“Delate’s study found that soils in the organic plots (three- and four-year rotations of corn, soybean, oats and alfalfa) had significantly higher quality compared to the plots using a conventional two-year rotation of corn and soybeans. The organic plots had up to 40 percent more biologically-active soil organic matter, which is important for fertility and nutrient availability. Organic soils also had lower acidity and higher amounts of carbon, nitrogen, potassium, phosphorous and calcium. ”

You can read the rest of the article here…

http://www.leopold.iastate.edu/news/05-23-2013/soil-building-benefits-organic-practices