## A mid-rotation pine stand fertilization calculator

for material needs, cost, and rate of return

### R. Hitchcock, D. E. Kissel, and D. Dickens

Calculating pounds per acre of fertilizer materials needed and cost for a single NP or NPK fertilizer application in a loblolly, longleaf, or slash pine stand based on a publication by Dickens, Moorhead, Morris and Kissel (2010):

A checklist for fertilization of loblolly, longleaf, and slash pine stands

Usually a stand is fertilized with N and P so there will be many cases where K is not needed.

Stands that need K added are where foliar K < 0.25%, especially in longleaf stands.

#### Options

P Source:

#### 1. Fertilizer materials needed

Nutrient | Pounds per acre needed | |||
---|---|---|---|---|

Elemental nutrient | Urea (46-0-0) | DAP (18-46-0) | MOP (0-0-60) | |

Nitrogen | 75 - 250 | |||

Phosphorus | 20 - 50 | |||

Potassium | 40 - 80 |

#### 2. Cost per acre for fertilizer materials

Enter total cost per acre if known: $

Otherwise, enter the data below:

Fertilizer material | Pounds per acre | Cost per ton ($) | Cost per pound of nutrient ($) | Cost per acre ($) | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|

Urea | N: | ||||||||||

DAP | P: | ||||||||||

MOP | K: | ||||||||||

Fertilizer cost per acre | |||||||||||

| |||||||||||

Total cost per acre |

#### 3. Rate of return (ROR) estimates based on fertilizer cost and anticipated extra wood value grown

Up-front cost | Final harvest numbers | |||||
---|---|---|---|---|---|---|

Total cost per acre | Estimated extra wood growth rate (tons/ac/yr) | Value of extra wood grown ($/ton) ^{*}
| Number of years to final harvest | Extra wood grown final value ($/ac) | Rate of return expressed as interest rate | |

5 - 10 years |