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 28 for “"rooting depth"”.
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Measuring rooting depth and distribution of grain sorghum for predicting soil moisture depletion and irrigation scheduling
Digitized by Kansas Correctional Industries
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Stable isotope analysis as an indicator of tree and grass rooting depth in a mesic African savanna
… states that trees and grasses root at different depths and subsequently exploit different soil moisture layers. Root samples were extracted from vertical soil profiles in open and under canopy cover and analysed by means of carbon nitrogen isotopes. While δ¹⁵N showed little pattern due to …
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Effects of Temperature, Precipitation, Solar Radiation, and Rooting Depth on Soybean Yield, Seed Protein, Seed Oil, and Leaf Composition
Made available in DSpace on 2014-12-14T14:37:20Z (GMT). No. of bitstreams: 1 7709228.pdf: 5260415 bytes, checksum: 1cab7dfe11f2da2ec57d8b92694a4d2e (MD5) Previous issue date: 1976
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Soil Water Depletion and Water Use Efficiency of Wheat and Pea in Saskatchewan
… overall soil water use efficiency as related to rooting systems and edaphic factors. The benefits of implementing a pea crop into a rotation has been mainly examined in small plot studies conducted on level, well-drained soils in the southwestern region of Saskatchewan in the Brown soil zone. …
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The Heritability of Seedling Stage Drought Resistance in Rape and Its Relationship to Seedling Root Morphology
… and measurements of root dry mass suggest that rooting depth and extent affect seedling stage drought resistance.
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Niche differentiation in savannas : exploring competition-based hypotheses for inter-life form coexistence
… hypothesis, which is based on differences in rooting depth, and the phenological niche separation hypothesis, which is based on differences in timing of resource acquisition. My results show that niche separation along environmental axes on spatial and/or temporal scales, although unlikely to …
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Analysis of Error in a Model Predictive Irrigation Controller
… c), moderately sensitive to the maximum rooting depth (Zᵣ), less sensitive to depletion fraction (f subscript d), and almost completely independent of the the yield response factor (K subscript y). This result is potentially useful for designing calibration procedures for the deployment …
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Modeling of water table profile for a subirrigation system and evaluation of reliability of drainmod for the Lower Fraser Valley
… Valley. Predicted and measured water table depth were compared for 4 years (1985, 1986, 1987 and 1988), where 1986 was a normal year from the total rainfall standpoint. Model simulations of water table depth were closer to the actual value of wet season. The model overestimated water storage …
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Near Real-time Seasonal Drought Forecasting and Retrospective Drought Analysis using Simulated Multi- layer Soil Moisture from Hydrological Models at Sub- Watershed Scales
… 9-months. A combination of the surface and total rooting depth soil moisture percentiles proves to be an effective increment over conventional drought assessment approaches in capturing both, transient and long-term drought impacts. The proposed real-time drought monitoring approach shows high …
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The role of water and nutrient availability in determining above and below ground allocations in a C4 grass Stipagrotis ciliata desf. de Winter
… sites (Zadi= -1.964, p<0.05). Although total rooting depth did not appear to differ between sites, in total more root material was found per plant at the inland site, with 40% of all root material occurring directly below the plant. At the coastal site, a greater proportion of root material …
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Aspects of coastal fynbos phenology
… differences can be explained in terms of species rooting depth and soil water-holding capacity. The second paper investigates patterns of seasonal shoot or culm growth in 11 species, in relation to past and present climatic factors and seasonal nutrient availability. The results show that other …
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Geochemical Investigations of Mineral Weathering: Quantifying Weathering Intensity, Silicate versus Carbonate Contributions, and Soil-Plant Interactions
… in plant physiognomy, life history, and rooting depth. In addition, the proportion of atmospheric dust and bedrock mineral contributions to soil water 87Sr/86Sr ratios varied predictably with landscape age and bedrock lithology. On the Himalayan floodplain, soils and paleosol silicate …
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How Distance from Groundwater Affects the Water Status of Trees at San Marcos Springs
… I conducted a study at a site where the depth of a shallow groundwater table was indicated by the water level of a spring-fed lake and the distance of trees from groundwater was determined by their position on an escarpment above the lake. I tested the hypotheses that trees at higher …
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Cotton Yield as Related to Selected Physical and Chemical Properties of Soils of the Coastal Plain of Virginia and North Carolina
… Plain of Virginia and North Carolina to a depth of 92 cm representing 5 major soil series. Soil samples were analyzed for selected physical and chemical properties from each horizon. Boll and plant counts were obtained while harvesting a 3-meter length of row at each site to determine yield …
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Growth and Physiological Responses to Fertilizer Application in Clonal Loblolly Pine
… was observed in root morphology, and maximum rooting depth showed a significant clone-by-fertilizer interaction. Clones with rapid growth rates can be selected with a range of other desirable traits. Short-term (i.e. weeks) responses to fertilization are often inconsistent with long-term (i.e. …
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Effects of no-tillage and subsoil loosening on soil physical properties and crop performance : a thesis presented in partial fulfilment of the requirements for the degree of Master of Applied Science in Soil Science at Massey University
… criteria were in spite of the vertical rooting depth being greater in the PP treatment. The lack of differences in plant establishment and yield was thought to be due to the relatively dry autumn and winter soil conditions and the use of the Cross-Slot™ no-tillage opener which is …
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Exploring relationships between root architecture and growth of UK wheats (Triticum aestivum L.)
… soils, where water is only available at depth during the grain filling period, growing deep rooting cultivars increased wheat yields by approximately 15%. Seedling root angle is associated with adult root system depth in Australian field-grown wheat cultivars (Triticum aestivum L.), but …
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Roots as agents of soil change over time and as mediators of humanity’s imprint on Earth’s critical zone
… of available C and nutrients, as well as the depth of root exploration. I examine the role of rooting system economies in nutrient availability and C cycling, and the ways those economies are changing as a consequence of anthropogenic activity. In Chapter 1, I characterize rooting systems’ C …
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Site Quality Classification for Mapping Forest Productivity Potential on Mine Soils in the Appalachian Coalfield Region
… to four soil properties (soil density, rooting depth, texture, and pH) most significantly related to the SI of white pine, and the properties were weighted based on their importance to white pine growth on mine soils. The modified PI model produced an R2 of 0.69 for a linear relationship …
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Effects of aspects of terroir on the phenolic composition of New Zealand Pinot noir wines
… by soil parameters (carbon content, potential rooting depth and profile readily available water) and key colour parameters (total anthocyanins, total red pigments, ionised anthocyanins, and malvidin-3-glucoside), while positive correlations with some hydroxybenzoic acids were also found.
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