Data/hora: 11/06/2024 15:45:12

Provedor de dados: | Ciência e Agrotecnologia
País: | Brazil
Título: | Pedotransfer functions for water retention in different soil classes from the center-southern Rio Grande do Sul State
Autores: | Santos,Walbert Júnior Reis dos; Curi,Nilton; Silva,Sérgio Henrique Godinho; Araújo,Elias Frank de; Marques,João José.
Data: | 2013-02-01
Ano: | 2013
Palavras-chave: | Permanent wilting point; Field capacity; Water retention curve.
Resumo: | Water retention in soil is used in many agronomic and environmental applications, but its direct measurement is time-consuming and expensive. Therefore, pedotransfer functions (PTFs) are alternatives to obtain this information faster and more economically. The objectives of this study were to generate and validate PTFs to estimate the water content at potentials of -33 kPa (field capacity) and -1500 kPa (permanent wilting point) for different soil classes from the central-south portion of Rio Grande do Sul State. The physical and chemical analyses database from soil surveys of the Celulose Riograndense Corp were used. The database is composed of particle size distribution (coarse and fine sand, silt and clay), soil organic matter, and water content data at the above mentioned potentials, besides other information concerning the behavior of the soil classes at field conditions. Firstly, the data were stratified by soil classes and depths, and then 70% of the data were separated for PTF generation and 30% for validation. PTFs were generated for each specific soil class and also general PTFs which were not stratified by soil class, by means of stepwise multiple regression. In most situations, PTFs for a specific soil class showed a better fit than the general PTFs. Proper adjustment of the data showed that the water retention values at potentials of -33 kPa and -1500 kPa can be estimated for the soils from the central-south portion of Rio Grande do Sul State that do not have such analyses through the use of PTFs.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000100006
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542013000100006
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.37 n.1 2013
Fonte: | info:eu-repo/semantics/openAccess