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vol.39 issue4RELATIONSHIP BETWEEN SOIL PHYSICAL AND CHEMICAL PROPERTIES AND YIELD OF GOLDEN GRASS IN THE JALAPÃO REGION, TO, BRAZILEUCALYPTUS PRODUCTIVITY, SOIL PHYSICAL PROPERTIES AND ORGANIC MATTER FRACTIONS INFLUENCED BY TRAFFIC INTENSITY AND HARVEST RESIDUES author indexsubject indexarticles search
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Revista Brasileira de Ciência do Solo

Print version ISSN 0100-0683On-line version ISSN 1806-9657

Abstract

MENDONCA, Patrícia Gabarra et al. SPATIAL UNCERTAINTY OF NUTRIENT LOSS BY EROSION IN SUGARCANE HARVESTING SCENARIOS. Rev. Bras. Ciênc. Solo [online]. 2015, vol.39, n.4, pp.1181-1189. ISSN 1806-9657.  http://dx.doi.org/10.1590/01000683rbcs20140432.

The assessment of spatial uncertainty in the prediction of nutrient losses by erosion associated with landscape models is an important tool for soil conservation planning. The purpose of this study was to evaluate the spatial and local uncertainty in predicting depletion rates of soil nutrients (P, K, Ca, and Mg) by soil erosion from green and burnt sugarcane harvesting scenarios, using sequential Gaussian simulation (SGS). A regular grid with equidistant intervals of 50 m (626 points) was established in the 200-ha study area, in Tabapuã, São Paulo, Brazil. The rate of soil depletion (SD) was calculated from the relation between the nutrient concentration in the sediments and the chemical properties in the original soil for all grid points. The data were subjected to descriptive statistical and geostatistical analysis. The mean SD rate for all nutrients was higher in the slash-and-burn than the green cane harvest scenario (Student’s t-test, p<0.05). In both scenarios, nutrient loss followed the order: Ca>Mg>K>P. The SD rate was highest in areas with greater slope. Lower uncertainties were associated to the areas with higher SD and steeper slopes. Spatial uncertainties were highest for areas of transition between concave and convex landforms.

Keywords : green cane harvesting; burnt cane harvesting; geostatistics; landforms; sequential Gaussian simulation.

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