Data/hora: 13/06/2024 00:55:21

Provedor de dados: 	53	
País: 	Brazil	
Título: 	Geostatistical analysis of crop yield maps in a long term no tillage system	
Autores: 	Guedes Filho,Osvaldo; Vieira,Sidney Rosa; Chiba,Marcio Koiti; Grego,Célia Regina.	
Data: 	2010-01-01	
Ano: 	2010	
Palavras-chave: 	Spatial variability; Cross semivariogram; Management zones.	
Resumo: 	It is known, for a long time, that crop yields are not uniform at the field. In some places, it is possible to distinguish sites with both low and high yields even within the same area. This work aimed to evaluate the spatial and temporal variability of some crop yields and to identify potential zones for site specific management in an area under no-tillage system for 23 years. Data were analyzed from a 3.42 ha long term experimental area at the Centro Experimental Central of the Instituto Agronômico, located in Campinas, Sao Paulo State, Brazil. The crop yield data evaluated included the following crops: soybean, maize, lablab and triticale, and all of them were cultivated since 1985 and sampled at a regular grid of 302 points. Data were normalized and analyzed using descriptive statistics and geostatistical tools in order to demonstrate and describe the structure of the spatial variability. All crop yields showed high variability. All of them also showed spatial dependence and were fitted to the spherical model, except for the yield of the maize in 1999 productivity which was fitted to the exponential model. The north part of the area presented repeated high values of productivity in some years. There was a positive cross correlation amongst the productivity values, especially for the maize crops.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500003	
Editor: 	Instituto Agronômico de Campinas	
Relação: 	10.1590/S0006-87052010000500003	
Formato: 	text/html	
Fonte: 	Bragantia  v.69 suppl.0 2010	
Fonte: 	info:eu-repo/semantics/openAccess