The Rijn en IJssel water authority, together with Bureau Waardenburg and the Lumbricus knowledge program, is investigating whether Kaumera extracted from residual water can strengthen dikes.
Earlier research has shown that Kaumera can retain soil moisture well. This makes the top layer more stable. These properties come in handy when it comes to keeping the turf on dikes firm in times of drought.
Trials
Last spring, several pot tests with and without Kaumera were conducted on small areas of soil. The results of these provide sufficient confidence to now conduct the trial on a larger scale. Trial plots, Kaumera spraying and compost application will begin in spring 2025. The trial will take place on the inner slope of the Bevermeerdijk in Angerlo and will last until 2029.
Climate change
Due to changing climate conditions, we are increasingly seeing drought damage to turf on dikes. With the trial, the water authority can investigate whether Kaumera helps with root depth, water retention and variation in plant species on the turf. This will keep the dike stronger and therefore safer during high water.
Kaumera retains moisture
Kaumera has been extracted from the process water of the Friesland Campina dairy factory for some time now. The Rijn and IJssel Water Authority does this in cooperation with several water boards and market parties. Kaumera retains moisture and helps plants grow better. This has been demonstrated in several trials, such as in the planting of young trees.