In general, the larger the seed the deeper it needs to go in the ground. Clovers, brassicas, and the small-seeded grasses (millet, ryegrass, fescue, etc) tend to broadcast very well. We do recommend that even with broadcasting small seeds, find some way to increase the seed to soil contact either by dragging, running livestock across the field, or running a cultipacker after seeding. This is especially critical if there is residue on the soil surface. Larger seeds (peas, sorghum sudan, cowpeas, small grains) are more likely to fail if broadcasted. If you absolutely cannot drill, select small seeds that broadcast successfully.