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Fluid Journal : Fluid Journal 2005-2007
20 Fluid Journal FALL 2007 Glyphosate [N- (phosphonomethyl) glycine] is the most extensively used herbicide in the history of agriculture. Glyphosate weed management programs in field crops have provided highly effective weed control, reduced concern for residual chemicals in the environment, simplified management decisions, and resulted in cleaner harvested products. This relatively simple compound (modification of the essential amino acid glycine) is an economical and effective broad-spectrum systemic herbicide that can have extensive non-target effects on nutrient availability, soil environment, and agricultural sustainability. Through its active chelation of specific mineral elements, glyphosate DR. DON M. HUBER What About Glyphosate-Induced Manganese Deficiency? SUMMARY Summary: Glyphosate weed management programs can influence all components of the "plant disease triangle" by reducing plant uptake and translocation efficiency, changing soil biology, and modifying nutrient form or availability in the environment. Crop cultivars highly efficient in nutrient uptake should be selected where possible. Remediation treatments for micronutrient deficiency (Fe, Mn, Zn) should be applied at least eight days after the glyphosate event, and glyphosate formulations least inhibitory to plant essential functions and the soil biota should be used where possible. Biological amendment with glyphosate-resistant organisms (Mn reducers and N fixers) needs further study, as well as more effective means of detoxifying glyphosate in the rhizosphere. Alternate weed control or the use of non-systemic herbicides should be considered to minimize impacts on soil organisms and predisposition to disease. Herbicide rotation may be as important as crop rotation in the future. Take heart. There are strategies to get around the far-reaching non-target effects that this most extensively used herbicide in the history of agriculture can have on susceptible plants.
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