The amount of phosphorus in chicken and hog manure has come under increased scrutiny. Most nutrient management programs focus primarily on nitrogen. Unfortunately, when hog and chicken manure is put on farmland based on the nitrogen needs of a crop, there often is an over application of phosphorus, which ends up polluting ground and surface water. If manure is applied based on phosphorus need, however, it doesn't contain enough nitrogen. Commercial sources of nitrogen must be purchased and less manure can be used.
But these types of tradeoffs may not be required often, thanks to some technological breakthroughs. For instance, the Lancaster (PA) Intelligencer recently wrote about …
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