Fig. 1.

Yield maps of the five crops (from Richter and Kroschewski, 2009).

 


Fig. 2.

Covariograms of the 2- by 2-m plots for the five crops.

 


Fig. 3.

Bias of the standard error of difference (SED) and empirical Type I errors of the t-test and F test for a nominal error of 5% for the 1954 hemp, beet, and 1958 hemp crops using Designs 4, 9, 12, and 13 and all analyzed models: B, basic; r, random walk; P and p, power; S and s, spherical; G and g, Gaussian; A, anisotropic power model; b* indicates the best model.

 


Fig. 4.

Bias of the standard error of difference (SED) and empirical Type I errors of the t-test and F test for a nominal error of 5% for the rye and oat crops using Designs 4, 9, 12, and 13 and all analyzed models: : B, basic; r, random walk; P and p, power; S and s, spherical; G and g, Gaussian; A, anisotropic power model; b* indicates the best model.