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The Role Of Nematodes In A South Dakota Grassland Ecosystem, James D. Smolik
The Role Of Nematodes In A South Dakota Grassland Ecosystem, James D. Smolik
Electronic Theses and Dissertations
In an attempt to elucidate the role of nematodes in a grassland ecosystem nematode taxa, number and biomass data was gathered over a three year period at the Cottonwood International Biological Program Grassland Biome site in western South Dakota. The effects of grazing intensity, sampling date and sampling depth were studied. Nematicide treatment of range grasses in field and greenhouse studies was also used to evaluate the role of nematodes. Biomass data was used to estimate the intake of plant feeding nematodes. Results obtained demonstrate that soil inhabiting nematodes constitute a significant proportion of the consumer biomass at the Cotton[1]wood …
A Study Of Energy And Water Transfer In Irrigated And Nonirrigated Sorghum, Loyd Raymond Stone
A Study Of Energy And Water Transfer In Irrigated And Nonirrigated Sorghum, Loyd Raymond Stone
Electronic Theses and Dissertations
Approximately 70% of all precipitation is lost through percolation out of the root zone or by evapotranspiration (evaporation from the soil plus transpiration from plants). Estimation of these water loss processes has generally been on a small scale due to the cost and time required for their measurement. Development of remote thermal scanners has provided a possible means of estimating water loss from surfaces by using the surface temperature. This study was designed (a) to determine water movement patterns in the soil profile and (b) to evaluate the feasibility of using canopy temperatures in estimating evapotranspiration rates from cropped areas. …
Growth, Development, And Plant Temperature Characteristics Of Oats Under Water Stress, Bikkar S. Sandhu
Growth, Development, And Plant Temperature Characteristics Of Oats Under Water Stress, Bikkar S. Sandhu
Electronic Theses and Dissertations
Little information is available on sensitivity of oats to water deficits. Therefore, this study was designed (a) to investigate physiological response of oats to water stress, (b) to determine quantitative effect of water deficits on growth and yield components of oats, and (c) to evaluate plant temperature of oats as a water stress index. Spring oats (Avena sativa L.) grown under field conditions were subjected to 10-11 day stress at boot stage, at anthesis through early grain formation stage and at both stages in combination. Diurnal and seasonal patterns of relative leaf water content, leaf diffusion resistance, and net photosynthesis …