[PDF] Top 20 PEDOTRANSFER FUNCTIONS RELATED TO SPATIAL VARIABILITY OF WATER RETENTION ATTRIBUTES FOR LOWLAND SOILS

... performance of the gravimetric point PTFs of Arruda et ...set of tropical soils composed of 249 profiles (a total of 771 horizons) coming from 22 countries (Data base ...one ... See full document

... number of predictor variables. This makes it faster and cheaper to obtain results as it uses properties routinely obtained in soil analysis ...similar to ANN in estimating soil water ...those ... See full document

... described functions that related easily measurable soil attributes, such as particle size distribution and organic matter, to the soil hydraulic characteristics (BOUMA; LANEN, ...difficult ... See full document

... State soils demonstrated that for regions where the pedological and mineralogical variability is expressive (Streck et ...number of data of all soils is compiled in a sole model. Due ... See full document

... used to determine the predictors of a PTF or the estimated variable (ρb) also seems to af- fect their ...source of variability, either PTF-related or soil-related, that ... See full document

... potentials of the SWRC. This fact is related to the low capacity of the function in estimating the shape parameters of the SWRC (α and n), responsible for the accuracy of the ... See full document

... parcel of arable land used for growing rice, a crop mainly cultivated in lowlands by semi aquatic ...quantities of water for irrigation. Flooding provides water, essential in order to ... See full document

... descriptions of spatial variability. The objective of this study was to assess the spatial and temporal variability of soil water ...equipment to a 20 ... See full document

... large spatial variability of the conditions of soil acidity, even in apparently homogeneous crop ...According to Pierce & Novak (1999), in the calculation of the lime ... See full document

... number of functions with dependencies over the total of ...number of functions with directives, this number grows ...14.14% of its functions. However, 82.35% of its ... See full document

... the spatial variability of soil characteristics may improve the efficiency of agricultural input ...purpose of this study was to determine homogeneous zones for liming ... See full document

... distribution of soil nutrients in the Tapajós National Forest using geostatistics, and adjusted the exponential model for pH (H 2 O) and zinc, the Gaussian model for phosphorus and copper, and the spherical model ... See full document

... (CCC) of measured versus simulated accumulated solute loads leached at ...(only pedotransfer functions); after calibration of 2 water-related crop parameters; after calibration ... See full document

... soil water available to crops is defined by specific values of water potential ...estimation of hydro-physical limits, identified as permanent wilting point (PWP) and field capacity ... See full document

... importance of the four main predictors (soil properties SB, OC, Clay and pH, ...properties to fill gaps in horizons with missing ρ b data and second, use envi- ronmental covariates to obtain ... See full document

... presence of a compact soil layer detected at the ...intending to rotate crops in lowland areas cultivated with irrigated ...presence of this less permeable layer intensifies OD by keeping the ... See full document

... ing to Vieira et ...close to 1.0. It was possible to plot many soil attributes on one graph along with their proximity when elected, indicating a similarity of range along landscapes ... See full document

... the attributes related to total organic carbon ...Responses to the factor “management” were observed for TOC, POC and MAOC (Table ...accumulation of organic material on soil surface ... See full document

... attributed to each soil mapping unit using Irish SIS into the ...data to produce a soil carbon map to 1 ...used to produce a drainage map for the ...in soils, areas prone to ... See full document

... mean of 10 % and significance level of 0.01) to a large number of subsamples, ...error of 20 % around the mean and level of significance of ...up to 188 subsamples ... See full document