COMPARATIVE EVALUATION WITH BIOMETRIC AND PHYSIOLOGICAL CHARACTERISTICS OF ORNAMENTAL SHRUBS AS FOR THEIR CONTRIBUTION TO THE ENVIRONMENT UNDER TWO IRRIGATION FREQUENCIES
Aiming at reducing the consumption of water for irrigation of urban green areas, with the smallest possible effects on benefits of vegetation in the environment, a comparative evaluation of growth of three evergreen ornamental shrubs under the influence of two irrigation frequencies was carried out. Rooted cuttings of Elaeagnus pungens Thunb., Ligustrum japonicum Thunb. and Viburnum tinus var. lucidum Ait. were planted in pots with peat: perlite (1:1 v/v), in a heated glasshouse. From May till September plants were irrigated every 3 or 6 days depending on treatment and from October till December every 5 or 10 days, respectively. Reducing the frequency of irrigation led to a reduction of the total shoot length, leaf number and total leaf area of the plants in all three species, as well as the fresh and dry weight of the aboveground section; the weight of the roots was also reduced in V. lucidum and L. japonicum. Leaf stomatal resistance measurements showed that sparse irrigation resulted in a significant water stress in L. japonicum and a very big stress in V. lucidum, while the stress in E. pungens was very small. The reduction in total leaf area under sparse irrigation was 20% in E. pungens and 32% in V. lucidum and L. japonicum. However, despite the reduction of leaf area V. lucidum under sparse irrigation developed 78% and 41% greater total leaf area compared to the sparsely and normally irrigated E. pungens, and 30% greater total leaf area compared to the sparsely irrigated L. japonicum. The sparsely irrigated L. japonicum developed 36% and 9% greater total leaf area compared to the sparsely and normally irrigated E. pungens. Effective quantum yield of PSII was similar in all three species and it was not negatively affected by sparse irrigation.
Papafotiou, M. and Papanagiotou, P. (2013). COMPARATIVE EVALUATION WITH BIOMETRIC AND PHYSIOLOGICAL CHARACTERISTICS OF ORNAMENTAL SHRUBS AS FOR THEIR CONTRIBUTION TO THE ENVIRONMENT UNDER TWO IRRIGATION FREQUENCIES. Acta Hortic. 990, 369-372
Elaeagnus pungens, Ligustrum japonicum, Viburnum tinus var. lucidum, water stress, biometric characteristics, leaf stomatal resistance, urban green, chlorophyll fluorescence