<H1>Preliminary Conclusions Lethal Temperature/Duration of Exposure:</H1> <P><UL> <LI><H2>Yellow Nutsedge: </H2> <UL> <LI>113 F for 8 hours = > 90% Tuber Viability <LI>122+ F for 15 minutes = < 50% Tuber Viability </UL></UL><UL> <LI><H2>Purple Nutsedge: </H2> <UL> <LI>122 F for 8 hours = > 70% Tuber Viability <LI>131 F for 4 hours = < 20% Tuber Viability <LI>140 F for 1 hour = < 5% Tuber Viability </UL></UL><UL> <LI><H2>How hot can we get our soils? </H2> </UL><UL> <LI><H2>How long can they stay this hot?</H2> </UL></P> <P></P> <P>