[PDF] Top 20 REDUCTION OF SAMPLE SIZE IN THE ANALYSIS OF SPATIAL VARIABILITY OF NONSTATIONARY SOIL CHEMICAL ATTRIBUTES

... In the study of spatial variability of soil attributes, it is essential to define a sampling plan with adequate sample ...data, the influence ... See full document

... technicians, in most cases, ignore the aspects related to the spatial variability of the soil acidity attributes when liming requirement is ...calculated. ... See full document

... ABSTRACT: In geostatistical modeling of soil chemical properties, one or more influential observations in a dataset may impair the construction of interpolation maps and ... See full document

... demarcate the sampling points. At each sampling site, four sub-samples of soil were collected in the crown projection area, forming a composite sample from 0-20 cm soil ... See full document

... geostatistical analysis through semivariograms, TP had no spatial dependence at depths of ...Thus, the variability of this variable can be considered aleatory, and lower spacing ... See full document

... - The aim of this study was to evaluate the spatial dependence between chemical properties of the soil and yield components in the soybean using ... See full document

... Soil spatial variability appears since formation and continues after the soil reaches its dynamic ...because the parent material is not uniform due to differences in ... See full document

... Spatial variability evaluation of qualitative attributes can be used as an excellent strategy to design forms of intervention that result in better crop profitability for some ... See full document

... In the scope of the correlation between the attributes of plant and plant (Figure 1), we observed that the regression equation of the DBH according to ... See full document

... 47.8% in the 0.20-0.40 m depth layer, showing higher concentration of roots in the soil surface layer, followed by a reduction of the space occupied by them ... See full document

... between soil attributes and sugarcane yield were lower than ...most soil attributes (Table 3). These low correlations confirm the tendency observed by other researchers (Yanai et ...and ... See full document

... comparison of variability among samples of variables with different units, but it does not allow analysis of spatial variability of soil properties or their ... See full document

... From the fit semivariograms, an ordinary kriging interpolation by points was performed to estimate the undetermined values and to elaborate the themed maps (Figures 2, 3, 4 and 5) for each attribute ... See full document

... ABSTRACT: The conversion of natural ecosystems into agricultural systems causes significant changes in soil properties associated with the growing deforestation in the ... See full document

... In the pH map (Figure 4e), circular areas centered on sample points (bull eyes effect) occur when the model has a spatial dependence radius smaller than the distance between ... See full document

... on the Scielo Brazil portal, with application of Geostatistics in Soil attributes, used and cited in SEIDEL & OLIVEIRA ...From the papers, the following ... See full document

... For the WTS application, the pots (10 kg capac- ity, containing 8 kg of degraded soil sieved to 5 mm) re- ceived, each other day, 360 g wet sludge in the D 100 and D 200 ... See full document

... areas of no tillage system where there is intense traffic of machines and minimal soil mobilization, the periodic monitoring allied on localized soil compaction represent important ... See full document

... shows the soil water content data for two dates and one depth, at which the average θ was maximum and minimum for the 17 observations ...presented in the form of one ... See full document

... shown the spatial distribution maps for variable K on the three studied soils obtained using the parameters of the fitted semivariograms (Table VI) for estimate unsampled values ... See full document