A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Author: Atarah al'Norahn
She is the first of the Seanchan to reach the aqueduct with forkroot. She starts to slash open one of the sacks, and Perrin tells her to do it over the opening of the aqueduct so that not a single grain gets wasted. She looks to Mishima for confirmation, and he tells her to do as Perrin says. Once she is done and is replaced by another soldier with sacks of forkroot, she goes to get more.
(Reference: Knife of Dreams, Chapter 26)