Index Catalog // ScholarsArchive@OSU

Selecting optimum crop rotation

Creator:: El-Nazer, Talaat Y.
Abstract:: The crop rotation decision is important to farmers because of its impact on profitability, financing and risk exposure. This thesis addresses the problem of farm level crop rotation selection under perfect and imperfect knowledge of prices, yields and costs. The problem is addressed by first estimating production functions for irrigated...
Resource Type:: Dissertation
Full Text:: below. 1. Increased Yieldsz The preceeding crop in a rotation has an important influence on crop

Specification of local surface weather elements from large-scale general circulation model information, with application to agricultural impact assessment

Creator:: Wilks, Daniel S.
Abstract:: A procedure for model-assisted climate impact assessment is developed. The approach combines data from observations and atmospheric general circulation models (GCNs), and provides the basis for a potentially valuable means of using information derived from GCMs for climate impact assessments on local scales. The first component of this procedure is...
Resource Type:: Dissertation
Full Text:: change ( t2X-001]/C1X-001) ) in average simulated crop yields for Box 1. 175 Figure 34. Relative change

Inheritance of resistance in some wheat introductions to selected races of bunt, Tilletia caries (DC) Tul and Tilletia foetida (Wallr) Liro

Creator:: Abdalla, Osman S.
Abstract:: Bunt or stinking smut is a major disease of wheat. In the U.S. common bunt, Tilletia caries (DC) Tul. and T. foetida (Wallr) Liro, is a threat to wheat production in the Pacific Northwest. Screening trials conducted by USDA Cereal Investigations Project in Oregon, from 1955-1980, revealed that a number...
Resource Type:: Dissertation
Full Text:: were made in the crop years as listed. 18 Crosses Crop Year 1-PI 166910 / Elgin 1964-65 2-PI

Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

Creator:: Geddens, Ray M.
Abstract:: Eight postemergence herbicides were evaluated to determine their influence on the incidence and severity of take-all disease caused by the fungus Gaeumannomyces graminis var. tritici in winter wheat. Mecoprop ((+)-2-(4-chloro-2-methylphenoxy)propanoic acid), difenzoquat (1,2- dimethyl- 3,5- diphenyl -1H- pyrazolium), dinoseb amine (amine salt of 2-(1-methylpropy1)-4,6-dinitrophenol), and diclofopmethyl (methyl ester of (+)-2-[4-(2,4-dichlorophenoxy)...
Resource Type:: Dissertation
Full Text:: wheat : alterations in the incidence and severity of disease and crop growth AN ABSTRACT OF THE THESIS

Assessment of resistance and inheritance to Barley Yellow Dwarf Virus disease (BYDV) in five wheat cultivars (Triticum aestivum L.)

Creator:: Tola, Jaime
Abstract:: Barley Yellow Dwarf Virus (BYDV) is a major disease of wheat. Unfortunately, unlike barley where the Yd2 gene provides adequate levels of resistance, the situation in wheat is more complex. This study was designed to provide information regarding: 1) evaluation of methods of measuring resistance among selected cultivars; 2) identification...
Resource Type:: Dissertation
Full Text:: Tole for the degree of Doctor of Philosophy in Crop Science presented on May 11, 1983 Title

Identification and development of cultural practices for upland rice production systems for savanna soils of Colombia

Creator:: Leal-M, Dario
Abstract:: A great potential for increasing upland rice production exists in the savanna soils of Colombia. These vast areas are currently underutilized. However, they have good soil structure, flat topography, coupled with sufficient and well distributed rainfall, making savanna soils ideal for upland rice cropping system. The major constraints to upland...
Resource Type:: Dissertation
Full Text:: chemical inputs. Key technology components must include: 1) the identification of suitable crop species

A framework for the determination of the suitability of undeveloped land in the intermountain west for use as cropland

Creator:: Rathburn, Arthur Cristen
Abstract:: The "Framework for Determining the Suitability of Undeveloped Land for Use as Cropland" is a decision-making format to assist private and governmental agency decision makers in categorizing undeveloped lands, which have been identified as having potential for conversion to cropland, as to their suitability for use as cropland. The Framework...
Resource Type:: Dissertation
Full Text:: lands are those lands with little or no particular limitations for irrigated agriculture. Class 1 lands

Inheritance of Septoria leaf blotch resistance and the possible influence of heading date and plant height on the disease expression in a winter wheat cross

Creator:: Camacho Casas, Miguel Alfonso
Abstract:: Parental lines, Fi's and segregating populations (F₂, F₃ and BC's) including reciprocals were evaluated under field conditions to determine if genetic resistance per se exists for Septoria Leaf Blotch in a selected winter wheat cross. The experiment was conducted over a three year period with both natural infection and artificial...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE THESIS OF Miguel Alfonso Camacho-Casas for the degree of Doctor of Philosophy in Crop

Models of a four-species annual weed community : growth, competition, and community dynamics

Creator:: Roush, Mary Lynn
Abstract:: Models of weed communities aid in the development of weed management strategies and elucidate the processes and mechanisms that regulate plant populations and communities. A conceptual weed community model was developed to organize key regulatory life-history processes. Specific investigations focused on the processes of plant growth and competition, and relationships...
Resource Type:: Dissertation
Full Text:: : Literature Review. V page 1 5 Chapter I. MEASURING COMPETITION IN WEED-CROP ASSOCIATIONS: INTENSITY OF

An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

Creator:: Diop, Amadou Makhtar
Abstract:: Field, screenhouse, and laboratory experiments were conducted to study weed interference in rice grown on hydromorphic soils at the International Institute of Tropical Agriculture (IITA) at Ibadan, Nigeria. Rice and weeds emerged at the same time, 1 week after planting. Weed dry weight was significantly reduced when the crop was...
Resource Type:: Dissertation
Full Text:: REVIEW 1 INTRODUCTION 1 LITERATURE REVIEW 5 Crop-weed interactions 5 Interference: Allelopathy and

ScholarsArchive@OSU

Selecting optimum crop rotation

Specification of local surface weather elements from large-scale general circulation model information, with application to agricultural impact assessment

Inheritance of resistance in some wheat introductions to selected races of bunt, Tilletia caries (DC) Tul and Tilletia foetida (Wallr) Liro

Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

Assessment of resistance and inheritance to Barley Yellow Dwarf Virus disease (BYDV) in five wheat cultivars (Triticum aestivum L.)

Identification and development of cultural practices for upland rice production systems for savanna soils of Colombia

A framework for the determination of the suitability of undeveloped land in the intermountain west for use as cropland

Inheritance of Septoria leaf blotch resistance and the possible influence of heading date and plant height on the disease expression in a winter wheat cross

Models of a four-species annual weed community : growth, competition, and community dynamics

An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

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