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 more P per ton of dry matter in grain than vegetative parts, but for K the opposite occurs, with almost three times more K per ton of dry matter than in the vegetative parts.
Iowa State University
Sawyer, John and Mallarino, Antonio, "Phosphorus and Potassium in Silage Harvest of Drought-Damaged Corn" (2017). Integrated Crop Management News. 2437.
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