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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 55 for “"C:N ratio"”.
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Biogas production from novel substrates
… application to AD. From literature the ideal C:N ratio is between 25 and 30:1. Low levels of C:N (<15) can lead to problems with ammonia inhibition. Within the digester a plentiful supply of nutrients and a balanced C:N is required for stable performance. Feedstocks were sampled from a range of …
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Ammonia emissions and pathogen inactivation during controlled composting of pig manure
… adjusting the initial carbon to nitrogen (C:N) ration and pH of pig manure and straw mixes on ammonia emissions and pathogen marker inactivation during composting were investigated by experimentation and modelling. Three, 210-litre reactors were designed and built to control conditions, such as …
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Effect of Poultry Litter-Yard Waste Compost Application on Phosphorus Availability in Diverse Soils
… to evaluate effects of pre-compost C:N substrate ratios for poultry litter-yard waste compost (PYC) on the availability of soil P, to determine the P response of corn plants to inorganic P, PL and PYC application, and to study relationships between P availability and both inorganic P and PYC …
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Carbon dioxide emissions from selected soils in Zambia : effects of nitrogenous fertilizer and agricultural lime.
… how they are managed. As atmospheric CO2 concentrations continue to rise there is need to find ways of reducing CO2 emissions from soils. This study was conducted to assess the effects of applying agricultural lime and an NPK fertilizer on CO2 emissions from soils and to identify soil properties …
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Interspecific wood trait variation predicts decreased carbon residence time in changing forests
… wood traits, notably taxon initial wood C:N ratio and Mn concentration, outweighed environmental factors in explaining variation in decay rates. A significant interaction between soil pH and wood Mn, which co-regulate microbial lignin degradation, suggests a similar importance of Mn in …
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Plant Residues and Newspaper Mulch Effects on Weed Emergence And Collard Performance
… biodegradable. However, newspaper has a high C:N ratio which can reduce soil fertility and crop growth. The primary disadvantage of plant residue is the large quantity necessary for adequate weed suppression, but combining newspaper and plant residues may provide adequate weed suppression with …
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A Study on the Simultaneous Nitrification and Denitrification Process of a Membrane Aerated Bioreactor Augmented by BiOWiSH Aqua
… nitrogen is a multi-stage process, expensive, operationally intensive, and requires large land areas. This research studied the effects of BiOWiSH® Aqua (Aqua), a biological enhancement product, on the simultaneous nitrification and denitrification process in a membrane aerated bioreactor (MABR) …
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Heathland Restoration after Mineral Extraction
Restoration Ecology has been developed over the last 40 years in efforts to better understand how to restore, recreate or reclaim land damaged by human activities. Lowland heath is one of the more difficult habitats to recreate due to the complicated interactions of soil chemistry and plant …
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Biofilm development in streams draining from contrasting land use systems.
… the experiment, the carbon to nitrogen ratio of the bio film remained at an average of 10.1. Within the mature forest site the total material increased to 0.83 mg cm-2 in the first two weeks. The total material increased to 1.43 mg cm-2 in week six, however in the eighth week there was a …
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Soil carbon and nitrogen cycle modeling for bioenergy crops
… could be converted into croplands for second generation bioenergy, such as the cultivation of miscanthus and switchgrass. Study on the effect of the expansion of these crops on soil carbon and nitrogen dynamics is integral to understanding their long-term environmental impacts. We developed a …
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Feedback regulation of nitrogenase and response of a hypernodulating soybean mutant to increased photosynthate supply
… using a hydroponic system. A wide range of C:N ratios in various plant tissues was generated through a combination of light, CO$\sb2,$ and N levels, using two soybean genotypes differing in C and N acquisition rates and in tolerance of nodulation to external N. Shoot N concentration was …
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Optimizing Weed Suppression Via Cover Crop and Herbicide Programs in the Mid-Atlantic
… because of its extensive biomass and high C:N ratio. Due to this, farmers are interested in substituting black oat (Avena strigosa S.) for cereal rye. Therefore, we conducted two experiments to compare cover crop characteristics. In corn, cereal rye, cereal rye + hairy vetch, black oats, and …
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Vliv dominantních druhů stromů na půdní vlastnosti
… age is the controlling factor of carbon sequestration. In well-developed soils more C was stored under conifers. In initial soils on post mining sites on the other hand more C was stored under broadleaves. A negative correlation between sequestered C and C:N ratio in leaf litter was found on …
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Deer impact and plant resistance traits
… mass per area, Leaf dry matter content, C:N ratio, and Wood density) were tested and compared between low and high deer density area by using mixed effect statistical models. Leaf mass per area (LMA), leaf carbon-nitrogen ratio (C:N), and wood density did not respond significantly to …
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Legume integration and nutrient management impacts on soil health and cropping system productivity
… challenges in these agricultural systems. Integration of legumes into cropping systems, especially when combined with organic nutrient inputs, holds great promise for supporting soil health. However, legume performance and potential contributions to soil health, likely depend on legume species, …
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Decomposition of Crop Residues
… and field. It also measured the incorporation of crop residue and soil C and N into the microbial biomass. 14C-, 15N-labelled maize residues incorporated and incubated in an aerobic environment, under laboratory conditions, were mineralized to a greater extent in the short term than the …
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Investigation of a Commercial Product (BiOWiSH™) for Nitrogen Management
… an anoxic environment with a carbon-to-nitrogen ratio of 2:1. Under this optimal growth environment, Biowish–Aqua was able to assimilate ammonia with a zero order k value of 3.06 ppm/day. Also, under the same conditions, Biowish–Aqua was able to eliminate nitrate ( ) and nitrite ( ) at a rate of …
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Some aspects of the nitrogen nutrition and growth of Gracilaria gracilis grown by suspended cultivation in Saldanha Bay, South Africa
… of managing this problem. Nitrogen content, C:N ratio and stable isotope abundances of C and N were obtained for material grown for varying lengths of time, material grown at various depths and material that had been fertilized prior to placement on the raft. The relationship between thallus …
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Using Portable X-ray Fluorescence to Predict Physical and Chemical Properties of California Soils
… management practices, optimize agricultural operations, and ensure the continuation of ecosystem services provided by soils. However, current analytical standards for identifying each distinct property are costly and time-consuming. The optimization of laboratory grade technology for wide scale …
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Relationships between invertebrate detritivores and gut bacteria in marine systems
… (assessed by proportion of living component, C:N ratio) and quantity. In terms of distribution ofthe resource, quality was highest in surface sediments, while quality was greatest at burrow linings. The mode of feeding, gut structure and diet of the two prawn species differ, although gut …
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