ISSUE 10   July 17, 2008


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

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