Soil Fertility
Contact John Sawyer(515) 294-1923 |
Early season potassium deficiency symptom (K deficient soil) - soybean. Photo © John E. Sawyer | |
Soil Fertility, John Sawyer, Department of Agronomy, 2104 Agronomy Hall, Iowa State University, Ames, IA 50011
Phone: (515) 294-1923,
Fax: (515) 294-9985, Email: jsawyer@iastate.edu
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