rob nutrients from the soil, not put it back, said Herren, who heads an Arlington, Va., nonprofit. Fertilizer is a quick, short-term fix, but even that isn't being done, he said.
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