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The Value of Straw (08/18/16)

Although the content of N, P and K are dependent on the amounts of plant nutrients available, and K content of straw decreases when rain falls on it, through it, after harvest, the following are reasonable numbers to estimate the N, P and K content of straw.

The Value of Straw

Although the content of N, P and K are dependent on the amounts of plant nutrients available, and K content of straw decreases when rain falls on it, through it, after harvest, the following are reasonable numbers to estimate the N, P and K content of straw. Other nutrients are not considered because the amount of nutrient is so small (S, micronutrients) or there are plenty of the nutrients in the soil, so removal (Ca, Mg) are not considered in the value calculation.

Nitrogen- 13 pounds per ton

Phosphorus (P2O5) – 3.6 pounds per ton

Potassium (K2O) – 24 pounds per ton

At present, my estimate of retail prices for N, P and K follow. These are ballpark estimates based on wholesale pricing, and a reasonable figure for transportation and markup. Fertilizer prices are volatile commodities and the prices I have used are for example only. Using your local pricing, available to you if you ask, you can figure out the value of each nutrient at today’s costs yourself.

I used $400/ton for 11-52-0 (MAP), $280/ton for 46-0-0 (urea), and $280/ton for 0-0-60 (potash).

Value of phosphorus- $1.38 (includes 4 lb. N)

Value of N- 2.73 (for remaining 9 lb. N)

Value of K- 5.37

Total fertilizer value of wheat straw- $9.48 per ton.

Dave Franzen

NDSU Extension Soil Specialist

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