Abstract
<p>The aim of this study was to analyze the physiological and morphological response of <em>Syringa meyeri </em>‘Palibin’ to different levels of irrigation and to evaluate regulated deficit irrigation (RDI) as a possible technique for saving water in nursery production and promoting of flowering. Plants were grown in 3 liter containers in an unheated greenhouse and were subjected to six irrigation treatments for 18 weeks from the be- ginning of June to mid-October 2011. A drip irrigation system was used. Irrigation treatments were established on the basis of evapotranspiration (ETp). Three constant irrigation treatments were used: 1) 1 ETp; 2) 0.75 ETp; 3) 0.5 ETp, while the other three with irrigation varying between phases were as follows: 4) 1–0.5–1; 5) 1–0.25–1; and 6) 0.5–1–0.5 ETp. The 0.75 ETp and 0.5 ETp irrigation regimes adversely affected the growth and visual quality index of plants as well as they resulted in reduced leaf conductance, transpiration, maximum quantum efficiency of photosystem II (Fv/Fm) and CCI (chlorophyll content index). Plants grown under the 1–0.5–1 ETp regime had the same morphological parameters as plants grown under the 0.5 ETp treatment. A further reduction of water quantity supplied to plants in the 1–0.25–1 ETp regime resulted in further deterioration of the visual quality index of plants. In this study, the quality index of plants exposed to 0.5–1–0.5 ETp was similar to control plants (1 ETp). These plants were lower, more compact, and had smaller leaves than control plants. The irrigation regimes imposed in this study had no significant effect on the number of floral buds formed in relation to the control regime, except for 1–0.25–1 ETp where this number decreased.</p>
Highlights
Ornamental plant nurseries generally consume relatively large amounts of water
The level of water deficit applied had a significant effect on the visual quality index of Syringa meyeri ‘Palibin’ plants
Under the T(0.5–1–0.5) water regime, lilacs were obtained with a quality index similar to that of well-watered control plants
Summary
Ornamental plant nurseries generally consume relatively large amounts of water. Species and varieties of plants cultivated there often have different water requirements [1]. Plants in nurseries are often subjected to undifferentiated irrigation regimes and it is usually imprecise top irrigation with sprinklers. In such irrigation systems, water is usually used with excess to meet the needs of all cultivated plant species and varieties, regardless of the size of the containers in which plants are grown. Water is usually used with excess to meet the needs of all cultivated plant species and varieties, regardless of the size of the containers in which plants are grown This method of cultivation causes a considerable loss of water and nutrients that are washed away from the ground and leak into the environment leading subsequently to pollution [2]
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