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Variables Affecting the Use of Positive Displacement Pumps to Apply Herbicides in Ultralow Volume

Published online by Cambridge University Press:  12 June 2017

James E. Hanks  and
Chester G. McWhorter
James E. Hanks
Affiliation:
Field Crops Mech. Res. Unit, USDA-ARS, Stoneville, MS 38776
Chester G. McWhorter
Affiliation:
Southern Weed Sci. Lab., USDA-ARS, Stoneville, MS 38776
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Abstract

Water and paraffinic oils were used to determine variables that affect positive displacement pumps used to meter liquid flow in an air-assist spray system. Components needed to construct an air-assist spray system were described for use in spray chambers and on a tractor for field application of herbicides in ultralow volume (ULV). The flow rate of the pump varied less than 2% for the water and oil as the pump setting was varied from 0 to 100% of the pump's capacity. Linear relationships were shown for both liquids as the voltage input varied from 4 to 13 volts. Air pressures to 100 kPa and liquid temperatures to 35 C did not affect flow rate of the pump. Volume median diameter of the spray droplets decreased from 295 μm to 77 μm and 159 μm to 85 μm for water and paraffinic oil, respectively, as the air pressure was adjusted from 14 to 110 kPa.

Keywords

Air-assistherbicide applicationlow volumeparaffinic oil
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 111 - 116
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

Literature Cited

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