Hodges, Steven. 2010. Soil Fertility Basics: NC Certified Crop Advisor Training. North Carolina State University Soil Science Extension. Accessed at: < http://www.soil.ncsu.edu/programs/nmp/Nutrient%20Management%20for%20CCA.pdf>
Chapter one of the Soil Fertility Basics: NC Certified Crop Advisor Training publication by Steven C. Hodges, professor at Virginia Tech University, discusses foundational soil science concepts. These concepts include soil composition, soil solution, the nitrogen cycle, the phosphorus cycle, micronutrients, fertilizer sources, and other concepts related to soil physiology.