The first frost turns sorghum-sudan and johnsongrass into poison for a week. Nitrates never leave.
Prussic acid spikes in sorghum-family forages after a frost and in any regrowth for weeks after. Nitrates build in drought-stressed corn, sorghum, and small grains and do not go away with time or frost. The rules for grazing and haying through October, and the test that costs less than one cow.
6d ago













