Foil drop generator for foliar chemigation: Field evaluation

W. A. Marouelli, Peter M Waller

Research output: Contribution to journalArticle

Abstract

Chemigation field experiments were conducted with a new drop generator for oil-based foliar chemicals. The drop generator was adjusted to generate two drop-size distributions with d(max) of 980 μm and 98 μm. Soybean oil concentration in sprinkler sprays was measured along the 379-m-long center pivot irrigation pipeline; uniformity coefficients along the center pivot pipeline were 73% and 98%, respectively. An experiment with a conventional straight tube injector was also conducted, and calculated d(max) was 1850 μm; oil discharge uniformity coefficient along the pipeline was 61%. The calculated drop-size distributions for the three experiments were input into a dispersed phase pipeline transport model; the model calculates oil discharge concentration versus distance along the pipeline. The root mean square deviation error between experimental and simulated concentration curves were 40%, 28%, and 3% for the straight tube, 980 μm, and 98 μm experiments, respectively. The models were used to develop graphs for discharge concentration uniformity as a function of d(max) and relative density of oil and water in the pipeline. The model simulations and experiments showed that the drop generator and two-phase transport model provide the ability to control oil discharge concentration uniformity along a center pivot pipeline.

Original languageEnglish (US)
Pages (from-to)1599-1607
Number of pages9
JournalTransactions of the American Society of Agricultural Engineers
Volume42
Issue number6
StatePublished - Nov 1999

Fingerprint

chemigation
foil
generators (equipment)
Metal foil
Oils
Pipelines
oil
oils
Gas generators
Experiments
Soybean Oil
Specific Gravity
experiment
center pivot irrigation
injectors
Soybean oil
sprinklers
evaluation
Irrigation
soybean oil

Keywords

  • Center pivots
  • Chemigation
  • Droplet size distribution
  • Foliar washoff
  • Irrigation
  • Transport simulation
  • Two phase flow

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)

Cite this

Foil drop generator for foliar chemigation : Field evaluation. / Marouelli, W. A.; Waller, Peter M.

In: Transactions of the American Society of Agricultural Engineers, Vol. 42, No. 6, 11.1999, p. 1599-1607.

Research output: Contribution to journalArticle

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