ISHS Acta Horticulturae 548: International Symposium on Growing Media and Hydroponics
EFFECT OF DIFFERENT SOIL WATER POTENTIAL ON SUMMER GROWN POINSETTIA (Euphorbia pulcherrima Wild. 'Lilo') |
| Authors: | J.S. Nowak, Z. Strojny |
| Keywords: | water stress, water deficit, drought stress, high soil moisture |
| Abstract:
Euphorbia pulcherrima Wild. 'Lilo' was grown in containers in 60% peat, 30% perlite and 10% clay (v/v) mixture, with different irrigation treatments based on soil water potential. Plants were grown in summer (from March to June) and watered at two levels of drought stress: -50 kPa or wilting. The treatments were applied at different stages of plant development for a month or soil was brought to the moisture stress only twice. Additionally some plants were watered at -50 kPa during the entire cultivation period while the control plants were watered at -5 kPa. There were also treatments with high soil moisture (watering at -1 kPa) during the whole cultivation period, with regular or additional fertilizer and for a month during bract coloration. Soil water potential was measured with tensiometer. Stress of -50 kPa or wilting applied during the vegetative growth stage had little effect on plant growth and development. Water potential of -1 kPa with additional fertilizer had a positive effect on growth and fresh weight of plants. High soil moisture also promoted the self-branching of non-pinched plants. | |
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