ISHS Acta Horticulturae 396: Hydroponics and Transplant Production
INPUT VERSUS OUTPUT OF NITROGEN AND POTASSIUM IN CLOSED CIRCULATING SYSTEMS |
| Authors: | F.-G. Schröder, D. Schwarz, R. Kuchenbuch |
| Keywords: | Lycopersicon lycopersicum, Nitrogen uptake, Nutrient balances, Nutrient Film Technique, Hydroponic culture, Potassium uptake |
| Abstract:
At present the majority of hydroponic systems is operated with at least occasionally open nutrient supply. This causes release of nutrients that may become pollutants. Closed nutrients supply systems may be adequate to avoid problems associated with these losses. For potassium and nitrogen balance input and output of closed nutrient systems were compared for tomato (Lycopersicon lycopersicum cv. Suso) grown in the greenhouse from April to October 1993. Two recirculated hydroponic systems, Nutrient Film Technique (NFT) and Plant Plane Hydroponics (PPH) were used. No differences existed between the growing systems. Uptake of tomato was 456 kg·ha-1 and 302 kg·ha-1 for potassium and nitrogen, respectively. Input of nutrients balanced output, e.g. no nutrient losses were observed. | |
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