Relationship between root characteristics of peanut in hydroponics and pot studies
A large root system can be an important character for drought tolerance. Measuring root characteristics in soil medium is tedious, time consuming, and labor intensive. The objective of this study was to determine the association between root characteristics of peanut (Arachis hypogaea L.) grown in hydroponics and in pot experiments. Twelve peanut genotypes were planted in a randomized complete block design with four replications in a hydroponics study, a small pot, and a large pot experiment. The studies were conducted in two years during 2004–2005. Shoot dry weight, root dry weight, root-to-shoot ratio, root length, root surface, average diameter of roots, and root volume were measured. Tifton-8 and ‘KK 60-3’ had consistently higher values for all root characteristics compared to the other genotypes. Root characteristics of peanut genotypes grown in hydroponics were positively correlated with those of peanut genotypes grown in pot conditions. The results suggested that assessment of root characteristics of peanut in hydroponics for possible drought tolerance could replace the assessment in soil medium conditions.