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.
Results
Showing 1 to 20 of 23 for “"leaf nitrogen"”.
-
Seasonal and site relationships to acetylene reduction by actinorhizal black alder and Russian olive root nodules
… soil temperature. Soil moisture content, pH and nitrogen concentration and leaf nitrogen concentration were not correlated with ARA. Soil pH and nitrogen concentration did not change with season. Bottomland soil pH was less under alder than under Russian olive. Alder ARA began about 2 weeks after …
-
Effect of nitrogen fertilization on the physiological damage and subsequent recovery of mite-infested apple leaves
… apple trees to evaluate the effect of nitrogen fertilization on the physiology of apple leaves subjected to European red mite feeding, and the subsequent recovery of leaf function following mite removal. Nitrogen (N) fertilization affected the visual damage, and the photosynthetic …
-
High throughput phenotyping and quantitative genetics of leaf functional traits in C4 grasses
… Phenotyping complex traits such as water and nitrogen use efficiency in genetically diverse populations is currently a bottleneck in crop improvement because it is time and labor intensive. To harness the diversity available to improve crop productivity, high throughput phenotyping (HTP) …
-
Changes in Leaf Area and Nutrient Content of Celtis spp. Across a Precipitation Gradient in Texas
Nitrogen is a key nutrient for cell and protein function in both plants and animals, and the ratio of carbon to nitrogen in leaves is a good indicator of nutrient quality within an ecosystem. Studies have shown that an increase in precipitation increases leaf size and the C/N ratio, but can …
-
The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology
… productivity. Many apple growers apply synthetic nitrogen fertilizers to improve fruit yield and quality. In excess of tree requirements, nitrogen fertilizers may reduce crop yield and quality, as well as contribute to water pollution. The addition of carbon-based amendments, such as yardwaste, …
-
The effect of spirea aphid (Homoptera: aphididae) feeding and nitrogen fertilization on the growth of young apple trees, with comparisons to apple aphid
… aphid, Aphis spiraecola Patch, feeding and nitrogen fertilization on net photosynthesis (Pn), leaf chlorophyll content and greenneess, growth, dry matter accumulation, and carbohydrate concentrations of young apple trees, with comparisons to apple aphid, Aphis pomi DeGeer. Trees were …
-
Aspects of the biology of climbers in southern Africa
… gain capacity (maximum photosynthetic rate, leaf nitrogen concentration and leaf water use efficiency) were compared between climbers and trees. While the climbers had a significantly higher leaf nitrogen concentration than trees, as well as higher leaf water use efficiency; the maximum …
-
Development of Multifunctional Electrical Impedance Spectroscopy System for Characterization in Plant Phenotyping
… the robustness in applications for assessing the leaf nitrogen status, leaf water stress, root growth, and root biomass of the plants, and detecting the plant-like organisms such as algae species by measuring impedances in multiple frequencies. The overall research work is divided into three …
-
Effects of Organic Soil Amendments on Soil Physiochemical and Crop Physiological Properties of Field Grown Corn (Zea mays) and Soybean (Glycine Max)
… soil physiochemical properties, corn and soybean leaf physical and biochemical properties yield and seed quality between organically amended and inorganically fertilized treatments. Nitrogen mineralization rates were greatest in the poultry litter (21%) and Panorama yard waste compost (4.5%) …
-
Foliar Herbivory on Understory Oaks as a Function of Forest Type and Prescribed Burning
Loss of oak seedling and sapling leaf area to insect herbivores has not been well characterized in Ozark forests, but may be a critical variable affecting current and future forest health. This study quantified loss of oak seedling and sapling leaf area to insect herbivores in recently burned or …
-
The effects of neighbor, distance, and organic fertilizer on the establishment and early performance of three woody species in a restoration trial in the Kunene region, Namibia
… organic fertilizer on the growth, survival, and leaf traits of three woody species – Vachellia erioloba, Colophospermum mopane, and Combretum imberbe. Experiments were conducted in outdoor and indoor environments using a "two-factor (2x9) complete randomized factorial design" with nine neighbor …
-
Leaf nutrient draw back as a strategy for tree grass co-existence in the savanna biome
… observing the seasonal variation in carbon and nitrogen concentrations in leaves and young twigs of two deciduous species, Combretum apiculatum and Terminalia sericea. The study was carried out in the sub-tropical savanna biome in southern Kruger National Park, South Africa. Photosynthetic …
-
Coordination of physiological and morphological acclimation of shade-grown tree saplings to late-season canopy gap formation
… them to a naturally occurring canopy gap after leaf development was completed in the shade. A series of experiments with the same basic experimental design was conducted on up to four species of temperate deciduous hardwoods: red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.), tulip …
-
Trading water for carbon in a changing climate: can optimality theory improve the predictability of land surface models?
… in 1) is coupled to a scheme that optimises leaf nitrogen investment, and both approaches are extended to account for system legacies from drought, before being evaluated for their ability to coherently interact with one another. This thesis demonstrates the wide-ranging scope for optimality …
-
High Throughput Phenotypic Evaluation of Drought-related Traits in Soybean
… and drought conditions. Beginning at R5, leaf samples were taken for nitrogen concentration analysis. Pictures were taken across the top of each plot to determine the intensity of greenness using the Dark Green Color Index (DGCI). Aerial photographs were also taken to determine aerial DGCI …
-
Impact of foliar molybdenum application in acutely deficient vineyard on wine quality
… in soils involved in plant growth crucial for nitrogen metabolism. From 2017 to 2020, a 5 percent sodium molybdate solution was foliarly applied on Vitis interspecific hybrid cv. Vignoles vines in commercial production after grapevine health and wine quality problems were reported and diagnosed …
-
Photosynthesis and transpiration in a dry-land Pinus radiata forest
… of photosynthesis and transpiration at the leaf and canopy scales in a dry-land Pinus radiata D. Don forest by combining gas exchange measurements with biophysical process-based models of photosynthesis, radiation transfer, and soil water balance. Responses of photosynthesis to leaf …
-
Effect of Population Sources and Species Pools on Community Phylogenetic and Functional Diversity During Restoration
… had higher functional trait values (especially leaf area and leaf nitrogen content) in comparison to when established with local ecotype sources of the dominant species. In addition, the functional relatedness among subordinate species established with local ecotypes was less (more functionally …
-
Effect of heavy metals on salt march biota
… Plant growth performance assessment based on leaf nitrogen (N) content, stable isotope ratios ([delta]C), carboxylation efficiency (CE), CO_2 saturated photosynthetic capacity (A_{max}), estimations of optimal transfer efficiency of open photosynthesis II (PSII) reaction centers (F_v/F_m), …
-
Influencia del uso de cubiertas vegetales sobre la fertilidad del suelo, la expresión vegetativa de la vid y la composición de la uva y del vino en un viñedo de Tempranillo (Vitis vinifera L.) de la D.O.C. Rioja
… Regarding soil nutrients availability, the nitrogen fixation capacity of the leguminous crop marked a difference and, in fact, the soil nitrogen availability, in its nitrate form, which is the one that the vine assimilates primarily, was higher in the clover crop treatment from the second …
Page 1 of 2