The input of this brackish water is carefully managed so that it does not enter mole drains where it would greatly impact the salt-sensitive cane crop.
Rittie ND (2000) The soil and water chemical changes associated with mole drains in acid sulfate soils (ASS) sugarcane fields.
Anecdotally, within Southland, this type of drainage system has often been blamed for rapidly delivering microbial contaminants to waterways by removal of surface water to mole drains via the rip line or slot of the mole plough.
Mole drains are commonly pulled above the fragipan to help drain the upper profile, and our lysimeters penetrated down to just above the fragipan.
We suggest that on-farm irrigation practices, if not carefully controlled, could lead to significant movement of microbes to shallow groundwater and surface waterways because of rapid transport of microbes through larger soil pores even without considering the preferential flow paths generated by the slot of mole drains.
This discrepancy may result from the assumption of an initially well-mixed soil system to mole drain depth, whereas the actual soil [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] concentration on 28 May 1990 decreased with depth.
A simplified analysis of soil water flow to a mole drain.
Two models for the leaching of a non-reactive solute to a mole drain.
The second model was much simpler, effectively treating the water-filled soil volume above the mole drains as a well-mixed system.
executive Charlie Murless, the mole drains were put down after the big
After a group of trainers emerged from the stewards' room, Dermot Weld said: "The mole drains collapsed and the track isn't safe for racing.