Life Sciences Commons^™

Isolation From Soil Microorganisms That Are Inhibitory To Wheat Seeding Pathogens, Kynita Wilson-Humphrey

McCabe Thesis Collection

Many diseases caused by bacteria, viruses, or fungi are responsible for the ruin of a great number of crops annually. At present, many of these crops are being treated for diseases by synthetic or man-made chemicals. Some of the chemicals have been proved to have adverse effects on the environment, including humans and animals. Very few non-chemical means are available to farmers at this time to control these pathogens. This is due to the fact that many of the means of control have little effect against the pathogens or diseases. This research attempts to isolate microorganisms from the soil which …

The Effects Of Osmotic Potential On Ammonification, Immobilization, Nitrous Oxide Production, And Nitrification Rates In Penoyer Soil, Andrew P. Low

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An isotopic dilution method was used to test the effects of osmotic potential, (𝛹_s), upon nitrification, ammonification, N-immobilization, and nitrous oxide production rates in soil at solute concentrations encountered in Penoyer soil. A nitrification potential assay was also performed to approximate maximum nitrification rates.

Nitrification potential rates in soil slurries exponentially declined in response to decreased osmotic potential. However, nitrification was independent of salt concentration at the ambient NH₄⁺ concentrations of the soil. The differential response was attributed to the variable NH_4⁺ substrate quantities. The effects of osmotic potential were secondary to NH_{4 …}

Assessment Of The Suitability For Horticulture Of The Packsaddle Infill Area, Kununurra, N Schoknecht

Resource management technical reports

A brief assessment of the suitability of 142 ha in the Packsaddle infill area for horticulture was conducted in late August 1993. Of this area 100 ha is Crown Land, and 42 ha was recently sold as freehold. Eleven map units based on soil and landform were identified, and their suitability for horticulture assessed. The map units were based on field observations and extrapolation from existing surveys.