One of his most popular writings was a set of advice for farmers, which lays out more than 10 ... soil to naturally replenish itself, according to a 2006 study from Cornell University, so this ...

and the proportion of air and water all combine to create hundreds of different types of soil. These range from loose sandy soils to waterlogged peats to the beautifully balanced loam that is so ...

When European-American settlers first began ploughing in Iowa, they found the weather and local geology had combined this organic mulch with sand and silt to form a nutrient-rich type of soil ...