Nutrient Topics
Questions? Contact John Sawyer Professor Antonio Mallarino Professor,
Soil Fertility |
Soil Fertility Home PageWelcome to the Iowa State University Agronomy Extension Soil Fertility Home Page. Nutrient topics are listed on the left side. Simply click on a topic of interest and you can find information about that topic, including Extension publications, newsletter articles, conference proceedings and reports, presentations, and links to other related sites. Links also provide access to soil fertility decision aid tools, a photo gallery, and the ISU Soil and Plant Analysis Laboratory. Current TopicPHOSPHORUS AND POTASSIUM IN SILAGE HARVEST OF DROUGHT-DAMAGED CORNJohn Sawyer and Antonio P. Mallarino, Professors, Department of Agronomy, Iowa State University The dry conditions in some areas of Iowa this summer are resulting in quite variable corn growth and production potential. Some livestock producers are considering harvest of corn damaged by drought conditions for silage. Corn silage harvest results in more phosphorus (P) and potassium (K) removal than grain alone because almost the entire plant is harvested. The increased amount removed with silage differs for P and K because the relative amount of P and K is different in corn vegetative parts than in grain. For P there can be approximately four times greater amount of P per ton of dry matter in grain than vegetative parts, but for K the opposite occurs, on average with almost three times greater amount of K per ton of dry matter in the vegetative parts. Read on.
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Iron chlorosis symptom - soybean. Photo © John E. Sawyer |
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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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