Measuring the spatial performance of chemical applicators

Jonathan Chaplin, Eugene Roytburg, Joseph Kaplan

Research output: Chapter in Book/Report/Conference proceedingChapter

6 Scopus citations


This chapter focuses on variability attributable to driving precision and presents the theory, methodology and practical testing for a single disk mounted fertilizer spreader. The theory is applicable to sprayer and dry chemical applicators. The chapter presents a list of sources of variation that may account for spatial variability in an overall model. It provides insight into how the quality of material distribution may be evaluated for spreaders used in site specific application of materials. When operating at the effective swath width the range of application rates indicated poor spreader performance as they frequently were >120% or <80% of the mean rate. The chapter aims to develop a statistically sound model that explains the spatial variability of materials applied with a field applicator. The variability determined by either the differential or the integral method are 50% > the variability determined using the ASAE Standard.

Original languageEnglish (US)
Title of host publicationSite-Specific Management for Agricultural Systems
Number of pages19
ISBN (Electronic)9780891182603
ISBN (Print)9780891181279
StatePublished - Sep 1 1995

Bibliographical note

Publisher Copyright:
© 1995 by the American Society of Agronomy, Inc.


  • ASAE standard
  • Chemical applicators
  • Collection method
  • Driving precision
  • Fertilizer spreader
  • Practical testing
  • Spatial variability


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