ISHS Acta Horticulturae 150: International Symposium on Substrates in Horticulture other than Soils In Situ
INFLUENCE OF CACO3 ADDED TO THE SUBSTRATE ON THE NITROGEN NUTRITION OF PELARGONIUM HORTORUM MOTHER PLANTS |
| Authors: | F. LEMAIRE, A. DARTIGUES |
| Abstract:
With the conditions of growing on artificial substrates, the nitrogen nutrition of the Pelargonium hortorum mother plants can be obtained by nutrient solutions including either nitric or ammonium form ; in the latter case, the non organic and organic plant contents are changed and symptoms of toxicity can occur. Former works of GOUNY (1955) have shown that the presence of CaCO3 in the nutrient medium was a factor of reducing the ammonium toxicity in annual plant cultures. In this paper, the authors study the influence of increasing rates of CaCO3 (0 to 12 kg/m3) added to a substrate (sand + sphagnum peat 1/1) on the production and the chemical content of cuttings yielded on Pelargonium mother plants grown with feeding solutions of different nitric nitrogen/ammonium nitrogen ratio (12/2 and 4/10). | |
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