Definition of management zones in coffee production fields based on apparent soil electrical conductivity

Authors

  • Domingos Sárvio Magalhães Valente UFV; Depto. de Engenharia Agrícola
  • Daniel Marçal de Queiroz UFV; Depto. de Engenharia Agrícola
  • Francisco de Assis de Carvalho Pinto UFV; Depto. de Engenharia Agrícola
  • Nerilson Terra Santos UFV; Depto. de Estatística
  • Fábio Lúcio Santos UFV; Depto. de Engenharia Agrícola

DOI:

https://doi.org/10.1590/S0103-90162012000300001

Keywords:

Coffea Arabica L., geostatistics, fuzzy k-means, soil sensors

Abstract

Fertilizer application at variable rates requires dense sampling to determine the resulting field spatial variability. Defining management zones is a technique that facilitates the variable-rate application of agricultural inputs. The apparent electrical conductivity of the soil is an important factor in explaining the variability of soil physical-chemical properties. Thus, the objective of this study was to define management zones for coffee (Coffea Arabica L.) production fields based on spatial variability of the apparent electrical conductivity of the soil. The resistivity method was used to measure the apparent soil electrical conductivity. Soil samples were collected to measure the chemical and physical soil properties. The maps of spatial variability were generated using ordinary kriging method. The fuzzy k-means algorithm was used to delimit the management zones. To analyze the agreement between the management zones and the soil properties, the kappa coefficients were calculated. The best results were obtained for the management zones defined using the apparent electrical conductivity of the soil and the digital elevation model. In this case, the kappa coefficient was 0.45 for potassium, which is an element that is associated with quality coffee. The other variable that had a high kappa coefficient was remaining phosphorous; the coefficient obtained was 0.49. The remaining phosphorus is an important parameter for determining which fertilizers and soil types to study.

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Published

2012-06-01

How to Cite

Valente, D. S. M., Queiroz, D. M. de, Pinto, F. de A. de C., Santos, N. T., & Santos, F. L. (2012). Definition of management zones in coffee production fields based on apparent soil electrical conductivity . Scientia Agricola, 69(3), 173-179. https://doi.org/10.1590/S0103-90162012000300001

Issue

Section

Agricultural Engineering