Seeding rates can get complicated. First, listed seeding rates are the recommended rates for a single-species planting planted with a drill. However, when mixing species, the standard recommendations are: 1) for a mix of two species, cut the poundage per acre for each by 1/3; 2) for three or more species, cut the poundage for each by half. But again, those rates are for planting with a drill. If broadcast seeding, the recommendation is to increase the rate by 50% (because of much lower germination rates when seed is broadcast versus a drill).
So let's say you're mixing Wheat and Crimson Clover. The wheat's recommended seeding rate is 100-120 pounds per acre. The Crimson is 20-25 per acre. Because this is a two species mix, each should be cut by 1/3. That gives a seeding rate of 67-80 pounds for wheat and 14-17 pounds for the Crimson. But if you are broadcast seeding instead of drilling, each needs to be increased by 50%. So if broadcast seeding, the rates jump back up to the original 100-120 for wheat and 20-25 for Crimson.
