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Yield Adjustment for Missing Units in Spring Wheat¹

Plot rows of spring wheat (Triticum aestivum L.) having missing areas were studied to determine if an appropriate correction factor could be determined to adjust plot yields. Areas ranging from 0 to 240 cm (0 to 8 missing units or 50% of the area) were removed in one or two plot rows harvested subsequently for yield. Different genotypes, with diverse agronomic characteristics, were included in different years.

Generally, no significant decrease in yield of the genotypes was detected until more than 60 cm (12.5%) of plot area was removed. Regression analyses were performed each year and indicated that the average slope (b) based on percent reduction in yield per missing unit (30 cm) was about 4.55%. The b values ranged from 3.7 to 5.0% reduction in yield per missing unit across genotypes and years. Satisfactory adjustments of yield, based on the average percent reduction (4.55%), were obtained if yield adjustment was ignored until more than 2 missing units (60 cm) occurred.

Key Words: Compensatory effects

² Associate Professor of Agronomy and Rockefeller Foundation Fellow, respectively, North Dakota State University, Fargo, N.D. 58102. The junior author's address is Wheat Research and Training Center, P. K. 226, Ankara, Turkey.

Received for publication July 1, 1972.