02070naa a2200265 a 450000100080000000500110000800800410001902400330006010000160009324501220010926000090023150000730024052012080031365000290152165000220155065000220157265000120159465300230160665300200162965300190164965300240166865300170169270000260170977300690173510571112017-10-05       2017    bl uuuu     u00u1 u    #d7 a10.7764/rcia.v44i1.16222DOI1 aBERETTA, A.  aUSLE/RUSLE K-factors allocated through a linear mixed model for Uruguayan soilsbresarch note.h[electronic resource]  c2017  aArticle history: Received June 06, 2016.// Accepted January 17, 2017  aAbstract: Soil erosion byrainfall is a process that demands management, both for the prevention of excessive soil erosion and for the protection of the quality of freshwater bodies. Erosion coefficients (K-factors) of the universal soil loss equation (USLE)/revised USLE (RUSLE) model were assigned to 99 mapped Uruguayan soil types at 1:1,000,000 scale. This work developed a linear mixed model (LMM) with 79 soils with assigned K-factors, in which the following variables were considered: soil taxonomy, chemical composition, and parent material. The developed LMM had an R2=0.86, in which the soil taxonomy (p<0.0001), parent material (p=0.0174), clay (p=0.0005) and sand (p=0.017) contents had significant statistical effects. The prediction capacity of this model was assessed with 10 soils not previously used in development of the LMM with assigned K-factors. The prediction assessment had an R2=0.84 and a mean error of 9.08% of the mean K-factor value. The LMM developed was used for the allocation of K-factors to soils mapped at a 1:20,000-resolution. Thus, the use of LMM increased the soil area with assigned K-factors from 111,822 km2 (at a scale of 1:1,000,000) to 174,132 km2 (1:20,000).  aCLASIFICACIÓN DE SUELOS  aQUIMICA DEL SUELO  aTEXTURA DEL SUELO  aURUGUAY  aEROSIÓN DEL SUELO  aPARENT MATERIAL  aSOIL CHEMISTRY  aSOIL CLASSIFICATION  aSOIL TEXTURE1 aCARRASCO-LETELIER, L.  tCiencia e Investigación  Agrariagv. 44, n.1 ,p. 100-112, 2017.