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ARS Home » Pacific West Area » Kimberly, Idaho » Northwest Irrigation and Soils Research » Research » Research Project #433929

Research Project: Estimating Nitrogen Mineralization and Emissions in Irrigated Croplands Receiving Dairy Manure

Location: Northwest Irrigation and Soils Research

Project Number: 2054-12000-011-07-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Jun 9, 2014
End Date: May 31, 2018

Objective:
To evaluate the influence of soil and manure characteristics on nitrogen mineralization and emissions in irrigated croplands. This will include field and laboratory research to assess nitrogen mineralization with varying manure and soil characteristics and assess gaseous losses of nitrogen in western semi-arid soils receiving dairy manure and fertilizers.

Approach:
This work will evaluate the effects of soil type and dairy manure application rate and timing on nitrogen mineralization and gaseous losses of nitrogen from the system. A long-term study will be utilized in this research to improve estimates of nitrogen cycling and losses in an integrated dairy crop production system. Nitrogen mineralization will be determined using a buried bag technique in the field and also via incubation studies. Losses of nitrous oxide will be monitored continuously using automated chambers. Total nutrient balances will be calculated based on soil nitrogen, manure and fertilizer nitrogen inputs, crop removal, and losses via gas emissions or leaching.