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Showing 1 to 17 of 17 for “"root distribution"”.
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Root distribution of polynomials and distance sums on the unit circle
… further such polynomials. We also analyze the distribution of zeros of certain families of self-inversive polynomials and evaluate their discriminants. Our second topic is the sum of distances between points on the unit circle. We consider the sums over the vertices of the regular $N$-gon with …
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Discriminants: calculation, properties, and connection to the root distribution of polynomials with rational generating functions
… and their q-analogues relate to the root distribution of polynomials. This topic includes the connections between the root distribution of a sequence of polynomials and the discriminant of the denominator of its generating function. A more specialized aspect of this area of this …
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The Effect of Root Distribution on Water and Nutrient Uptake by Soybean Plants Grown in Soil Columns
Made available in DSpace on 2014-12-10T17:12:45Z (GMT). No. of bitstreams: 1 7000957.pdf: 4014119 bytes, checksum: 499301b9285bf68defa93f43a2a51cf8 (MD5) Previous issue date: 1969
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The combined effects of fertilization and relative water limitation on tissue water relations, hydraulic parameters and shallow root distribution in loblolly pine (Pinus taeda L.)
… Our characterizations of the responses of root distribution and hydraulics to limited soil moisture here complement existing research, which demonstrated changes to root distribution and hydraulics in response to fertilization. The responses we discovered in fertilized trees that …
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Rivalry for nutrient resources : is there competition below ground between leguminous trees and grasses in a mesic and arid savanna in the Kruger National Park?
… in savannas. This study describes the fine root-distribution of dominant leguminous C₃ trees and C₄ grasses relative to soil nitrogen, phosphorus and water profiles using stable carbon and nitrogen isotope ratios (of the fine roots). The study occurs on a mesic savanna (737 mm MAP) site on …
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Anhydrous ammonia in vegetable cropping
… 1967). This work is followed by a study of root distribution using 32P and the uptake on anhydrous ammonia. A field experiment was set up using a large field applicator to evaluate the optimum period between application and spring sowing. Field and glasshouse pot trials on two soil types, …
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Rehabilitation of Severely Compacted Urban Soil to Improve Tree Establishment and Growth
… Q. bicolor photosynthesis rates. Greater root presence was observed in deeper soil layers of ET and PR treatments for A. rubrum and of UN and PR for Q. bicolor; root distribution was not measured for other species. Rehabilitation improved soil physical properties and tree growth after two …
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TREE ROOT ENCROACHMENT ON LEVEE DRAINAGE SYSTEM
… of this study were to estimate the influence of roots on the drainage facilities associated with the levees along the middle Rio Grande (MRG), and to suggest an appropriate drainage design. This study consists of three research elements: (1) GIS-based analysis in estimating root distribution …
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Effects of Elevated Atmospheric CO2 on Root Growth, Turnover and Decomposition in a Scrub Oak Ecosystem
… function are not well understood. Measurement of root growth response to elevated atmospheric carbon dioxide is critical to understanding soil carbon input. I investigated the effects of elevated carbon dioxide on fine root growth and decomposition using open top chambers with both ambient and …
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Growth and Physiology of Several Urban Tree Species in Soils Disturbed by Construction Fill or Compaction
… control, fill (20 cm of subsoil spread over the root zones), and compacted fill (same as fill soil, but compacted). Additionally, individual trees had tree wells (fill soil pulled away from trunks), or not. After three years, treatments had no consistent effect on tree growth, chlorophyll …
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Nutrient Foraging in Ten Southeast Coastal Plain Plant Species
Plant root system response to nutrient heterogeneity was tested in ten plant species of varying life form and successional status. All plants tested are native to the South Carolina coastal plain. Morphological responses of the root system (scale, precision and discrimination) and overall plant …
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The potential implications of bioenergy crop production for water and energy balance and carbon and nitrogen dynamics in the United States
… and nitrogen allocation between leaf, stem, and roots/rhizome, vegetation structure development (leaf area, canopy height and root depth and distribution), crop-specific N cycling (such as biological N fixation by Miscanthus, spring and winter N translocation for bioenergy grasses etc.), and …
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Growth and water use of the potato variety Record on contrasting sites
… Water uptake was related to depth and density of rooting, and date of planting and irrigation regime had considerable effects on root distribution. There were interaction effects between site and season on crisp fry colour. Delayed harvest resulted in darker crisps, but fry colour after long-term …
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Soil Organic Nitrogen - Investigation of Soil Amino Acids and Proteinaceous Compounds
… part of this study, the bioavailability and distribution of amino acids, (building block of proteins/peptides), were investigated, in soils across the North-South and West-East transects of continental United States. The second part of this study aimed to understand the variations of organic …
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Strip-till and no-till soybean growth and distribution of roots and soil phosphorus, potassium, and water with broadcast and subsurface-band fertilization
… placement on soybean [Glycine max (L.) Merr.] root distribution, shoot growth and nutrient accumulation, seed yield and seed composition; and to quantify treatment effects on the distribution of P, K, and water in the soil. A three-year field experiment was conducted in Champaign, Illinois on …
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Coordinated Tree Responses to Drought -Vulnerability and Sustainable Production: Hypotheses on Arid Ecosystem Adjustments to Limitations in Water Resources
… greenhouse. Also examined in the greenhouse were root biomass, root structure as well as whole plant biomass accumulation. A second set of experiments was carried out in the greenhouse by subjecting plants initially stressed and non-stressed to severe water stress by withholding water until plants …
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Chebyshev-like polynomials, conic distribution of roots, and continued fractions
… show that a wide range of the properties of the roots of translated Chebyshev polynomials of the first kind (call these complex numbers Chebyshev points), are illuminated by the study of geometric properties of the ellipse and conversely. This includes the following; Chebyshev points lie on …