Saskatchewan farmer Derek Tallon is harvesting one of the worst lentil crops he's ever grown. Like other farmers in the region, he watched his crops struggle to grow without much rain or reprieve from unrelenting heat during what one expert says is shaping up to be the worst drought in Canadian history. Tallon's farm in southern Saskatchewan only received about 50 millimetres of rain this year, compared to 190 millimetres during a normal year.