According to the
development of agricultural mechanization, farm work has become efficiently.
However, we have been having soil compaction
problem by traffics of heavy agricultural tractors and instruments. To
improve soil compaction in agricultural fields, subsoiling or deep tillage
is effective. But it is hard to decide the time for subsoiling or deep
tillage to reduce soil compaction and to evaluate the effect of the work.
Because, it is difficult to investigate the soil physical condition at
deep area in fields. So we have been trying to investigate soil compaction
in fields by the visualization of soil cone resistance. A recording cone
penetrometer (Agridry CP-40) with D-GPS (Trimble Pathfinder) and GIS
software (ArcView 9.0) were investigated to measure cone resistance and
to generate cone resistance distribution map. CP-40 with GPS receiver
are not heavy to carry and cone resistance with the coordinates of measuring
point is measured by oneself. Only two dimension maps are generated by
ArcView, however, these cone resistance distribution maps will be investigated
with yield map, soil moisture map, nitrogen map and so on. It is concluded
that this system is practical to investigate soil compaction.