COLUMBIA, Mo. – Drought increases the chance of nitrate poisoning and prussic acid poisoning. High concentrations in plants and water can harm or even kill animals. High nitrate, mostly concentrated in grass stems, causes quick death, says University of Missouri Extension agronomist Jill Scheidt. Nitrate in the blood blocks oxygen uptake. Without oxygen, cows die quickly. Quick testing is vital to helping animals survive, Scheidt says. Most MU Extension centers offer diphenylamine-sulfuric acid…