Abstract
Studies were conducted to evaluate two precision farming technologies for weed control in a Mississippi Delta Management Systems Evaluation Area (MDMSEA) watershed. A sensor-controlled hooded sprayer that utilized spectral reflectance type sensors to detect and spray only where weeds were present was evaluated for three years in the Deep Hollow Lake watershed. The sensor-controlled sprayer provided adequate weed control and resulted in 3-year average reductions in pesticide usage of 73% and 49%, respectively for cotton (43 ha) and soybeans (47 ha). Additionally, evaluation of global positioning systems (GPS) and geographical information systems (GIS) for weed mapping confirmed that significant reductions in herbicide usage could be obtained with this technology. The geo-referenced maps indicated that weeds generally occur sporadically over a field and that prescription application of herbicides could be used with GPS-controlled applicators to treat only those specific areas where weeds had germinated in the fields.
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