Site-Specific Weed Control in On-Farm Research - Luschei, Ed
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This thesis examines, in both an experimental and theoretical context, the conditions under which site- specific management is likely to be advantageous. Initially, site-specific and broadcast herbicide treatments were applied in a large-scale block design , then subsequently compared using site-specific yield data. I calculated the net return as a function of the proportion of field treated and determined the theoretical threshold necessary to make site-specific weed control profitable. Using supplemental quadrat count data, I parameterized a relationship describing the competitive effect of…mehr

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Produktbeschreibung
This thesis examines, in both an experimental and theoretical context, the conditions under which site- specific management is likely to be advantageous. Initially, site-specific and broadcast herbicide treatments were applied in a large-scale block design , then subsequently compared using site-specific yield data. I calculated the net return as a function of the proportion of field treated and determined the theoretical threshold necessary to make site-specific weed control profitable. Using supplemental quadrat count data, I parameterized a relationship describing the competitive effect of wild oat on spring wheat using the site-specific yield data. I suggest that creating locally parameterized stochastic functions may improve the accuracy of input response prediction over regional small-plot experiments because of field-specific effects, which are not calibrated by regional small plot experiments. Lastly, I investigated the importance of weed demography in weed control decisions and developed an analytical approximation to the long-term economic threshold based on the population growth rate.
Autorenporträt
Ed received his BA from Reed College in Portland, OR, in 1991. His MA in complex systems/physics was completed at UT-Austin in 1994. In 2001, Ed completed his PhD degree from the Dept of Land Resources and Environmental Sciences at MT State University and has since been faculty in the Dept of Agronomy at Univ of Wisconsin - Madison.