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Abstract
The role of mineral nutrition in the development of internal breakdown of plums was evaluated by applying various statistical models to data obtained in a field survey. All techniques contributed towards elucidation of the role of nutrition in the occurrence of the disorder. However, multivariate statistical algorithms proved to be more efficient in this study and allowed rapid selection and quantification of factors related to the incidence of the disorder. In general the same nutritional factors which are involved in other fruit disorders, viz. N, P, K, Ca, and Mg were important. Tree vigour also had an important effect. Norms for nutrient levels in fruit and leaves to limit the incidence of internal breakdown are suggested.