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 22 for “"planting density"”.
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Response to planting density for corn hybrids grown under narrow and conventional row spacing
… narrower rows tended to yield more at higher planting densities (> 99,000 plants ha-1), and tended to yield less in lower than optimum planting densities (< 76,000 plant ha-1). Differential hybrid responses to row spacing and planting density were also observed with some hybrids producing …
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Modeling maximum size-density relationships of loblolly pine (Pinus taeda L.) plantations
… quantifies the reduction in tree numbers due to density-dependent mortality. Maximum size-density relationships (MSDRs) are a component of self-thinning that describe the maximum tree density per unit area obtainable for a given average tree size, often quadratic mean diameter (D). An MSDR …
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Estimation and Determination of Carrying Capacity in Loblolly Pine
… to obtain BA estimates implied by maximum size-density relationships (MSDRs), denoted implied maximum stand BA. The efficacy of three diameter-based MSDR measures: Reineke's self-thinning rule, competition-density rule and Nilson's sparsity index, were evaluated. Estimates from three MSDR …
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Diameter Distributions of Juvenile Stands of Loblolly Pine (Pinus taeda L.) with Different Planting Densities
… loblolly pine (Pinus taeda L.) with different planting densities were characterized utilizing a two-parameter Weibull distribution. Trend analysis was employed to describe the effects of planting density, age, relative spacing, and rectangularity on the estimated diameter distributions for …
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Basal Area Growth and Crown Dynamics in a Loblolly Pine Spacing Trial
… was found to be inversely related to both planting density and site index. Crown closure was advanced on sites of relatively high quality, exhibiting an approximately linear increase with time from planting until the age of basal area culmination. The slope of this trend increased with …
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The Influence of Stand Density on Rate of Carbon Sequestration in Loblolly Pine Plantations on Mined Lands in East Texas
… This study determined the financially optimal planting density and management regimes for loblolly pine (Pinus taeda) planted on reclaimed mined lands and NIPF lands in East Texas given the objectives of maximizing revenue from timber production and the combination of timber production and …
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Miscanthus X Giganteus Production: Meta-Analysis, Field Study and Mathematical Modeling
… only revealed the effects of the growing season, planting density and nitrogen (N) fertilizer but also provided a measure of uncertainty about these effects. More importantly, it provided statistical models which are essentially testable hypotheses. These models were used in Chapter 2 to predict …
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Quantifying soil reinforcement by fibrous roots
… shear reinforcement, this was tested by altering planting density in both glasshouse and field experiments using one barley variety. After 5 weeks in the field, planting density was related to both reinforcement and root area ratio (RAR), with a 6.7 ?1.40 kPa, or 190%, increase in shear strength …
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Economic comparisons of thinning from above and below in Loblolly Pine plantations using dynamic programming
… 25 years), fixed and variable thinning costs, planting density (440, 680 and 910 trees per acre), stumpage prices and thinning type. Given the same assumptions, thinning from below consistently provided the higher net present value for the optimal regime than thinning from above. For the …
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Establishment of ecological functions in transplanted meadows of the seagrass Posidonia australis
… Western Australia, and to determine how transplanting factors (e.g. planting density, patch size and patch shape) may influence these processes. The study has also determined whether monitoring the return of structural variables of seagrass represents the establishment of ecological functions, …
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Modeling the biomass partitioning of loblolly pine grown in a miniature-scale plantation
… this study determined the effect of initial planting density on the biomass partitioning of loblolly pine. An analysis of covariance concluded that density did not have a significant effect on the relative amount of biomass in aboveground components.Some measures of partitioning tradeoffs …
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Agricultural Buffer Criteria for the City of Arroyo Grande
… buffer specifications such as plant palette and planting density which will be incorporated by reference into the City of Arroyo Grande Municipal Code.
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Transformation of Carbon, Nitrogen and Phosphorus in Deep Row Biosolids Incorporation-Hybrid Poplar Plantation in Coastal Plain Mined Land Reclamation Sites
… 71±12 kg N ha⁻¹, and 11.0±1.8 kg P ha⁻¹. The planting density capable of the N uptake in order to avoid N leaching was estimated at 3912 to 11363 trees ha⁻¹. Our results suggest increased hybrid poplar planting density and decreased application rates of DRI biosolids may decrease the risk of …
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Use of strigolactone for stress relief and increased productivity in high-yielding environments
… Hybrids in this study were evaluated at planting densities of 79,000, 88,000, and 108,600 plants ha-1. In no instance, when averaged over locations, management level, or hybrid, did strigolactone treatments significantly increase grain yield. However, foliar applications of AB-01 resulted …
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Economic Viability of Woody Bioenergy Cropping for Surface Mine Reclamation
Planting woody biomass for energy production can be used as a mine reclamation procedure to satisfy the Surface Mining Control and Reclamation Act of 1977 (SMCRA) and provide renewable energy for the United States. This study examines the economic viability of bioenergy production on previously …
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Management intensity effects on growth and physiological responses of loblolly pine varieties and families growing in the Virginia Piedmont and North Carolina Coastal Plain of the United States
… intensities (operational vs intensive), and planting density (617, 1235 and 1852 trees per hectare). Data were collected during the first four growing season after establishment. At NC, intensive silviculture increased crown-width, height and dbh by 33%, 14%, and 23%, respectively. At VA, …
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Decarbonization strategies for North American urban landscapes: Evaluating pavements and vegetation across design typologies
… The detailed findings highlight the influence of planting density, maintenance regimes, and land cover composition. By structuring assessment around land covers and urban typologies, this thesis delivers a transferable carbon accounting framework aligned with design practice, offering actionable …
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A diallel study of flowering and of ear components of yield in Corn Belt maize and their interactions with population density
… planted in three replications with population density treatments of 39,536, 49,420, 59,304, and 69,188 pl/ha in strips across hybrid treatments. Analyses of variance and combining ability analyses were performed on traits measuring the timing of anthesis (pollen shed) and silk emergence, on ear …
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The Effects of Mechanical Site Preparation Treatment and Species Selection on Survival and Carbon Pools in 12-Year-Old American Sycamore (<i>Platanus occidentalis</i>) and Willow Oak (<i>Quercus phellos</i>) Riparian Plantations in the Southeastern U.S. Piedmont
… not well suited to the wetland sites, inadequate planting densities, soil compaction associated with former agricultural activities, lack of microtopographic relief that allow small seedling to survive on wet sites, competition by herbaceous plants, and browse. Selection of well-suited species, …
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Phenotypic plasticity in soybeans (glycine max (l.) merrill) associated with plant density and phenological stage at thinning
… exposed to either supra or sub optimal plant density stress. However, it is not known whether determinate and indeterminate varieties respond the same and at what phenological stage a soybean plant is able to exhibit adaptive plasticity or elasticity response after thinning. The relationship …
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