U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Main content area

Plant canopy characteristics effect on spray deposition

R. C . Derksen, H. E. Ozkan, P. A. Paul, H. Zhu
Aspects of Applied Biology 2014 v.122 pp. 227-235
Glycine max, Triticum aestivum, air, canopy, field experimentation, soybeans, spray deposition, spray volume, stems, wheat
While it is common for applicators to standardize their application parameters to minimize changes in settings during a season, this practice does not necessarily provide the best delivery when targeting different types of plant canopies and different zones within the canopy. The objective of this work was to identify application parameters for maximizing spray deposition and coverage on plant parts with vertical and horizontal orientations. Wheat field trials, conducted over three years, were designed to follow-up on previous soybean trials to evaluate the effect of spray quality, spray volume, and air assistance on the fate of sprays on vertical and horizontal portions of wheat plants. Over the range of application parameters evaluated, increasing the angle of the spray relative to vertical helped produce higher deposits on vertical plant sections in a wheat canopy. Vertical spray delivery was better at treating horizontal targets through a denser and deeper soybean canopy. Large droplet applications were more effective at getting spray material near the bottom of a narrow-row soybean canopy than onto the vertical heads or stems of wheat plants. Smaller droplet sizes were difficult to deliver down through a mature soybean canopy than medium or coarse spray quality sprays. These findings demonstrate that spray parameters should not be expected to perform similar in all canopy types and should be modified to the most effective delivery of the spray to the targeted treatment zones.