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                                    Manure 'Smells Like Money' As Energy Costs Rise







ScienceDaily
(Sep. 10, 2008)

— With energy prices driving the cost of agricultural inputs up, nutrient-rich manure is getting another look.

"Calls to Extension offices from people looking for manure and manure compost have increased in recent months," says Tommy Bass, Montana State University Extension livestock environment associate specialist.

Bass said that this shift in perception is good for water quality, too.

"As manure gains value, it is likely to be used more efficiently and effectively. There's a potential for increased revenue for animal feeding operations," he said.

Though MSU Extension and conservation professionals have taught for years that manure can be a valuable asset, it's often written it off as a difficult-to-manage byproduct with cumbersome regulations.

Now, with fertilizer prices hovering at $1,000 per ton, the nitrogen and other nutrients in manure look more gold than brown.

Bass said that a ton of manure contains between $30 to $40 dollars worth of nutrients for the soil, though they're not all available the first year.

"Expect a quarter to a half of the nitrogen to be available in the first season," he said, "The remainder is partially available the next year and partially lost to the atmosphere."

Fresh scraped and stacked dairy and beef manure can have a total nitrogen content ranging between 12 and 25 pounds of nitrogen per ton of manure, while the same ton may also have 9 to 18 pounds of phosphorus fertilizer equivalent.

"The nutrient content of manure varies for different species and different manure management systems, but it is all valuable," he said.

Nitrogen and phosphorus are not the only valuable nutrients in manure. Potassium and a variety of micro-nutrients are also present.

In addition to specific nutrients, the high organic content of manure and manure compost improves soil quality, and its improved texture improves its water and nutrient holding capacity.

About 70 to 90 percent of phosphorus and potassium can be available the first year. Phosphorus not used by the plant persists longer in the soil and will remain available if erosion and run-off are controlled.

When applying manure based on the nitrogen needs of a crop, phosphorus will inherently be over applied or exceed the crop's annual use of phosphorus, however it can be taken up by crops in subsequent years. Fields with significant residual soil test phosphorus may need a rest from manure applications. In that case only a commercial nitrogen product needs to be applied to meet nutrient requirements and production goals.