Long-Term Effects of Semisolid Beef Manure Application to Forage Grass on Soil Mineralizable Nitrogen
- Mehdi Sharifiabcde,
- Bernie J. Zebarth *abcde,
- David L. Burtonabcde,
- Vernon Roddabcde and
- Cynthia A. Grantabcde
- a Environmental Sciences Dep. Nova Scotia Agricultural College PO Box 550 21 Cox Rd. Truro, NS, Canada B2N 5E3
b Agriculture and Agri-Food Canada Potato Research Centre PO Box 20280 Fredericton, NB, Canada E3B 4Z7
c Environmental Sciences Dep. Nova Scotia Agricultural College PO Box 550 21 Cox Rd. Truro, NS, Canada B2N 5E3
d Agriculture and Agri-Food Canada 4016 Southampton Rd. Nappan, NS, Canada B0L 1C0
e Agriculture and Agri-Food Canada Brandon Research Centre Grand Valley Rd. Brandon, MB, Canada R7A 5Y3
Livestock manure is an important source of N for forage grass production. The long-term effects of semisolid beef manure application to forage grass on potentially mineralizable N (N 0), mineralizable N pools, and field estimates of soil N supply were evaluated in dike-land (heavy textured, poorly drained) and upland (medium-textured) soils in Nova Scotia, Canada. Treatments included an unfertilized control, annual spring application of 100 kg N ha−1 mineral fertilizer or annual applications of 75, 150, or 300 kg total Kjeldhal N ha−1 as manure (M75, M150, and M300, respectively) from 1995 to 2004. Soil samples collected in fall 2004 were used to estimate N 0 using a 44-wk aerobic incubation at 25°C. The N 0 values were 62 and 49% higher in the M300 treatment (324 and 480 kg N ha−l) than the other manure treatments (199 and 323 kg N ha−1) for the upland and dike-land soils, respectively. The mineralization rate coefficient ranged from 0.045 to 0.082 wk−1 Manure application increased the readily mineralizable N pool (Pool I); higher rates of application resulted in higher values in both soils. The intermediate and stable mineralizable N pools were increased only by the M300 treatment in the upland soil but not in the dike-land soil. Long-term manure application of the M300 treatment resulted in high N 0 with no yield benefits, which can increase the risk of N losses to the environment in both soils, whereas Pool I was responsive to all manure application rates.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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