Substrate evaluation and irrigation scheduling for green wall systems
Biang, Johannah Helen
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This experiment was designed to determine a suitable substrate for green wall systems and an irrigation schedule for greatest growth and uniform water distribution. The soilless/compost substrate was found to be the most suitable based on PAW. Basil yield was not different between irrigation treatments, though there was a difference in yield between sides of the walls, with the east side showing a higher yield than the west side. Differences were noted, however, in water use between treatments. Sensor-controlled irrigation treatment was nine times more efficient than the other two treatments, without sacrificing yield. Contour graphs of water distribution showed differences in volumetric water content between the various levels within the walls. As expected, the top level was drier than the middle and bottom of the wall, while the middle and bottom were equally wetter.