Variabilidade espaço-temporal de nutrientes foliares e produtividade do café conilon
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Data
2014-02-27
Autores
Cezana, Diego Capucho
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Universidade Federal do Espírito Santo
Resumo
Precision agriculture brought tools that allow us to consider the plants a crop, not as
a homogeneous environment, but in all its variability. Tools such as kriging the
semivariogram and enable the construction of maps by interpolation of sample points
that have spatial dependency between them, thereby causing, if known points in the
sampling grid , without the need for sampling. The objective of applying geostatistics
to coffee crop and investigate the spatial variability of attributes related to plant
productivity, foliar N, P, K, Ca, Mg, Fe, Zn, Cu, Mn and B making estimates using the
kriging technique presumes spatial variability and identify interrelationships of these
attributes in space. The study was conducted on a commercial crop Conilon coffee
variety called Bamburral, under irrigation, micro spray, in São Mateus state of
Espírito Santo - Brazil. The experimental area has dimensions of 100x115 m, where
we sampled a grid of 100 points with a minimum distance of 2 m between them. The
crop productivity was estimated by harvesting a plant every sample point. The
attributes studied showed moderate spatial dependence structure, the spherical
model being the best fit for all variables. The greatest variability was obtained by
productivity in season 1 (CV 66.66%) and the lowest for the season 1 also N (CV
9.21%). Both variables were normally distributed, with a range of 14,31 and 44,0 m,
respectively. The coefficient of variation of the micronutrients Fe, Zn, Cu, Mn and B in
the two seasons we observed a moderate CV, being in season 1, following 30,77;
19,02; 37,36; 32,75 and 37,21 respectively in season 2 the following 37,62; 32,20;
24,62; 32,30; 17,30 respectively. The coefficient of variation of the micronutrients Fe,
Zn, Cu, Mn and B in the two periods was classified as moderate. The K, Ca, Mg and
S macronutrients in season 1 were classified as moderate while the N and P showed
low CV, then 2 moderate CV was presented by P, Ca, Mg and S and low CV was
presented by N and K.
Descrição
Palavras-chave
Variogram , Kriging , Coffea canephora , Variograma , Precision agriculture , Café conilon
Citação
CEZANA, Diego Capucho. Variabilidade espaço-temporal de nutrientes foliares e produtividade do café conilon. 2014. 68 f. Dissertação (Mestrado em Agricultura Tropical) - Programa de Pós-Graduação em Agricultura Tropical, Universidade Federal do Espírito Santo, Sâo Mateus, 2014.