no synthetic agrochemicals (Table 1). Both cultivation types have
just one water entrance and one water exit. Entrance and exit
points were about 550 m apart in diagonal corners of the rectangular
field in Bagatzi and 350 m apart in La Pacifica. Irrigation canals
were concrete-lined or a rocky streambed that, except for natural
rainfall runoff, received minimal contamination from streams or
neighboring lands and were constructed to flow under any crossed
streams.Additionally, no water from surroundingfields entered the
area.