Eficiência da cokrigagem na estimativa da produtividade do café conilon

• Autor(a) principal: Quartzani, Waylson Zancanella [UNESP]
• Data de Publicação: 2011
• Outros Autores: Zimback, Celia Regina Lopes [UNESP], Landim, Paulo Milton Barbosa [UNESP], Oliveira, Rone Batista de [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.17224/EnergAgric.2011v26n1p113-125; http://hdl.handle.net/11449/137647
• topic: Cross-variogram; Kriging; Coffea canephora; Variograma cruzado; Kigagem; Coffea canephora

The objective of this research was to estimate the productivity (PRODUT) in sc/ha of coffee conilon through the technique of cokriging, using as covariate the production of humid coffee (PROD) in kg and compare the results with estimates obtained by kriging ordinary. The study was conducted in a commercial area of conilon coffee, Coffea canephora Pierre var. conilon, located in São Mateus Municipality, Espirito Santo State. For the field work was sampled the humid coffee production in a sampling grid irregular of 18.5 ha, 87 sampling points in the total. We also determined the production of dry coffee beans and coffee benefited 12% moisture, to obtain the PRODUT variable. After exploratory data analysis, which showed the correlation between variables in the order of 0.899, was performed variogram analysis. Were adjusted theoretical variograms to PROD and PRODUT and cross variogram between two variables. Finally we estimated the value of productivity, both by ordinary kriging as per cokriging. The validation of the estimation by cokriging not shows, however, significant gains in relation to validation by ordinary kriging.