Americas FarmlandCredit: Public Domain
It sure is a beautiful sight isn't it the amber waves of grain blowing in the wind with the rugged farmer in his tractor ready to harvest. It is a sight that most of us in the western world are not familiar with, for we have lost touch with where the food on our table comes from.
For many years America has been a powerhouse of agriculture production, a trend that continues to this day. But this trend may be coming to a end due to our overuse and destruction of America's prime agriculture lands. There are 3 factors that are the driving force behind the loss of agriculture land in this country.
- Soil Erosion
- Urban Sprawl
- Soil Pollution
Loss to Erosion
Soil erosion is the enemy of anyone that works with soil in any way. You have roads that will erode away from rain, bridges that lose their foundations to rivers and finally farmers that watch their prime soils blow and wash away from exposure to the wind and rain.
Just a few facts about soil erosion to help you understand,
Soil Erosion Around the World
- Currently around 80% of the worlds cropland suffers moderate to severe erosion.
- The loss of soil worldwide is about 30 tons/hectare/year.
- Around 30% of the worlds productive farmland has been abandoned in the past 40 years because of erosion.
Soil Erosion Here in America
- Average erosion rates in the US are 10-15 tons/hectare/year.
- Soil forms at a rate of .5-1 ton/hectare/year.
- Around half the topsoil of Iowa has been lost in the last 150 years.
Soil erosion is a serious problem that is literally taking the ground from beneath our feet. With increasing population and the associated food demands, we are forced to push our existing farms to their limits and expand into marginal land that is even more prone to erosion. The erosion rates on our farms can be directly tied into the farming practices that are used. Techniques like heavy cultivation, plowing under crop residue and total removal of organic material from fields is detrimental to soil health and structure. Without good soil structure and protection from crop residues the soil is broken down into small particles that can be easily eroded by wind and water.Credit: Public Domain
Loss to Urban Sprawl
Urban sprawl is the result of the American dream and was created by Americans love affair with the automobile and the desire for everyone to have the idyllic country life. What we got for our dream was a disturbing mix of cookie cutter houses, postage stamp lawns and the backdrop for the beginning of every zombie movie not starting in a hospital.
Urban sprawl is something that has only been increasing in size as people begin to look for their share of the American dream. For example in 1950 our nations urban ares covered 13,000 square miles by 1990 the population doubled but the land use grew by 400% to almost 60,000 square miles. So essentially people moved into the suburbs and they demanded that 2 car garage, half acre lot and Fido in the backyard. That demand for larger lots swallowed up prime farmland at a astounding rate. In between 1982 and 1997, 25 million acres was swallowed up by strip malls, roads and subdivisions. 
Cities were built where they were for two reasons historically, good soil and good water. But with our cities continually expanding outward, by default they are gobbling up the best farmland in the area. It's ironic that we destroy what we are looking for in the country lifestyle, when we build that idyllic 4 bedroom home in the suburbs of cities.
Loss to Pollution
Credit: Dumelow Wikipedia CommonsSoil pollution is a growing concern among those that work the soil for a living. Soil can polluted or contaminated in a variety of ways. Industrial activity has been the biggest contributor through the mining and drilling industries. Mining leaves a lot of unused residue behind in its wake like coal ash, sludge, toxic chemicals, and heavy metals. All of this material gets incorporated into the soil where it can be absorbed by plants which in turn can affect the health or even kill animals and people that eat the contaminated plants.
There are over 1300 Superfund sites in the US that are managed as priority for clean up due to toxic waste and those are just the ones that call for the attention of the EPA. We also have to consider the local landfills, decrepit industrial ares, and other remnants of the factory era of the 19th and 20th centuries. They left a huge Rust Belt across the upper Midwest that has soil that has been heavily contaminated by the industrial manufacturing that took place there.
We are losing soil at a astounding rate in a era where we need every productive acre we can. There is a lot that can be done on both a local and worldwide scale to address these problems. The main solution is education about the problem as most people are unaware a problem exists. Hopefully if more people become aware of the problem, then we can slow or stop the damage that is happening to our nations precious soil resource.