Dissertations and Theses
Spatial characterization of attributes of Oxisols and Podzolsby cluster analysis in areas under sugar cane cultivation
Author: Renato Junqueira Pazeto
Keywords: landforms; management zones; multivariate analysis
Summary
The multivariate analysis emerges as a new tool used in agriculture, implying the collection and manipulation of a large amount of data that can only be managed by computational methods. Its purpose is to classify samples, individuals or variables into groups with similar characteristics based on association groups, of which there are several types, each leading to different but complementary results. The main objective of this study was to establish groups with similar characteristics, in granulometric and chemical attributes, in different soil classes under sugarcane cultivation. The study area is located in the municipality of Jaboticabal, SP, which is located in the geomorphological province of Costas Basálticas, in a sandstone-basalt lithostratigraphic transition area, predominating the sandstones of the Adamantina Formation. Areas under the same sugarcane management history were chosen, where the soil maps of the plant recorded the classes of latosols (convex form) and argisols (linear form). The region presents smooth undulating relief with average altitude of 600m. In the areas were collected 91 points in the argisol and 135 in the latosol. The contents of sand, silt and clay, pH in CaCl2, and contents of MO, P, Ca2 +, Mg2 +, K +, Al3 + and H ++ Al3 + were determined. With the results, the classical statistics (mean, median, standard deviation, coefficient of variation, asymmetry coefficient and kurtosis coefficient) and multivariate analysis (cluster analysis) were compared to the two geomorphic surfaces, of the relief, so the mapping of the different relief forms becomes an important tool to delimit management zones.