DEVELOPMENT OF HYDROPONIC SYSTEMS FOR URBAN FACADE GREENERY
The basic idea was to set up a stable and functional facade greenery, especially in locations, where the circumstances offer less supply to a plant; what is usually the case in urban areas. The developed concept is using the Instant Hedge (readily usable hedge elements in containers) as facade greenery, growing in a hydroponics system. Special interest was given to study the growth parameters of the experimental plant Hedera helix cv. Woerner, with the purpose to recommend one side of the compass for the best or worst growth. For this reason, the research setup was installed at different sides of our research greenhouse. (north / south / east / west). The experiment was arranged as a free randomized installation with four replications. The hedge elements were cultivated in a special substrate for extensive roof greenery. Fertigation was monitored by time and radiation. Over time, all the leaf areas or LAI showed an increased state. The LAI average measured at each exposition at the end of the testing period was between 7 (East) and 8.51 (South). These leaf area indexes lay in between or even higher than those of conventional facade greenery with Hedera helix L. (2.6-7.7). The LAI in the experiment would have even been higher, if the pruning would have been taken into consideration. Looking at the dry matter a difference between North and South becomes obvious. Due to the high radiation and sunshine duration there is a higher amount of dry matter on the South side (28.14 g DM/100 g FM) than on the North side (23.28 g DM/100 g FM). The water content is consequently reversed (North 77% and South 72%). The water content in the experiment was at least 11% higher than the one of a conventional method. It can be concluded, that the hydroponic growth of Hedera helix was more efficient than the conventional facade greenery. A scientific statement about which side showed the best results was impossible, because the status of the plants at the beginning was not comparable. Further tests in the new growth period are necessary to see whether notable differences occur.
Wolter, S., Diebel, J. and Schroeder, F.-G. (2009). DEVELOPMENT OF HYDROPONIC SYSTEMS FOR URBAN FACADE GREENERY. Acta Hortic. 843, 393-402
Hedera helix, 'Instant Hedge', leaf area index (LAI), particulate matter (PM 10), living wall