An Electronic Probe For Estimating Ear Moisture Content of Maize1

A need exists for a reliable and non‐destructive method for identifying genotypes with rapid dry‐down rates in segregating populations of maize (Zea mays L.). We designed an electronic probe for this purpose and report the results of its use. Correlation coefficients between the moisture content estimated with the electronic probe and the percent ear moisture obtained by the conventional oven method were r = 0.90 in 1975 and r = 0.91 in 1976 (r = significant at 1% level). We concluded that the electronic probe method would be useful to maize breeders in identifying genotypes with rapid dry‐down capabilities and could be used by farmers in determining the optimum harvest date.