+1. Unless the amount of corn is catastrophically low, the nutrient levels isn't that much lower. The tonnage is reduced because of the lack of corn which makes up a large chunk of the weight. Many of the nutrients that didn't go into the corn (particularly N, which is why protein levels are higher) have stayed in the stalk.

We sample the silage and look at the dry matter and calorie levels and make adjustments from there. The baseline is normal corn silage, which is worth 10X corn price at 35% dry matter.