Agriculture Reference
In-Depth Information
•
droplet size can be adjusted by speed of rotation
low-pressure pump and components.
Limitations:
•
•
relatively high cost
•
foliar penetration may be limited on gravity type
•
not suitable for use in windy conditions.
Figure 8.12
An air blast sprayer (EPA,
Applying Pesticides Correctly
).
3.
Recirculating Sprayers
These devices usually are used to apply contact herbicides to weeds which
are taller than the crop in which they are growing. Solid streams of highly
concentrated herbicides are directed across rows above the crop. Spray material
which is not intercepted by the weeds is caught in a box or sump on the op-
posite side of the row and is recirculated.
Advantages:
•
uses small quantities of pesticide
•
less pesticide moves off target and into environment
•
permits treatment of weeds which have escaped other control
measures
protects susceptible nontarget plants from injury.
Limitations:
•
•
use limited to special situations
•
relatively high cost.
