ISSUE 10   July 17, 2008

THE CHANGING VALUE OF STRAW

With wheat harvest now in sight, there has been renewed interest in the fertilizer value of straw. The amount of N, P and K in straw will vary with native and applied fertility. However, a reasonable average is:

13 lb/ton N
4.5 lb/ton P2O5
16 lb/ton K2O

Using current costs (N at 80 cents/lb N, P2O5 at $1/lb, and K2O at 50 cents/lb), the fertilizer value of the straw will be about $23/ton. Growers should use their current N, P and K costs along with the content figures above to determine real-time costs on their farm.

Dave Franzen
NDSU Extension Soil Specialist
701-231-8884
david.franzen@ndsu.edu


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