Yield and quality of carnation (Dianthus caryophyllus L.) and gerbera (Gerbera jamesonii L.) in a closed nutrient system as affected by sodium chloride.
Baas, R., Nijssen, H. M. C., Berg, T. J. M. van den and Warmenhoven, M. G.
Scientia Horticulturae Year: 1995 Vol: 61 Issue: 3/4 Pages: 273-284.
1995
บทคัดย่อ
To study the consequences of using saline irrigation water in closed nutrient systems, effects of increasing NaCl concentrations up to 30 mM on yield and quality of spray carnation and gerbera were investigated. In carnation, peduncle length decreased at salinities more than or equal to 23 mM NaCl. In gerberas, which are less tolerant of salinity, salinity more than or equal to 8mM NaCl reduced the number of flowers, flower weight and flower area. Postharvest vase-life was not affected by salinity. As a similar yield decrease occurred in a treatment in which salinity was increased using increased concentrations of major elements, it is concluded that the yield decrease was not related to specific ion-toxic effects of Na+ and/or Cl-. Chemical analysis of peduncles of carnation or gerbera flowers showed that NaCl concentration had no consistent effect on peduncle concentrations of major elements. Influx concentrations of Na+ were linearly related to the concentration in the nutrient solution. On a
verage, influx was 2.5% and 7% of the Na+ concentration in the nutrient solution for carnation and gerbera, respectively. The consequence is that Na+ accumulates in the nutrient solution more rapidly for carnation than for gerbera. Influx concentrations of Cl- were higher, and not related linearly to the Cl- concentration in the nutrient solution. Average electrical conductivity (EC) needed to compensate for mineral uptake was 0.7-0.8 dS m-2.