Degree Type
Thesis
Date of Award
2019
Degree Name
Master of Science
Department
Agronomy
Major
Crop Production and Physiology
First Advisor
Matthew . Darr
Second Advisor
Robert . Hartzler
Abstract
Sense and spray weed management, as defined by this paper, is the ability to detect individual or small groups of weeds within a field and selectively spray just the weeds that were detected. These technologies reduce the total volume of herbicides per unit area that would have been applied with a conventional broadcast application. Sense and spray weed management may be thought as a subcategory of traditional site-specific weed management. Sense and spray weed management technologies aim to reduce the impact of herbicides on the environment, while improving the farm’s profitability. As sense and spray weed management technologies become commercially available, they will bring with them questions about their ability to detect and make spraying decisions accurately. Outlined in this paper are two methods that can be used by researchers, farmers, and technology developers to evaluate these technologies. These methods are reproducible across many different farming situations. A blue dye method can be used to visually access a technology’s detection and application efficacy. A strip sampling method can be used to estimate the weed escapes that make it past the weed control methods. The successful integration of these technologies on the farm will be dependent upon their ability to control weeds at a similar level to the conventional broadcast applications that are being utilized currently. Currently, since no commercially acceptable efficacy benchmarks exist for these technologies, all comparisons should be made to the conventional broadcast applications. In addition, broadcast applications of residual herbicides will likely continue to play a useful role in managing weed populations.
Copyright Owner
Joshua J.R. DeGroot
Copyright Date
2019-12
Language
en
File Format
application/pdf
File Size
72 pages
Recommended Citation
DeGroot, Joshua J.R., "Evaluation techniques for sense and spray weed management" (2019). Graduate Theses and Dissertations. 17666.
https://lib.dr.iastate.edu/etd/17666