| The intention of this research project, which was supported within the "Bundesprogramm Ökologischer Landbau", was to investigate in 2003 the situation on organic apple farms of nutrition of leaves and fruits of the variety 'Topaz' and 'Elstar'. The contents of N, P, K, Ca and Mg were determined in the leaves in April, June and August, micronutrients like Fe, Mn, Zn, B and Cu in April and August. The number of flower-clusters per tree, the fruit-setting and the yield were investigated. There were great differences between the orchards, the yield per tree varied between 3 and 24 kg, depending from the age and height of the trees. Field trials were done to proof the effect of the foliar fertilizers Vinasse, Biokal, Phytoamin, Wuxal Ascofol and Humulus.... |
