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Dairy Manure Nitrogen Availability in Eroded and Noneroded Soil for Sugarbeet Followed by Small Grains

Lentz, R.D. and Lehrsch, G.A. and Brown, Bradford and Johnson-Maynard, J. and Leytem, A.B. (2011) Dairy Manure Nitrogen Availability in Eroded and Noneroded Soil for Sugarbeet Followed by Small Grains. Agronomy Journal. 103(3):628-643. 9 May 2011.

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Efficient recycling of abundant manure resources from regional dairy industries in the semiarid West requires a better understanding of N availability in manure-amended soils. We measured net N mineralization using buried bags, and crop biomass, N uptake, and yields for sprinkler-irrigated, whole (noneroded) and eroded Portneuf soils (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) subject to a one-time manure application. Treatments included a control, fertilizer, two rates of composted dairy manure (28.4, 64.3 Mg ha–1, dry wt.), and two rates of stockpiled dairy manure (23.3, 45.7 Mg ha–1, dry wt.) applied in the fall before the Year 1 cropping season. Plots were planted to sugarbeet (Beta vulgaris L.), winter wheat (Triticum aestivum L.), and spring barley (Hordeum vulgare L.) during the 3-yr study. Overall, net N mineralization rates were low to moderate during winter through spring, decreased in early summer due to N immobilization, then increased to a maximum in late summer, followed by a decrease in fall. Th e mean mineralization rate (as a percentage of the added organic N) for Years 1, 2, and 3 was –4.2 (N immobilization), 4.3, and 4.8% for compost and 17.4, 17.0, and 11.4% for manure, respectively. Relative to controls, compost and manure treatments as a group increased total 3-yr net N mineralization more for eroded (1.77×) than for whole soils (1.55×). At higher rates, manure also increased immobilization and mineralization in 30- to 60-cm soil depths (below the zone of incorporation). To optimize the use of N mineralized in southern Idaho’s manure-amended soils, one should consider the type manure employed and the erosion status of the soil receiving the amendment.

Item Type: Article
NWISRL Publication Number: 1390
Subjects: Manure
Soil > Amendments
Soil > Chemistry > Nitrogen
Depositing User: Users 6 not found.
Date Deposited: 10 May 2011 16:35
Last Modified: 21 Mar 2014 16:21
Item ID: 1420