Reference Projects
Citrus and Date Palm Trial, Saudi-Arabia
At the Al Khalediah Farm, Tebrak, Saudi-Arabia, Geohumus was incorporated into the root zone (60 cm deep) of 5 citrus trees and 5 date palms. Using the Revita® air injector device (Spindler, Ulm Germany) ca. 1 kg of Geohumus was injected at 6, respectively, 10 different locations in a circular pattern around individual citrus trees and date palms. Two weeks after incorporation of Geohumus and normal irrigation the amount of water supplied to the Geohumus treated plants was reduced by 25% compared with untreated plants.
Incorporating Geohumus in soil of citrus trees with the Revita® air injector device.
Incorporating Geohumus® in soil of date palms with the Revita® air injector device.
For both production systems, citrus and dates, the soil under Geohumus treatment supplied with 25% less water significantly exceeded the threshold value of the corresponding water content in the control treatment. For the observation phase, the proportion of saved water prevented from seepage and/or evaporation loss was therefore more than 25%.
Water storage in soil under citrus trees treated with and without Geohumus. Bars indicate average values; percent values indicate the proportion of stored irrigation water due to Geohumus.
Water storage in soil under date palms treated with and without Geohumus. Bars indicate average values; percent values indicate the proportion of stored irrigation water due to Geohumus.
Project partner
Al Khalediah Farm
Hisham Al-Tonobey, Managing Director
Dr. Mohammed Ali Bob, Plant Protection Specialist
Justus-Liebig-University Giessen
Prof. Dr. Hans-Georg Frede, Soil Scientist and Director
David Windhorst, Agriculturalist