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 10 of 10 for “"nitrogen accumulation"”.
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Do benefits from cover crops vary by species or mixture composition?
… i.e. increase seeding rates for legumes if nitrogen fixation is a higher priority than weed suppression. The use of cover crops in mixture is becoming increasingly popular in organic farming systems. However, relatively little is known about how diverse species mixtures affect soil nitrogen …
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Influence of nitrogen fertilization and leaf management on nitrogen use efficiency and agronomic performance of mammoth cultivars of flue-cured tobacco
… Virginia to determine the influence of nitrogen rate on nitrogen use efficiency and its components on two mammoth cultivars and a conventional cultivar. Experiments were also conducted to determine the effects of leaf number, time of topping, and nitrogen rate on yield, quality, and …
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Carbon storage in grasslands : the impact of atmospheric nitrogen pollution
Atmospheric nitrogen deposition is a major threat to biodiversity and ecosystem service provision around the globe. It is known that nitrogen enrichment affects various chemical and biological processes involved in carbon cycling and storage in soil. This is especially significant as soil carbon …
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Comparisons of crop yields using semi-organic and inorganic fertilizers
… crop in all experiments.Biomass production and nitrogen accumulation were studied in the field trials.In the field trials a greater stand density was produced using the semi-organic fertilizer as compared with an inorganic fertilizer and no-fertilizer treatment. This difference was evident from …
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Mechanistic aspects of microbial invasion of wood
… used in this investigation, to compounds with a nitrogen component.<br/><br/>Nitrogen contents of soils at IRG test sites were determined and found not to correlate with published decay estimates. It was considered that refinement and standardisation of soil sampling procedures was required in …
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The fate of anthropogenic nitrogen in a redox stratified pond: an isotopic approach
… biogeochemical effects accompanying increased nitrogen pollution. Cape Cod is home to roughly 1,000 ponds and lakes which play an important role in local ecosystems, but the cycling of nitrogen in these waters is not well understood. The goal of this research is to identify the major …
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PHYSIOLOGY AND PERSISTENCE OF ALFALFA WITH CHANGES IN SOIL CHEMISTRY
… on soil chemical changes and on nodulation, nitrogen fixation and yield of alfalfa was investigated.</p><p>In the field, increasing rates of lime improved alfalfa dry matter yield at the Kingman Farm. Optimum dry matter yield was obtained with 3.5 tons lime/ha. A quadratic response curve …
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To Mix or Not to Mix: Performance and Management of Diverse Cover Crop Mixtures
… cash crops to improve soil quality and to supply nitrogen (N) to cash crops through biological N fixation or soil N scavenging. Most producers use single species CC, in part because potential benefits of using mixtures of three or more CC species are poorly understood. A three-year study was …
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Optimizing Cover Crop Integration: Early Establishment Methods and Technological Approaches for Enhanced Biomass and Nitrogen Management in the Mid-Atlantic
… to improve cover crop (CC) establishment and nitrogen (N) uptake in response to the time constraints commonly faced by Mid-Atlantic farmers. The first study examined whether broadcasting CCs at corn harvest—using various incorporation techniques—can reduce nitrate leaching and enhance biomass …
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Physiological aspects of relative changes in nitrogen and plant density stress tolerances over a 38-year period of US maize hybrid introductions
… were known to accumulate more dry matter and nitrogen in the post-silking period, but achieving a more comprehensive knowledge of pre-silking and post-silking dynamics required further understanding of dry matter and nitrogen partitioning in individual organs, as well as their associations …