Nitrogen Mineralization Rates in Long-Term Manured
Fields Estimated using Lab Incubation Experiment
Volume 4 - Issue 2
Haiying Tao*, William L Pan and Eric Bietila
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- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
*Corresponding author:
Haiying Tao, Department of Crop and Soil Sciences, Washington State University, Pullman,WA,USA
Received: November 19, 2019; Published: December 02, 2019
DOI: 10.32474/OAJESS.2019.04.000184
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Abstract
Land application of dairy manure is a typical method for dairy farmers to recycle manure nutrients. Long-term dairy manure
applications can improve soil organic matter and, as a result, potentially increase soil nitrogen availability through mineralization.
However, little is known about N mineralization rates in long-term manured soils; therefore, the amount of N available to crops
in any given growing season is uncertain. This study conducted a 77-day lab incubation study to estimate N mineralization rates
using 102 intact cores collected from the 0 to 30.5 cm surface soils of 24 long-term manured corn-alfalfa-alfalfa-alfalfa fields and
10 nearby uncultivated native sites in Yakama County, Washington. We found that the average N mineralization rate in the longterm
manured fields was 55 kg N ha-1 for every 1% SOM during the 77 days incubation period, which was much higher than the
commonly used book value of 22 kg N ha-1 annually for every 1% SOM.
Keywords: Nitrogen Mineralization; Dairy Manure; Incubation; Soil Nitrogen
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