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factors influencing yield; (2) the need for real-time data and rapid processing and analysis to enable
temporal as well as spatial management decisions; and (3) the need for sensors that can measure
dynamic soil properties and crop responses to those properties. Furthermore, no single study has
been conducted that evaluates SSCM from a holistic perspective of environmental, productivity,
and economic impacts. This task remains as a future goal for agronomists and soil and environmen-
tal scientists. Geophysical techniques will play a crucial role in any future holistic evaluations.
The integrated use of multiple remote and ground-based sensors is the future direction that agri-
culture will likely take to obtain the extensive spatial data that will be needed to direct variable-rate
technologies. Variable-rate technologies driven by a network-centric system of multiple sensors will
ultimately take SSCM from a drawing board concept to a reality.
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