Mineral nutrition of plum trees as an important factor of protection against plum pox virus disease.

The experimental results obtained from a fruit garden at Krajné pointed out a different content of macrobiogenic elements in the leaves of plum trees infected with plum pox virus (PPV) as compared to healthy ones. Mineral nutrition of diseased trees was characteristic by lower relational values of topical levels of macrobiogenic elements especially those of N/P, N/K, (Ca + Mg)/K, and (N/P)/(N/K).