Now look at the total amount of nutrients needed for the crop (Step 1) and the total nutrients in the manure pile (Step 2).
Spread enough manure on the field to supply all of the crop’s N or P2O5 needs (whichever is less), and that is… “just enough.”
This varies widely depend- ing on the amount of bedding use. On average, however, a 1,000-pound adult horse bedded with wood chips or sawdust will generate about 25 cubic yards of manure
and bedding per year. To limit runoff, manure should be stored at least 50 feet from any drain- age way or water course and be surrounded by grass (Figure 2).
For more information, see the Small Farms fact sheet titled “Got Barnyard and Lot Runoff?”
Check with the USDA Natural Resource Conservation Service (NRCS) office or your local Conservation District for technical help on building good manure storage structures. In some cases, state or federal