Volta

Optimal design for on-farm strip trials—systematic or randomised?

Randomised designs are often preferred over systematic designs by agronomists and biometricians. For on-farm trials, however, the choice may depend on the objective of the experiment. If the purpose is to create a prescription map of a continuous input for each plot in a grid covering a large strip trial, a systematic design may be a better choice, although it often attracts less discussion and attention. This study aims to evaluate the performance of systematic designs with geographically weighted regression (GWR) models in addressing spatial variation and estimating continuous treatment effects in large strip trials through numeric simulations. A hierarchical model with spatially correlated random parameters is utilised to generate simulated data for various scenarios of large strip on-farm trials. …

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