they found the weather and local geology had combined this organic mulch with sand and silt to form a nutrient-rich type of soil called loam. It gave Iowa one of the most fertile soils on the ...

Rich, fertile soil supports robust plant growth, enhances nutrient uptake ... and depth of tillage can help preserve soil ...

Highly fertile and rich in organic matter ... They consist mainly of plant residues, similar to compost, and are formed in peatlands, where the soil is gorged with water. High water content ...