Evaluation location: Ohio, United States
Mineral soil adaptation indices:
A mineral soil adaptation index (0 – 10) for each genotype was calculated as follows: mineral soil adaptation score = Ʃ mean ratings for vegetative vigor (1995 and 1996), yield balance (1995 and 1996) and nutrient deficiency symptoms (1996) divided by 5. This index was used in conjunction with growth and fruiting data to evaluate genotypic response to the mineral soil environment. The mineral soil adaptation indices varied continuously within the population ranging from 2.8 to 8.9. Individuals displaying indices > or = 7.5 exhibited mineral soil adaptation.