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...Precision farming approaches to small farm agricultrue sakae shibusawa faculty of agriculture tokyo university and technology saiwai cho fuchu japan abstract implies a management strategy increase productivity economic returns with reduced impact on the environment it is based application information description variability in field variable rate operations decision making system there are three levels strategies development practices can be used farms as well big ones they play core role rural programs which integrated industry real time soil spectrophotometer was developed describe farmers fields introduction while decreasing production costs minimizing environmental precison provides new solution nrc sky using systems approach for today s agricultural issues such need balance elements concerns advanced fundamental includes describing modeling variation this fig soils plant species integrating meet site specific key concept requirements aims at increased particular within reducing en...