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ISSN: 2641-6794

Open Access Journal of Environmental & Soil Science

Mini Review(ISSN: 2641-6794)

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

Abstract| Introduction| Materials and Methods| Results and Discussion| Conclusion| Acknowledgement| Notes| References|

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