Abstract
Iron deficiency chlorosis is a serious problem when many of a number of woody and herbaceous ornamental and fruit plants are grown on calcareous soils. Soil amendments, such as the various iron chelates, have been used with varying success (1,2,3,4), however, except for foliar application on citrus, chelates have found limited use because of their high cost and erratic or less than satisfactory results. The simple inheritance of chlorosis resistance in soybeans is well known (5), however, the few attempts to select chlorosis resistant fruit trees have been rather unsuccessful (6,7). Trees frequently will show no signs of chlorosis until the rcot system penetrates highly calcareous subsoil layers. Thus attempts to select for chlorosis resistance have given erratic year to year results and have, in general, been unsuccessful even after several years of testing.