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Managing Summer Forages After a Frost

November 1, 2024

Frost is a concern for certain forage crops/pasture plants like forage sorghum, grain sorghum, johnsongrass, sorghum-sudangrass, and sudangrass. These grasses contain a compound called Dhurrin which gets converted to cyanide (also known as Prussic acid) during stress events like frost or drought. 

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In Summer Annuals Tags prussic acid poisoning
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Fall Pasture Management

October 28, 2021

Forages going dormant is significant. USDA-NRCS defines stockpiling as 'allowing standing forage to accumulate for grazing at a later period, often for fall and winter grazing after dormancy.' The key word here is dormancy.

Once dormant, they can be grazed with less harm to energy reserves. Forage plants are sensitive to grazing in the fall. That is why I usually promote the use of annuals or crop residue, or ideally the combination of the two in the early fall. It allows the pastures to recuperate and build reserves.

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In Grazing Forages Tags grazing management, fall grazing management, prussic acid poisoning
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Prussic Acid Precautions - Frost and Sorghum Sudangrass

October 17, 2013

Here's a timely reminder from the University of Wisconsin on the dangers of prussic acid poisoning when feeding sorghum, sorghum sudangrass, or sudangrass after a frost. 

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In Supplemental Forage Tags prussic acid poisoning, sorghum sudangrass
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