The global trend to shift from highly toxic pesticides to environmentally safe and less toxic chemicals requires, generally, very high spatial uniformity of the spray deposition. Effective penetration of the spray into a dense canopy can be achieved by utilizing fast air-streams. In contrast, slow and turbulent flow near the leaves and the stems is required for good deposition of the spray. A new sprayer was designed to achieve a sharp decline in air velocity to meet the two — seemingly contradictory — constraints, and thereby obtain effective penetration and coverage of dense canopy. In the present work, air ducts with several shapes of air outlets were developed and tested in an attmept to meet these requirements. Generally, a short and wide air slit created a moderate decline in air velocity; a longer and narrower air slit improved the uniformity of the air velocity along the slit outlet, and brought about a sharper decline in speed of the air-streams. Installing air deflectors at the air outlets added a slight upward motion to the air-streams and enhanced spray deposition on the underside of leaves. Preliminary field tests with the long and narrow air slit showed uniform spray deposition on all plant parts.
[1]
Equipment and methods for orchard spray application research II: The geometry of apple trees
,
1968
.
[2]
Graham Matthews,et al.
Pesticide application methods
,
1979
.
[3]
D. Bache.
Particle transport within plant canopies — I. A framework for analysis
,
1979
.
[4]
D. Bache.
Particulate transport within plant canopies—ii. prediction of deposition velocities
,
1979
.
[5]
T. B. Sutton,et al.
Evaluation of the tree-row-volume concept with density adjustments in relation to spray deposits in apple orchards
,
1984
.
[6]
S. Gan-Mor,et al.
Pollination of Tomato Flowers by a Pulsating Air Jet
,
1984
.
[7]
H. Frankel.
Pesticide Application: Technique and Efficiency
,
1986
.
[8]
G. Matthews,et al.
Application Technology for Crop Protection
,
1993
.