摘要：The majority of all research and technical developments in site specific management(precision farming) are in the areas of weed control and variable rate application offertilizers and lime. Site specific management can be defined as the application ofspecific inputs based on the varying need of that input within a field, as opposed tomanagement of inputs based on the mean of the field. However, the difference inconventional agriculture production systems and site specific production systems is theresolution or "field size" at which we manage. That resolution can range from a farmwithin the farming enterprise, to a field within a farm, to a management zone, to afundamental field element or cell, or to an individual plant. Except at the individual plantlevel, all areas are managed "on the average". The following discussion focuses threetechnologies that can be agronomically and economically viable: nutrient managementzones defined by yield mapping or remote sensing; variable rate application of nitrogenfertilizers using real-time sensing and application; and optical sensing and spot sprayingweeds. In addition, the issue of the resolution at which yield variability is managed willbe discussed.
