The nitrogen content of corn grain as affected by hybrid, population, and location

Samples were taken from 9 of the 20 major experiments which comprised the Illinois commercial corn (Zea mays L.) performance trial and evaluated for grain yield, percent grain N, and grain N yield. The mean percent N in the grain was 1.54%, with 91.8% of the samples between 1.34 to 1.74%. Although location and plant population affected the mean values, the range of values about the mean was relatively unaffected. Grain N yield was more closely correlated with grain yield than with percent grain N.