Design and integration of components for site specific control of fertilizer application

J. van Bergeijk

Research output: Thesisinternal PhD, WU


<p>Keywords: Precision Agriculture, Site Specific Agriculture, Global Positioning System, GPS, Fertilizer Application, Information System.</p><p>Spatial and temporal variability in soil, crop and climate characteristics results in non optimal use of fertilizers when the application rate is kept constant within agricultural fields. Components to adapt the fertilizer rate to site specific conditions are identified and discussed. One of the basic components is positioning; both for data acquisition and for site specific control, a reliable and accurate positioning device has to be available. For a correct description of the spatial variability of soil properties often many samples are required. The possibility to reduce the number of soil samples by means of correlation with recorded plough draught is presented. Next to data recording, site specific control of a fertilizer spreader is discussed. Not just adaption of fertilizer rate to local requirements but also recording of applied fertilizer amount is important. Calculation of the required amount of fertilizer is based on information from different sources. To accommodate this data exchange, an information model for processing of spatial and temporal data is presented. Field experiments were conducted to evaluate the components and determine the required spatial scale of operation. To describe the soil variability, a grid with a cell size of 5 by 5 meter was necessary. The positioning system was sufficiently accurate but the implements for the application of fertilizer had to be modified to vary application rate that precise.</p>
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
  • Speelman, L., Promotor
  • Goense, D., Promotor, External person
Award date29 Oct 2001
Place of PublicationS.l.
Print ISBNs9789058085351
Publication statusPublished - 2001


  • fertilizers
  • farm management
  • application methods
  • farming systems
  • information systems
  • agricultural engineering
  • soil types
  • global positioning systems
  • precision agriculture
  • fertilizer application


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