Plants Commons^™

Mycorrhiza-Mediated Recruitment Of Complete Denitrifying Pseudomonas Reduces N2o Emissions From Soil, Xia Li, Ruotong Zhao, Dandan Li, Guangzhou Wang, Shuikuan Bei, Xiaotang Ju, Ran An, Long Li, Thomas W Kuyper, Peter Christie, Franz S Bender, Ciska Veen, Marcel G A Van Der Heijden, Wim H Van Der Putten, Fusuo Zhang, Klaus Butterbach-Bahl, Junling Zhang

Faculty, Staff and Student Publications

Background: Arbuscular mycorrhizal fungi (AMF) are key soil organisms and their extensive hyphae create a unique hyphosphere associated with microbes actively involved in N cycling. However, the underlying mechanisms how AMF and hyphae-associated microbes may cooperate to influence N2O emissions from "hot spot" residue patches remain unclear. Here we explored the key microbes in the hyphosphere involved in N2O production and consumption using amplicon and shotgun metagenomic sequencing. Chemotaxis, growth and N2O emissions of isolated N2O-reducing bacteria in response to hyphal exudates were tested using in vitro cultures and inoculation experiments.

Results: AMF hyphae reduced denitrification-derived N2O emission (max. 63%) …

Dissolution And Precipitation Of Gypsum In The Soil Under Irrigation, Badier J. Alawi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two soils were used in this soil column study. Yolo loam soil a non-calcareous, non-gypsiferous soil from central California and Vernal soil a calcareous soil from eastern Utah.

Initial studies were conducted where the solubilities of pure CaC0₃ and CaS0₄ ' 2H₂0 were determined in the presence of Logan river water, a KCl solution (2.8 mmhos/cm) and a K₂S0₄ solution (2. 7 mmhos/cm). Gypsum was more soluble in the KCl solution than in the K₂S0₄ solution. The solubility product of both gypsum and lime were determined from the analytical …

Boron Movement In Soil Columns, Joseph William Stucki

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Three adsorption theories--Langmuir, B.E.T., and Freundlich--were applied to boron interaction with Aiken clay loam and Vernal sandy loam soils to determine which bests describes the system.

Column studies were conducted to obtain constants related to mass fluid flow and fluid dispersion within the column. An inert ion was used to obtain the pore volume and to calculate the fluid dispersion coefficient. These data were used to solve the material balance equation by the explicit numerical method developed by Lai for a digital computer. The output from the computer was a predicted profile boron distribution within the soil column.

The soil …