Effect of soil oxygen deficit on iron nutrition of orange seedlings

Abstract
A virgin sandy loam, pH 6.2 was used with and without added CaCC3 in 3-gal. jars to grow orange seedlings in a greenhouse. Fe absorption by plants was reduced by the added CaCO3 (0.5-3.0%) or by O2 deficit (3.5% in soil). Neither treatment alone caused chlorosis but the combined effects were additive and induced chlorosis. Fe concentration in leaves was closely correlated with root: top ratio. It is suggested that the level of Fe nutrition is dependent on the extent of root development.