Those impacts can take the form of the effect on the crop itself. In terms of soil organic matter, it depends on the crop, on the amount of biomass and the amount of material that goes into the soil after they've harvested. If there's a very severe drought and a reduction in the yields, that's a good indicator that the amount of organic matter going into the soil is going to be reduced quite a bit. That in itself is a problem.
Increased variability is also a problem, such as the high rainfall that's happening in Manitoba right now. It's difficult for the farmers to get on the field to plant the crop, or there's delayed seeding, and that again affects the crop.
It's not just drought. Any sort of extreme weather event hampers productivity. Once you start hampering the productivity of the crop and the amount of material that goes in, that affects organic matter levels and all of the organic part of the soil.