The ammonium fraction, originally representing roughly half the potentially available nitrogen, is lost by long-term open lot manure storage, anaerobic lagoons, and surface spreading. Systems that conserve ammonium nitrogen and provide nutrients more in balance with crop needs increase manure's economic value. Odor nuisances are the primary driving factor of more restrictive local zoning laws for agriculture. Better management of manure nutrients through increased reliance on manure storage and land application of manure in brief time periods add to odor nuisances. Manure application systems that minimize odor deserve consideration.
Manure spreaders are heavy.
The manure alone in a 3,000 gallon liquid manure tank weighs more than 12 tons. Manure often is applied in late fall and early spring when soil moisture levels and compaction potential are higher. Impact of manure application on potential soil compaction deserves consideration. Table I. Environmental comparison of various manure application systems. Box spreaders provide either a feed apron or a moving gate for delivering manure to the rear of the spreader.