Dissertation
NITROGEN-PLANT-SOIL INTERACTIONS AT THE ROOT-RHIZOSPHERE, CROPPING SYSTEM, AND NATIONAL SCALES
Doctor of Philosophy (PhD), Washington State University
01/2017
Handle:
https://hdl.handle.net/2376/111198
Abstract
The transport and transformation of N at all scales is of paramount importance to humans. Not only is N crucial for our survival, being a central building block in protein, but N can also be toxic when found in high concentrations in the wrong locations. This work focuses on the importance of the place of N at three distinct scales. 1.) At the seedling root system scale we examined the effects of the concentration of N on causing symptoms of root toxicity, and found increasing ammoniacal-N to increase the symptoms of toxicity to roots. 2.) At the field scale, cover cropping and reduced tillage where assessed for their potential to decrease soil NO3- leaching and increase of N exportation efficiency. 3.) At the national scale a research project database was used to assess the amount of research that has gone into the development of best management practices.
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Details
- Title
- NITROGEN-PLANT-SOIL INTERACTIONS AT THE ROOT-RHIZOSPHERE, CROPPING SYSTEM, AND NATIONAL SCALES
- Creators
- Isaac James Madsen
- Contributors
- William L Pan (Advisor)Steven D Stehr (Committee Member)Harold P Collins (Committee Member)Richard A Rupp (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Crop and Soil Sciences
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 145
- Identifiers
- 99900581830001842
- Language
- English
- Resource Type
- Dissertation