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The Effect of Salinity on the Growth of Lavender Species
Open AccessArticle

The Effect of Irrigation Treatment on the Growth of Lavender Species in an Extensive Green Roof System

1
Laboratory of Floriculture and Landscape Architecture, Department of Crop Science, School of Plant Sciences, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece
2
Laboratory of Agricultural Hydraulics, Department of Natural Resources Management and Agricultural Engineering, School of Environment and Agricultural Engineering, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece
3
Laboratory of General and Agricultural Meteorology, Department of Crop Science, School of Plant Sciences, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 863; https://doi.org/10.3390/w12030863
Received: 30 January 2020 / Revised: 4 March 2020 / Accepted: 17 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Study of the Soil Water Movement in Irrigated Agriculture )
In green roofs, the use of plant species that withstand dry arid environmental conditions and have reduced water requirements is recommended. The current study presents the effect of irrigation amount on the growth of four different species of lavender; Lavandula angustifolia, Lavandula dentata var. candicans, Lavandula dentata var. dentata, and Lavandula stoechas established on an extensive green roof system and used in urban agriculture. Two irrigation treatments (high and low) determined by the substrate hydraulic properties were applied. Plant growth studied at regular intervals included measurements of plant height, shoot canopy diameter, plant growth index, shoot dry weight and stomatal conductance. The results were consistent and showed that low irrigation reduced plant growth. With the exception of L. stoechas, the appearance of plants watered with the low irrigation treatment was satisfactory, and their use under low water amount irrigation is supported. Interspecies differences among lavender species were present in both irrigation treatments. Overall, L. dentata var. candicans showed the greatest growth, followed in descending order by L. dentata var. dentata and L. angustifolia. In parallel, for stomatal conductance, L. dentata var. candicans showed the lowest value, similar to L. dentata var. dentata, and L. angustifolia the largest. Differences in plant characteristics and size among the latter three species can be considered in the design of extensive green roof systems. The use of substrate hydraulic properties was shown to be important for irrigation management on extensive green roof systems. View Full-Text
Keywords: drought tolerance; substrate hydraulic properties; substrate available water; ornamental; aromatic; urban agriculture; green infrastructures drought tolerance; substrate hydraulic properties; substrate available water; ornamental; aromatic; urban agriculture; green infrastructures
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Paraskevopoulou, A.T.; Tsarouchas, P.; Londra, P.A.; Kamoutsis, A.P. The Effect of Irrigation Treatment on the Growth of Lavender Species in an Extensive Green Roof System. Water 2020, 12, 863.

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