Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil.
2011-04
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Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil.
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2011-04
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Abstract
Irrigated potato (Solanum tuberosum L.) production requires significant inputs of
fertilizer N for optimal tuber yield and quality. However, high N rates carry the risk of
high N loss, particularly in coarse-textured, well-drained soils where potatoes are
commonly grown. Polymer coated controlled-release ureas (PCU) have shown promise in
reducing NO3
- leaching, a groundwater quality concern, and may potentially also reduce
emissions of N2O, a greenhouse gas with nearly 300 times the warming potential of
carbon dioxide. However, comparisons of multiple PCUs are uncommon. Studies were
conducted over three years to compare N loss (as NO3
- and N2O), yield response, and N
use efficiency (NUE) from an unfertilized control, split applied conventional N fertilizer
(CSA), and two PCU products (PCU-1 and PCU-2) applied at 270 kg N ha-1 yr-1. Tuber
yields, NUE, and leaching did not differ among fertilized treatments. Directly measured
N2O emissions were significantly lower with PCU-1 than CSA. Fertilizer induced
emissions were relatively low, ranging from 0.10 to 0.49% of applied N. Indirect N2O
emissions, estimated using the IPCC default emission factor of 0.75% of NO3
- leached,
were significantly lower than direct emissions. However, due to uncertainty, indirect
emissions could be anywhere from 0.6 to 84.9% of direct. These results show that PCU can potentially reduce N2O emissions. However, results are product specific and work
remains to be done in narrowing the indirect emission factor uncertainty range.
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University of Minnesota M.S. thesis. April 2011. Major: Plant Biology. Advisor: Rodney T. Venterea. 1 computer file (PDF); viii, 154 pages.
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Hyatt, Charles R.. (2011). Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/104614.
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