Soil fertility is a key factor in determining agricultural potential. Soil texture varies with particle size, from clay (fine) through silt (medium) to sand (coarse). Loam is best for plant growth.

Tunisia: Cracked clay soil may be the result of erosion or drought
FAO photo by F. Botts

More photos in series:
  • Peru: Women farmers applying fertilizer to a field of freshly sown potato seeds
  • Viet Nam: Smallholder farmers preparing sandy soil for planting trees
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