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Expected Yields and Returns for Corn Due to Nitrogen and Plant Population¹

Expected corn (Zea mays L.) yields, net returns, and variances have been calculated from predicted yield data based on regression analysis of nitrogen and population experiments for 7- and 8-year periods in Missouri. Data from non-irrigated and irrigated experiments are used for comparative purposes. The pattern of expected yields and returns was similar for the two sets of data although maximum yields and returns for the irrigated plots were greater and were obtained at greater input levels for both nitrogen and population. However, variance patterns, which result from different levels of nitrogen use, were quite disimilar. Variance generally increased with larger N inputs for the non-irrigated experiment but decreased for the irrigated site. Variances tended to reach a maximum (non-irrigated) or minimum (irrigated) at about the peak of expected yields.

Key Words: Zea mays L. • Fertilization • Yield variances • corn production efficiency

² Associate Professor of Agricultural Economics and Assistant Professor of Soils, University of Missouri, Columbia, Mo. 65201.

Received for publication October 22, 1969.