African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Optimization of number of sampling points required for studying the vineyard soil

  Djordjević Aleksandar, Aleksić Velimir, Savanović Marija2, Savanović Rajko4* and Milojković Boban3
  1Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Zemun, Republic of Serbia. 2Geodetic Technical School, Milana Rakića 42, 11000 Belgrade, Republic of Serbia. 3Academy of Criminalistic and Police Studies, Cara Dušana 196, 11080 Zemun, Republic of Serbia. 4College of Vocational Studies for Civil Engineering and Geodesy, Milana Rakića 42, 11000 Belgrade, Republic of Serbia.  
Email: [email protected]

  •  Accepted: 28 November 2011
  •  Published: 12 December 2011

Abstract

 

High variability of pH on a very small scale has effects on growth of two grapevine varieties on rootstock Kober 5BB: Riesling and Pinot Noir. A number of 104 soil samples were taken from an experimental area from two depths. The aim of this experiment was to find the optimum number of samples for pH studies, and to implement the obtained results in further investigation on experimental fields. Therefore, in this paper, we compared three different deterministic interpolation techniques on the results of soil pH. Root mean square error statistics obtained after cross validation procedure was used for the choice of appropriate exponent value for these three techniques. The obtained interpolation parameters were used for mapping the field. Maps were classified and compared by means of area among classes of pH in respect to classes obtained after maximum sampling. 

 

Key words:  Vineyard, soil, pH, interpolation, inverse distance weight (IDW), radial basis functions (RBF), local polynomial (LP).