Graph one depicts the possible distance a
spray droplet particle can physically drift downwind. Common to all scenarios
depicted are 40 percent relative humidity, 20 degrees Celsius and an operating
pressure of forty pounds per square inch. In the first scenario, a two hundred
micron diameter droplet released one half metre from the ground does not drift
more than a quarter of a metre, even in fifteen kilometer an hour winds. In scenario
two, the same droplet released one metre from the ground can move as far as three
metres with a fifteen kilometre and hour wind. In scenario three, a one hundred
micron diameter droplet released half a metre from the ground drifts considerably
farther: almost six metres downwind in a fifteen kilometer and hour wind. In scenario
four, that same droplet released one mtre from the ground can travel as far as
sixteen metres in a fifteen kilometre an hour wind. In all cases, there is a linear
relationship between distance drifted and apparent wind speed.
to Which factors reduce pesticide drift.