Abstract

JARAMILLO J., DANIEL F.; SADEGHIAN K., SIAVOSH  and  LINCE S., LUZ A.. SPATIAL VARIABILITY OF BASES IN AN ANDISOL OF THE COLOMBIAN CENTRAL COFFEE ZONE. Bol. cienc. tierra [online]. 2013, n.33, pp.111-124. ISSN 0120-3630.

In a coffee farm in the department of Quindío, Colombia a study of the spatial variability of bases in andisols was made, doing a sampling grid of 20 x 20 m. The base contents should have transformed to logarithm. The Ca and Mg logarithms had quadratic spatial trend, and they and the K log presented experimental semivariogram that suggest a patchy distribution. All the variables presented covariables that when included, together with the spatial trend, in the semivariogram calculation, accentuated even more the patch effect in them. Maps were drawn with different data sets and interpolation systems to assess the distribution of base contents in the lot. The three maps of Ca log and the three of Mg log were very similar among themselves and practically zoned the lot in similar way. Both maps of log K, elaborated with and without covariables, were very different and produced two different zoning. According to the obtained maps, Mg and K fertilization can be made with techniques of handling by specific site. On the other hand, with Ca there must be done an application generalized to the whole lot, based on its content average, since it has been done traditionally.

Keywords : Precision agriculture; geostatistics; site-specific management; coffee.

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