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	Provedor de dados Scientia Agricola (1) Rev. Bras. Ciênc. Solo (1) Autor Anjos,Lúcia Helena Cunha dos (1) Assad,Eduardo Delgado (1) Beutler,Sidinei Julio (1) Bocca,Felipe Ferreira (1) Boschi,Raquel Stucchi (1) Lopes-Assad,Maria Leonor Ribeiro Casimiro (1) Menezes,Michele Duarte de (1) Pereira,Marcos Gervasio (1) Tassinari,Wagner de Souza (1) Valladares,Gustavo Souza (1) Mais... Palavra-chave Soil database (2) Box-cox transformation (1) Model evaluation (1) Multiple linear regression (1) Pedotransfer functions (1) REC curve (1) Tropical soil (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2018 (1) 2017 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Bulk Density Prediction for Histosols and Soil Horizons with High Organic Matter Content Rev. Bras. Ciênc. Solo Beutler,Sidinei Julio; Pereira,Marcos Gervasio; Tassinari,Wagner de Souza; Menezes,Michele Duarte de; Valladares,Gustavo Souza; Anjos,Lúcia Helena Cunha dos. ABSTRACT Bulk density (Bd) can easily be predicted from other data using pedotransfer functions (PTF). The present study developed two PTFs (PTF1 and PTF2) for Bd prediction in Brazilian organic soils and horizons and compared their performance with nine previously published equations. Samples of 280 organic soil horizons used to develop PTFs and containing at least 80 g kg-1 total carbon content (TOC) were obtained from different regions of Brazil. The multiple linear stepwise regression technique was applied to validate all the equations using an independent data set. Data were transformed using Box-Cox to meet the assumptions of the regression models. For validation of PTF1 and PTF2, the coefficient of determination (R2) was 0.47 and 0.37, mean error... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pedotransfer functions; Multiple linear regression; Box-cox transformation; Soil database. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100309 How accurate are pedotransfer functions for bulk density for Brazilian soils? Scientia Agricola Boschi,Raquel Stucchi; Bocca,Felipe Ferreira; Lopes-Assad,Maria Leonor Ribeiro Casimiro; Assad,Eduardo Delgado. ABSTRACT: The aim of this study was to evaluate the performance of pedotransfer functions (PTFs) available in the literature to estimate soil bulk density (ρb) in different regions of Brazil, using different metrics. The predictive capacity of 25 PTFs was evaluated using the mean absolute error (MAE), mean error (ME), root mean squared error (RMSE), coefficient of determination (R2) and the regression error characteristic (REC) curve. The models performed differently when comparing observed and estimated ρb values. In general, the PTFs showed a performance close to the mean value of the bulk density data, considered as the simplest possible estimation of an attribute and used as a parameter to compare the performance of existing models (null model). The... Tipo: Info:eu-repo/semantics/article Palavras-chave: REC curve; Model evaluation; Soil database; Tropical soil. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100070 Registros recuperados: 2 Primeira ... 1 ... Última

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