There are two main mechanisms that lead to the display of hydrophobic character in sands and soils. The first is the accumulation of waxy hydrophobic organic matter onto the soils from the crop being harvested, this material anneals over time, hardening over cycles of heating and cooling, to the point where the coating cannot be easily wetted nor removed. The second is the morphology of the sand particle that has a high surface tension due to its shape.
In areas where hydrophobic layers of soil are nested on clay or clay loams, the use of organic surfactants has been a common practice to promote water infiltration. For areas where there are deep reserves of hydrophobic sands, the use of conventional surfactants can be counterproductive as run off is shifted from the horizontal to the vertical planes, and greater reliance is placed on organic matter to retain water.
At CHT, with our focus on surface tension, we look at methods to reduce the surface tension of the sand particle, or to reduce the surface tension of the waxy build up as well as increasing the non-metallic cationic charge of the soil particle to rebalance the hydraulic conductivity of the soil.
With the modification of surface tension we improve the infiltration through the soil and within the CHT product concept, it is not enough to only reduce the surface tension of the soil using surfactants, but consequential drainage needs to be mitigated by increasing the cationic charge of the soil particle.
Examples of changes to surface tension of various surfactants may be found here:
33 Elliott Road
Victoria Australia 3175
+61 3 9706 7400
+61 3 9706 7411
We respect your privacy and do not tolerate spam and will never sell, rent, lease or give away your information (name, address, email, etc.) to any third party.