Browsing by Department "Agronomy"
Voici les éléments 1-20 de 79
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A comparison of the performance and perceptions of students receiving live versus web-based horticultural instruction
(Texas Tech University, 2003-12)The primary purpose of this dissertation was to examine whether the level of student learning in horticulture was equivalent in both web-based and traditional live instruction and to compare perceptions of students towards ... -
A genetic and mineralogical study of two soils from the Davis Mountain Region, Texas
(Texas Tech University, 1968-06)The primary purpose of this study was to acquire information concerning the genesis of two soils developed from volcanic materials. Secondary objectives were to establish modal profiles for use in classification of the soils. -
A mineralogical investigation of the Castell soil clay
(Texas Tech University, 1966-08)The purpose of this investigation was to acquire more information about the clay mineralogy of a soil (tentatively named Castell) developed in the Central Basin Land Resource Area of Texas on Valley Springs gneiss. Stahnke ... -
A study of clays from the lower part of a soil developed on tertiary basalt in south-eastern Colorado
(Texas Tech University, 1961-05)Not available -
A study of mineral transformations and weathering processes occurring during the genesis of two soils developed from gneiss and schist in Llano County, Texas
(Texas Tech University, 1965-05)Llano County is located in Central Texas and has an area of 942 square miles. In 1960 it had a population of 5,240. The altitude of Llano County ranges from 800 to 2000 feet. The average annual rainfall of the county is ... -
Accumulation of nitrogen, phosphorus, potassium, and calcium in cotton plants grown on Pullman Clay loam soil
(Texas Tech University, 1956-05)Not available -
Adaptation of forage bermudagrasses [Cynodon dactylon (L.) Pers.] to the Texas High Plains grown under saline and limited irrigation conditions
(Texas Tech University, 2004-08)Information is limited concerning adaptation of forage bermudagrasses [Cynodon dactylon (L.) Pers.] to the Texas High Plains. Due to increasing scarcity of Ogallala Aquifer water and increased use of secondary water sources ... -
An evaluation of four native grasses and their competitive effects on cotton
(Texas Tech University, 1967-06)Not available -
Analysis of glutathione S-transferase (GST) gene expression in transgenic plants and its effects on environmental stress
(Texas Tech University, 1998-08)Plants cannot escape from biotic and abiotic stress factors such as extreme temperatures, high light intensity, drought, UV radiation, heavy metals, and pathogen attack. Anthropogenous stress factors, such as herbicides, ... -
Analysis of transgenic tobacco that express maize catalase3
(Texas Tech University, 1999-05)Catalases (H2O2: H2O2 oxidoreductase, EC 1.11.1.6; CAT) are hemecontaining tetramers that are important in destroying H2O2 found in different cellular compartments. Maize Cats has been shown to be capable of dismutating ... -
Antisense-mediated resistance to Agrobacterium vitis
(Texas Tech University, 1998-12)Agrobacterium vitis is the causal organism of crown gall in grapevine. Infection is particularly severe in areas that experience winter damage to the vine. Improving resistance to A. vitis will require a detailed knowledge ... -
Biomass and photosynthetic efficiency of Allium species grown in elevated carbon dioxide levels, with differing plant densities and harvest schemes
(2009)This research evaluated the effect of carbon dioxide (CO2) level, plant density, Allium species phenology, and harvest scheme on edible biomass of green salad onions. The ontogeny of A. fistulosum, A. cepa, and A. ... -
Central cell incongruity as a barrier to introgression in (Allium cepa L. x A. fistulosum L.) x A. cepa backcross F1BC3 generations
(Texas Tech University, 2001-08)Polyacrylamide gel electrophoresis (PAGE) was used to study the inheritance of esterase isozyme (EST) phenotypes in Allium fistulosum L. Three A. fistulosum specific loci were identified from the most anodal zones of ... -
Comparative effects of systemic insecticides on cotton and associated arthropod populations under dryland and irrigated regimes
(Texas Tech University, 1991-12)Field studies were conducted in 1989 and 1990 to evaluate the effect(s) of systemic insecticides (Temik 15G®, aldicarb; Thimet 20G®, phorate, and Furadan 15G®, carbofuran) on cotton, and its associated arthropod fauna under ... -
A comparison of two cottonseed delinting methods with respect to planting seed quality
(1992-05)Not Available -
Competencies for a U.S. horticulture undergraduate major: A national delphi-study
(Texas Tech University, 2007-05)Competency-based curriculum involves defining set knowledge, skills and values for a particular education. Many technical undergraduate majors have developed a list of competencies for evaluation, assessment, and improvement ... -
Corn aerodynamic and canopy surface resistances and their role in sprinkler irrigation efficiency
(Texas Tech University, 1992-05)The development of improved methods for estimating evapotranspiration (ET) rates is important to efficient utilization of declining water supplies. This study was conducted to evaluate commonly used procedures for determining ... -
Cotton (Gossypium hirsutum l.) plant water status as a function of soil water supply and evaporative demand in a semiarid environment
(Texas Tech University, 1992-08)The Southern High Plains of Texas (SHPT) representing a major cotton iGossypium hirsutum L.) growing area of the United States and the world is characterized as a semiarid environment with inadequate rainfall to meet the ... -
Cotton and grain sorghum response to drift rates of glyphosate
(Texas Tech University, 2004-08)Not available