![]() ![]() The experimental design was a complete block design, with five water heights treatments (0.75, 1.5, 3.0, 4.5 and 6.0 cm, corresponding respectively to 1/12, 1/6, 1/3, 1/2 and 2/3 of the pot height being under water during irrigation) and two substrates (Peat:Perlite/PP and Pine Bark:Canadian Sphagnum Peat Moss/BS ). The objective of this experiment was to evaluate the water height and substrate type that provides the best water content for growth of subirrigated Salvia splendens 'Vista Red'. Additionally, water heights used inside the benches are often higher than required to promote capillary rise, wasting pumping energy, and applying more water than is required for plant growth. However, subirrigation control is based mainly on timers, without monitoring plant water requirements or substrate moisture, often resulting in excessive water application. This technology delivers water and nutrients to the bottom of pots without wetting leaves, reducing disease spread induced by overhead irrigation systems. Subirrigation in greenhouse production can increase plant uniformity and shorten the crop cycle, with the option to recycle water, avoiding runoff and reducing environmental contamination.
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