Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Soil biology"”.
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Managing scientific change in agricultural policies: soil productivity, resource conservation and the legitimation of agrobiology
… conditions presiding over conceptual changes in soil sciences in Québec since 1960, and the legitimation of research in agrobiology. At the beginning of the seventies, researchers in soil sciences opted for a physico-chemical interpretation of soil fertility phenomena and for a scientific …
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Nitrogen Management and the Effects of Compost Tea on Organic Irish Potato and Sweet Corn
… of plant-available nitrogen (N) to the soil is a major challenge for organic farmers, especially when growing crops in soils that are in transition from conventional to organic systems. This research evaluated the effects of site produced cover crops and application of soil amendments on …
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Integrating basic remote sensing, terrain analysis and geostatistical methods to generate spatially explicate continuous soil attribute maps for Fraser Experimental Forest
Hans Jenny's Factors of Soil Formation, a system of quantitative pedology (1941), concisely summarized and illustrated many of the basic principles of pedology utilized to date (Jenny, 1941). This state factor model became the backbone for soil survey research and production because it proposed …
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Atributos físicos e biológicos do solo sob diferentes condições de uso nas várzeas de Sousa (PB)
Changes in the soil are capable of modifying the natural functioning of the soil. This makes it a constant necessity to monitor the impacts of different types of use. Thus, the objective of this study was to evaluate biological and physical attributes of the soil under different usage conditions in …
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Maximising the benefits of cover crops through optimising the use of rotations, nitrogen fertiliser and organic manures
… fallow. Cover crops sequester nutrients, protect soil from the elements through mitigation of excess rainfall, enhance crop diversity and can positively impact soil health. This project investigates if the practice of integrating cover crops in arable rotations can improve spring barley yields …
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Assessing the role of probiotics for the enhancement of soil quality under cover crops
… in some negative impacts on the environment and soil microbial biodiversity. Use of alternative management such as application of probiotics for soil and plants is a believed to promote soil biodiversity and soil nutrient cycling. Probiotics are believed to improve plant growth, root development …
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Some physical, chemical, and biological effects of heavy poultry manure applications on a soil ecosystem
… MT/ha/yr to field plots of Davidson clay loam soil in Virginia. Both fertilized and unfertilized control plots were included and maize was grown on all plots. After 5 years, changes in the soil were investigated, primarily in the upper 36 cm. The heavily manured plots held more moisture, …
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Ecological assessments of Pseudomonas communities in pastoral soils: implications for disease suppression and sustainable production in agricultural grasslands
… services such as ensuring water quality and soil carbon storage. An increasing proportion of grasslands are being used to support grazing livestock, with agricultural grasslands covering over 25% of the Earth’s ice-free land surface. Despite the increasing economic value of pasture-derived …
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Propriétés fonctionnelles du charbon de bois en fonction de la sévérité des feux de forêt
… scientifique, soumis à la revue scientifique Soil Biology and Biochemistry. L'expérience cible l'effet de la température de production du charbon de bois sur le cycle du carbone (C) et de l'azote (N) dans un sol forestier. Un sol forestier à done été amendé avec des charbons de bois d'épinette …
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Subterranean ant nest architecture and its variation between species and environment
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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The relationship between invasive annual grasses and biological soil crust across Eastern Washington
… component of invasion resistance is biological soil crust (biocrust), which has been shown to limit Bromus tectorum (cheatgrass) in arid regions. However, biocrust has been less studied in semiarid regions and its effects on other invasive annual grasses, such as Ventenata dubia, have never been …
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Diversity of Free-living Nitrogen Fixing Bacteria in the Badlands of South Dakota
… was to isolate free-living diazotrophs from the soil crusts of sod tables of South Dakota Badlands. Samples were obtained from sod tables and the surrounding base (matrix) in spring and fall of 2014. A culture dependent approach was used to isolate diazotrophs on solid nitrogen free medium (NMF) …
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Studies on the microbial ecology of soils from Pinus radiata (D. Don) forests
… the problem. Work was started on a study of the soil sequence across the Moutere Gravels to determine if there was a general decline in fertility of tho soil with the age of the soil and the environmental factors, such as climate which differs in the high inland areas and the low seaside areas of …
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