Spatial variability of some chemical properties of a Cambisol soil with cocoa (Theobroma cacao L.) cultivation Variabilidad espacial

Abstract

ABSTRACT

Objective: To evaluate the spatial variability of some chemical properties of a Cambisol soil to establish specific zones of agronomic management for the cultivation of cocoa.

Methodology: A sampling of 42 georeferenced points equidistant to 40 m was carried out. With the results of the chemical analysis of the properties of the soil (PSA), maps of geostatistical variability were made, using ordinary kriging.

Results: It was found that the percentage of acidity saturation (PSA), acidity and H⁺ presented high variability; P-Olsen, interchangeable K, Ca and Mg medium variability, and p^H, MO, CIC and Al showed low variability. Properties of soil p^H, PSA; P-Olsen, interchangeable Ca and Mg presented high spatial dependence (<25%), MO, interchangeable K and CIC moderate spatial dependence (25-75%).

Limitations of the study / implications: The generated maps allowed the identification of partial areas with different variability, as well as the direction of greater variability of the property as a function of distance.

Conclusions: With the maps it was possible to make recommendations for agronomic management depending on each specific management area.

Keyword: Cambisol, variability, recommendations, specific site, cocoa, Kriging.