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Now showing items 11-20 of 222
Islands in the desert : an environmental interpretation of the Rocky Mountain frontier
(1978)
As a cultural phenomenon, the western frontier of the United States has played a central role in the development of the American people and of their institutions. Of particular importance to the directions American ...
Rangeland reflectance characteristics measured by aircraft and spacecraft sensors
(1978)
Rangeland vegetation and soil measurements were related to composite rangeland reflectance measurements from Landsat multi spectral scanners (MSS) and color infrared aerial photographs. Ground data and remote sensor ...
Optimal grain sorghum irrigation strategies in a dynamic, stochastic environment
(1978)
Agricultural production and associated economic effects of irrigation on the Texas High Plains are seriously threatened by a rapidly declining groundwater supply and a swift upward trend in energy costs. To optimize the ...
The relation between oxygen and water uptake by roots of intact plants
(1978)
Bean plants (Phaseolus vulgaris L. var. 'Blue Lake') were grown in small pots, transferred to large root chambers with washed quartz sand and further established until the flowering stage, in a large growth chamber. Maximum ...
The impact of bargaining unit placement on the role perceptions of departmental chairmen in four-year schools of allied health professions
(1978)
Purpose: The purpose of this study was to determine if bargaining unit placement of chairmen in selected departments or programs of allied health professionals influenced their perceptions of the duties, goals and satisfaction ...
Effect of dietary sand on the performance of broilers and laying hens
(1978)
Experiments were conducted with 380 Hy-line pullets fed dietary supplements of 0, 5, 10, or 15 percent sand for twelve 28-day periods and with 440, 120, and 540 day-old Hubbard x Hubbard broiler chicks fed diets with up ...
The influence of drip irrigation on vegetative growth, yield, nut quality, and leaf water potential of mature pecan trees, Carya illinoensis (Wang) K. Koch
(1978)
Twenty-five year old Stuart pecan trees were drip irrigated during the 1976 and 1977 growing seasons. Treatments consisted if 132, 283 and 454 liters per day and a control which received no supplemental irrigation. The ...
The population dynamics and natural mortality of the lesser cornstalk borer, Elasmopalpus Lignosellus, in the peanut agroecosystem and the biology of selected primary parasites
(1978)
The temporal distribution of the lesser cornstalk borer (LCB), Elasmopalpus lignosellus (Zeller), was variable in selected peanut fields during 1975-1977. Three distinct generations occurred in 1975 and 2 in 1976. Generations ...
Integrated pest management model for cotton production
(1978)
The cotton ecosystem can be seen as a dynamic biological system that occasionally must be adjusted when one element, such as insect pests, gains undue strength. The objective of this research has been to develop a computerized, ...
An electro-optic light scattering photometric polarimeter
(1978)
The angular dependence of the radiance and polarization of light scattered by a suspension of small particles depends on the polarization of the incident light. This dependence, which in general cannot be computed, can be ...