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Estimation of Optimum Field Plot Shape and Size for Testing Yield in Crambe abyssinica Hochst.¹

A uniformity test using ‘Prophet’ crambe(Crambea abyssinica Hochst.) in a "solid seeding" of 1,296 basic units (one basic unit equaled 1.47 m²) was conducted to determine an appropriate plot shape and size for use in crambe yield testing.

In analyses using Smith's regression procedure, the soil heterogeneity index, b, was calculated as 0.5361 and the optimum plot size was estimated to be 6.70 m².

Results of analyses using the modified maximum curvature technique developed by Lessman and Atkins (1963) indicated a plot size of 5.35 m² as optimum.

Plot shape had an effect on plot-to-plot variability. Long, narrow plots arranged with their greatest length in the direction of greatest variation resulted in a lower estimate of among plot variance.

Key Words: Uniformity trial • Soil heterogeneity • Coefficient of variability

² Graduate Research Assistant and Professor of Agronony, Department of Agronomy, Purdue University, Lafayette, Ind. 47907.

Received for publication February 17, 1971.