Yellow Nutsedge: <BR>45 C for 8 hours = > 90% Tuber Viability <BR>50+ C for 15 minutes = < 50% Tuber Viability <BR>Purple Nutsedge: <BR>50 C for 8 hours = > 70% Tuber Viability <BR>55 C for 4 hours = < 20% Tuber Viability <BR>60 C for 1 hour = < 5% Tuber Viability <BR>How hot can we get our soils? <BR>How long can they stay this hot?<BR>Preliminary Conclusions Lethal Temperature/Duration of Exposure:<BR>