EFFECT OF NITROGEN, PHOSPHORUS AND POTASSIUM FERTILIZATION ON THE CONTENT OF MACROELEMENTS IN FRUITS OF AUBERGINE (SOLANUM MELONGENA L.) GROWN ON ORGANIC SUBSTRATES

A plant growing experiment was conducted in 2003-2004 on the aubergine cultivars Epic F1 and Solara F1 grown in an unheated polyethylene tunnel greenhouse at the Expe-rimental Station in Marcelin, the University of Life Sciences in Poznañ. The seedlings were planted on 15 May on beds at a 0.5×0.5 m spacing, i.e. 4 plants m–2, in 6 dm3 cylinders filled with substrate limed to pHH2O = 6.5, which consisted of: 1) highmoor peat from Lithuania, 2) pine bark from the pulp plant Zakady Celulozowe + fen peat from Biskupice near Poznañ (v: v = 1: 1). The basic fertilization, i.e. pre-vegetation fertilization and top dressing with macronutrients, based on an analysis of the substrate was applied, using the universal method in 0.03 M CH3COOH. The fertilization was designed to achieve the follo