Abstract
Abstract Dracaena marginata L. and Spathiphyllum Schott. ‘Mona Loa’ were grown for 90 days in either one of two ‘self-watering’ containers, one plastic and one kiln-fired clay. The plastic container relied on the upward movement of water via capillary flow from a subjacent reservoir. The kiln-fired clay container was a ‘pot-within-a pot’ design with an adjacent water reservoir located between the larger and smaller pots. Water seeped horizontally through the inner pot along the pot-rooting medium interface. Reservoirs of each container were filled with either one of three levels of saline water (0.3, 1.3, or 2.3 dS/m). Rooting medium leachate electrical conductivity was lower for ‘pot-within-a-pot’ containers compared with the plastic containers. Irrespective of irrigation salinity, canopy leaf area, root length, shoot to root ratio, gas exchange values, and foliar visual quality of both species were highest for the ‘pot-within-a-pot’ containers. Also, Dracaena leaf area and dry weights were highest for the ‘pot-within-a-pot’ container. Increased irrigation salinity decreased canopy area and visual quality of Spathiphyllum. Shoot dry weight and shoot to root ratio were highest for Dracaena at the 1.3 dS/m salinity level.
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