Dissertations and Theses

Soil-relief relationship in areas under coffee cultivation in southwestern Minas Gerais.

Author: Maria Gabriela Baracat Sanchez

Keywords: physical attributes; chemical attributes; Coffea arabica L; geostatistics

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Summary

The objective of this work was to study the application of techniques to characterize and relate the spatial variability of soil chemical and physical attributes, in the context of the soil-landscape relationship, and technological attributes of fruits, in order to establish cause and effect relationships of productivity and fruit quality. In a perennial orange orchard, soil samples were taken at regular intervals of 50 m in mesh form, totaling 332 points sampled, at the depths of 0.0-0.2 m and 0.6-0.8 m for chemical determination and texture. Samples of fruit were also collected, where they were carried out technological analyzes, and leaf, analysis of macro and micronutrient contents. Three segments were identified and delimited relative to the position in the study strand. Data were submitted to descriptive and geostatistical statistical analyzes (semivariograms modeling and kriging maps). Latosols, although considered as very homogeneous soils, in this study showed variability of the granulometric and chemical attributes differentiated in the segments of the mapped slope. The nutrient contents also presented spatial variability, with the majority of them presenting the greatest variability in the concave pedoform. It will be necessary new statistical approaches, because although the quality of the fruit presents spatial dependence of the relief, in this work, did not present significant relations with the granulometric and chemical attributes of soil and plant. However, it was possible to note from the fruit data the need for new harvesting strategies.