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 34 for “"Plant Nutrient"”.
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The time and rate of plant nutrient absorption by bright tobacco
In the production of most farm crops, emphasis is placed on yield per acre. Other things being equal, the higher the yield er acre the lower the per unit cost of production. But in the case of flue-cured tobacco, emphasis is placed primarily on quality. Yield per acre is, of course important, but …
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Effects of Land Disposal of Pulp Mill Effluents on Plant Nutrient Uptake and Element Balance
<p>An analysis of the soil and plant tissues was undertaken to ascertain the effect that land irrigation with pulp mill effluent has on nutrient uptake and element balance of tree seedlings. Results show that the effluent significantly increased the sodium content of both soil and tissue; however, …
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Impacts of Invasive Asian Jumping Worms on Soil Properties in Turfgrass Systems and their effects on Plant Nutrient Acquisition and Physiological Responses in Greenhouse Experiments
… mid-sized aggregates (0.25–2 mm) decreased. Soil nutrients remained largely stable, though phosphorus and organic matter showed seasonally dependent shifts linked to jumping worm presence. Firth logistic regression identified organic matter as a significant predictor of jumping worm detection, …
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Corn tissue nutrient response related to soil health and fertility
Nutrient uptake in corn (Zea mays L.) is influenced by many different factors which include properties of soil health. The push for increasing soil health has raised the question of how soil health and fertility measurements could be combined to improve nutrient management decisions. Attention to …
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The use of rockdust and composted materials as soil fertility amendments
… to investigate the impact these materials had on plant yield, plant nutrient content, soil chemistry and soil microbial communities in direct comparison with chemical fertilizer and farmyard manure. There were annual applications of compost, manure and chemical fertilizer in spring with one …
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The effects of fertilisers, particularly foliar applied, on the potato plant's tolerance of attack by the potato cystnematodes, <i>Globodera rostochiensis</i> and <i>G. pallida</i>
… cited is a reduction in the uptake of the major nutrients nitrogen (N), phosphorus (P) and potassium (K). For the work described in this thesis, it was hypothesised that nutrient application via the foliar route could by-pass the PCN-damaged plant root system, ameliorate the PCN-induced nutrient …
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Characterization and agronomic evaluation of biochar amendments in a midwestern loam soil: effects on soybean yield, soil nutrient retention, and leachate quality
… results for improving soil fertility, enhancing nutrient retention, and mitigating environmental degradation in agroecosystems. This dissertation investigates the physicochemical properties of biochar derived from different feedstocks and thermochemical processes, and evaluates their short-term …
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Understanding key factors influencing habitat quality for the endangered fountain darter (Etheostoma fonticola) in the Comal River.
… place in Landa Lake: water column, sediment, and plant nutrient analyses, an herbivory and soil fertility experiment, and a spatial study of diel dissolved oxygen dynamics. Nutrient data were collected via water samples, nutrient diffusing substrata (NDS), sediment cores, and plant samples. The …
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The effect of oily waste and nutrient amendments on soil fertility and oat growth
… from heavy oil upgrader affects soil fertility, plant growth and microbial activity under controlled environmental conditions. The growth chamber study examined the effect of adding oily waste alone and in combination with fertilizer and hog manure on: 1) soil macronutrient supply 2) growth and …
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The long-term effect of elevated CO₂ on grassland biomass production
… (C₄) and dicotyledenous (C₃) above ground plant biomass production and their dominance patterns along a CO₂ gradient were studied. Three 7x7m plots were located 18m, 39m and 73m away from the elevated CO₂ spring. The 18m site was the experimental site, while the other two sites were the …
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Comparing plant yield and composition with soil properties using classical and geostatistical techniques
Plant nutrient management plays a vital role in the success or failure of modern Lucerne production. In South Africa, Lucerne is produced under a wide range of climatic conditions, under dryland and irrigation and in some areas throughout the year. This means that there is a continuous demand for …
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Phosphorus adsorption on sandy mine tailings: a comparison of treatments with fertilizers, wood ash, and compost
… mine tailings. Since P is usually a limiting plant nutrient, proper P fertilization is essential for continued agricultural productivity. Seven different soil systems including unamended tailings (UT), a series of 5 treatments with fertilizers, wood ash, and increasing rates of compost …
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Soybean Yield and Plant Response to Phosphorus Fertilization
<p>Phosphorus (P) is a key limiting nutrient for soybean production in South Dakota. Soil tests have been used as a baseline indicator for plant available P and fertilizer recommendations for over a century. Plant nutrient analysis may be used to complement a soil test as a way to validate …
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Integrating the effects of climate change and caribou herbivory on vegetation community structure in low Arctic tundra
… its effects on permafrost degradation and nutrient cycling, and to cause positive feedbacks to global climate change through its impacts on carbon balance and albedo. Experimental evidence indicates that tundra plant growth is most strongly limited by soil nutrient availability, which is …
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A Mesocosm Study of Bioretention Functionality Under Frozen Conditions
… was seen following the midwinter melt event. Nutrient performance was comparable between frozen and unfrozen conditions, with most cells leaching relatively low concentrations of nutrients. Nutrient removal was largely dependent on media type, but plant nutrient uptake also appeared to play an …
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Molecular Basis of Calcicole-Calcifuge Physiology.
Calcium (Ca2+) is an essential plant nutrient that plays a key role in plant growth and development and an essential second messenger that controls a variety of cellular functions. It also plays a role in cellular regulation of plant cell signaling. Plants rely on the unique properties of Ca2+ for …
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Effects of arbuscular-mycorrhizal fungal colonization on management of saline lands
… of arbuscular-mycorrhizal ( AM ) colonization of plants in management of saline lands. Some aspects of application of AM fungi in revegetation of saline lands are also reported. Effects of AM pre-inoculation on mycorrhiza-responsive and non-responsive plant growth and establishment were evaluated …
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Liverwort-Fungal Associations: Novel Symbioses In Polar Regions?
Symbioses between plants and fungi are ubiquitous in terrestrial ecosystems, in which they play key roles in plant nutrient acquisition and the cycling of elements. The plant host provides carbon fixed in photosynthesis to the fungi, which in return provide the host with limiting nutrients such as …
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