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Leaf analysis is a conventional system, which is commonly used to judge the nutritional status of perennial cultures. All plant parameters which may change the mineral composition of the tested plant part should be known in order to develop a correct rating matrix for fertilization recommendations. Perennials like grapevines have specifics which are unknown in annuals and which may have an influence on nutrient composition: rootstock, varieties, pruning and trellising systems and finally also clones selected out of varieties. Most of the varying factors are evaluated but no information exists about clonal material. In a field trial (7x7 lattice with 6 replicates) 5 of the most important 'Riesling’ clones in Germany were planted and leaf composition was tested at three stages. The macro-nutrients N, Mg, and Ca were not influenced by the clone, whereas P and K showed a significant dependency from clonal material. The micro-nutrient showed with exception of Mn no influence of clones. Sampling time is significant for all nutrients except Mg and Cu. There exist no interaction clone x sampling date. For the practice of leaf analysis it is important that the influence of clonal material is of minor importance. For phosphorus and potassium, both show a clonal dependency, a correction factor may be developed and used for the final judging of results.

INFLUENCE OF DIFFERENT CLONAL MATERIAL OF THE VARIETY RIESLING (Vitis Vinifera L.) ON THE MINERAL COMPOSITION OF LEAVES