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Better Crops with Plant Food
Issues from 1953 to present. Reports news from research related to potash, phosphate, and other nutrient management.
Iowa State University Corn Growth and Development
"Corn Growth and Development is an updated and expanded publication and includes whole plant photography, detailed descriptions of vegetative and reproductive development, and dry matter and nutrient accumulation figures."
Penn State Agronomy Guide
Two part publication including crop and soil management and pest management from Penn State's Dept. of Agricultural Sciences. Purchase may be required.
University of Illinois Agronomy Handbook
An online guidebook published by the University of Illinois Extension. Each chapter provides guidance on different aspects of crop cultivation.