Soil Genesis and Development, Lesson 1 - Rocks, Minerals, and Soils
This lesson identifies some common rocks and minerals and how they influence soil formation.
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Transpiration - Water Movement through Plants
This lesson and its animation follows the journey of water through a plant from its uptake by roots to its evaporation from the leaf surface. How this journey is altered by plant characteristics such as stomata and cuticles as well as by changes in the environment will be described.
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Auxin and Auxinic Herbicide Mechanism(s) of Action - Part 1 - Introduction
The selective control of broadleaf weeds in cereal grain crops by auxinic herbicides has made this group one of the most widespread and important herbicide families in use. These herbicides were the first organic herbicides developed that were selective or able to kill one group of plants, but not another (i.e. kill broadleaf, but not grass plants). This lesson will introduce the major features of these herbicides, discuss their major uses and describe the symptoms of the injury they cause as well as introduce how they kill sensitive plants.
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Herbicide Resistance: Mechanisms, Inheritance, and Molecular Genetics
This lesson will detail the biochemical mechanisms and genetics of herbicide resistance in weeds. Herbicide resistance is one of the major issues in weed science today; therefore, it is important to have a basic understanding of the process by which it occurred. The management and spread of herbicide-resistant weeds in relationship to the biochemical mechanisms and inheritance of resistance will be explained. Resistance based on changes in the target site versus resistance based on detoxification or other types of resistance will be described.
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