Browse on keywords: soil quality Alberta
Search results on 06/17/13
3107. Dormaar, J.F. and C.W. Lindwall. 1989. Chemical differences in dark brown chernozemic Ap horizons under various conservation tillage systems.. Can. J. Soil Sci. 69:481-488.
Soil properties were investigated in two long-term studies: a 19 yr study of till vs. no-till in wheat fallow, and a 9 yr study of till vs. no-till with 3 rotations, including continuous cropping. No-till had the predominant influence on improving various soil physical and microbial properties. There was little difference in continuous cropping versus wheat-fallow, with tillage. The study compared soil from the entire plow depth, and concluded that 19 yr was long enough for the entire Ap horizon to benefit from no-till. No-till in both studies led to 40% of the dry aggregates being >0.84 mm. Dehydrogenase and phosphatase activities were twice as high under no-till as under cultivatiion. No-till also led to the largest monosaccharide accumulation in the soil.
4836. Nesbitt, L.D.. 1950. Save our soil.. Alberta Wheat Pool, Calgary, Alberta, Canada.
Describes the case for soil conservation in the Canadian prairies. Discusses methods to prevent erosion, the importance of grass and maintenance of soil organic matter. Mentions good references, but no citations. Several good quotes about soil conservation.
10576. Janzen, H.H. and G.D. Radder. 1989. Nitrogen mineralization in a green manure amended soil as influenced by cropping history and subsequent crop.. Plant Soil 120:125-131.
In a greenhouse study, surface soil from long-term experimental spring wheat rotations was amended with 15N labelled legume green manure and subsequently cropped (canola and spring wheat) or incubated. N mineralization from both the indigenous soil N and from green manure was suppressed in cropped soil. Net N mineralization in the uncropped and cropped treatments averaged 73 and 43 mg/kg, respectively. This difference was attributed in part to enhanced biological immobilization in the rhizosphere. These data suggest that short-term N mineralization is favored by fallowing soil after green manure application whereas N retention in organic matter is favored by immediate cropping.
10596. Wardle, D.A. and D. Parkinson. 1990. Influence of the herbicide glyphosate on soil microbial community structure.. Plant Soil 122:29--37.
Four rates of glyphosate were applied to soil at log increments and incubated for 27 days. Bacterial propagule numbers were temporarily enhanced by the two highest rates, while actinomycete and fungal propagule numbers were not changed. The frequency of three fungal species was temporarily enhanced by the highest rate, while one was inhibited. There was little agreement between species responses to glyphosate in incubated soil and in pure culture.