We've had some nice harvesting weather this fall but the lack of a hard frost has thrown a wrench into grazing covers. For those with cattle on cover crops, Jenny Rees, extension educatior, warns, "Please be aware of the potential for nitrate and prussic acid poisoning with the light frosts. Nitrogen moves from the roots up the plant. When a frost occurs, nitrates accumulate in the plant, and, we had lighter frosts for several days in a row. For sorghum species where prussic acid poisoning is also of concern, we say to wait at least 5 days before returning animals back to the field after fr...