Data/hora: 10/06/2024 16:12:08

Provedor de dados: 	63	
País: 	Brazil	
Título: 	Geostatistics as a basis to the CMLS pesticide simulation model with validation in soil columns	
Autores: 	Nicolella,Gilberto; Perez Filho,Archimedes; Souza,Manoel Dornelas de; Ferracini,Vera Lúcia.	
Data: 	2005-01-01	
Ano: 	2005	
Palavras-chave: 	Microbasin; Sugar cane; Tebuthiuron; Variography; Kriging.	
Resumo: 	The use of simulation models is probably the most efficient means for predicting the behavior of pesticides in the soil-plant-water system. The CMLS (Chemical Movement in Layered Soils) simulation model for predicting the fate of pesticides was used for studying the behavior of tebuthiuron, a herbicide used in sugar cane crops, from a sampling grid with 111 sampling points 200 m apart from one another and encompassing three types of soil: Ustic Quartzipsamment, Rhodic Hapludox and Typic Hapludox, all with medium and clay textures. The 373 points assessed by the simulator, generated from samples coming from the original grid and through the geostatistical methods of variography and ordinary kriging, returned the depth values reached by the herbicide after six years of simulation (1989-1995). For the Ustic Quartzipsamment, tebuthiuron, in four simulated points, returned depth values above 43 m and a maximum 50 m, with a certain amount of the product still remaining in the soil that was close to 10% of the original 1.1 kg ha-1 applied. Results from the column assay used for validating the model showed that the model overestimated the depth reached by the herbicide in 6.6% as compared to the column value for the Ustic Quartzipsamment. The depth was underestimated in 4.5% and 20% for the Typic Hapludox and the Rhodic Hapludox, respectively. These data support the adequacy of the model for assessing the fate of tebuthiuron in both Ustic Quartzipsamment and Typic Hapludox.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100010	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162005000100010	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.62 n.1 2005	
Fonte: 	info:eu-repo/semantics/openAccess