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 12 of 12 for “"mineral nitrogen"”.
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The nitrogen nutrition of maize on dryland soils of the central Orange Free State
… Orange Free State soils vary considerably in the nitrogen supply to dryland maize. In some localities the soil supplies adequate amounts of nitrogen so that nitrogen fertilizer does not lead to any growth response. In other localities soils are poor in nitrogen and require nitrogen fertilizer for …
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An investigation of the limited distribution of the grazing lawns in Hluhluwe-Umfolozi Park, South Africa
… species. It was hypothesized that a shortage of mineral nitrogen (N) and / or water are key processes excluding grazing lawn grasses in these environments. In areas of highest rainfall grazing lawns do not form, even where grass communities have been heavily grazed for a year or more. It was …
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Nutrient Cycling Between Litters and Soil after Fire in Native Woodland and Pinus radiata Plantations
… of thermal alteration of pine needles on soil nitrogen cycling and the soil microbial biomass. The materials for this work were generated from forestry reserves that had recently been exposed to an uncontrolled fire. These reserves included Eucalyptus woodlands (‘native’) and Pinus radiata …
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Nitrous Oxide Production in Agricultural Soil – Linking Biogeochemical Pathways and Drivers
… relative contribution of NH4+, NO3- and organic nitrogen (Norg) to N2O emission highlights the influence of site-specific factors apart from the field management. Without fertilizer, Norg was the dominant N2O source related to high carbon (C) contents and C:N ratios. High N2O emissions were …
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Cropping systems under water-limited conditions: effects of rotation and nitrogen management on yield, resource use efficiency, profitability, and soil properties
… rotation diversity, cover crop integration, and nitrogen management strategies influence productivity, water-use efficiency (WUE), nitrogen-use efficiency (NUE), soil properties, and economic performance. A long-term field experiment conducted from 2014 to 2024 under limited irrigation in …
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Elaboration d’un modèle d’écobilan de l’exploitation agricole irriguée. Cas du périmètre du Tadla – Maroc
… by using waters of sometimes very degraded mineral quality, on one hand, and the agricultural intensification essentially marked by the application of excessive nitrogenous fertilizers doses, on the other hand, engendered a strong nitric pollution of groundwater table and a spectacular …
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Functional genomics of nodulins in the model legume Lotus japonicus
… under symbiotic conditions in the absence of mineral nitrogen. The nodules of these plants were arrested in growth 14 post inoculation and lacked the characteristic pinkish colour. Growing these transgenic plants in conditions where reduced nitrogen is available for the plant led to normal …
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Modelling New Zealand dairy farm systems to design greenhouse gas mitigation strategies
… by reducing any combination of stocking rate, nitrogen fertiliser and supplement use, was a key strategy in reducing GHG emissions in an economic manner across the whole range of farming systems and regions considered in this study, as well as for all levels of emissions constraints tested. The …
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Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach
… Orchidaceae and Pyroleae gain organic carbon and nitrogen from their fungal partners in addition to the carbon obtained through photosynthesis and the mineral nitrogen assimilated from the soil. Plants exhibiting this mixed nutritional mode have been referred to as being partially …
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Data-driven spatial modeling of historic and future land change at global scale
… (e.g. LULCC datasets, model processes e.g. nitrogen cycle, environmental factors such as climate) in estimating historic and future LULCC emissions, and (4) explore statistical techniques to model future LULCC that takes into account the uncertainties in quantifying the spatial and temporal …
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Studies on the microbial ecology of soils from Pinus radiata (D. Don) forests
… cause o£ the decline was a deficiency of nitrogen highlighted by the low levels of nitrogen in the leaves of the second crop trees, especially those growing on ridge sites. Numerous field trials have been laid out but many of the trials were poorly designed and consequently could not …
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Soil chemistry and ecology on a restoration trajectory of a coastal sandplain forest, Punakaiki, New Zealand
… to change soil chemical properties, including nitrogen (N) dynamics. It was found that two native species, Kunzea robusta and Olearia paniculata, may have the potential to ameliorate concerns associated with nitrate leaching and nitrous oxide production. Restored vegetation at the study site …