Precision agriculture applied to soybean crop: Part II – Temporal stability of management zones

Abstract

Precision farming techniques have potential applications in the Brazilian Savannah owing to the spatial variability in crop yield. The objective of this study was to evaluate the temporal stability of management zones based on the measurement of apparent soil electrical conductivity (ECa). The study was performed in a field located in the Brazilian Savannah. During the 2011/2012 crop season, ECa was measured at 160 sampling points in a 47-ha area. ECa values were then grouped into classes using the fuzzy kmeans algorithm and fertilizers were applied to the soybean crop (BMX Potencia RR) in the 2012/2013 and 2013/2014 crop seasons according to soil analysis for each class. ECa was also measured in the 2012/2013 and 2013/2014 crop seasons and the values were grouped into classes, and the maps of apparent soil electrical conductivity classes were compared using kappa coefficients. Apparent soil electrical conductivity was significant and positively correlated with each pair of crop seasons for all three seasons analyzed. The cluster analysis indicated the presence of two management zones in 2012. These management zones were adopted for fertility management in the 2012/2013 and 2013/2014 crop seasons. A comparison of the 2012 and 2013 management zone maps, based on the kappa coefficient, showed that they remained stable. The use of kappa coefficients was found to be a promising tool in the analysis of the temporal stability of management classes.

Adoção Da Agricultura De Precisão Na América Do Sul: O Estado Da Arte Em Argentina, Brasil E Colômbia

“…OR "precision livestock production" OR "precision livestock farming" OR "precision irrigation" AND Tabela 6 -Ferramentas de agricultura de precisão na América do Sul (2008). (BOTTEGA et al, 2017;DE-MATTÊ et al, 2017;MACHADO;LANÇAS, 2016;GEBLER et al, 2015;KRAMER et al, 2014;NANNI et al, 2011).…”

Characterization of the soil compaction based on the mapping of the apparent electrical conductivity

“…Studies have shown a correlation between the apparent soil electrical conductivity (CEa) and chemical and physical attributes of the soil (MORAL et al, 2010;RODRÍGUEZ-PÉREZ et al, 2011;CORASSA et al, 2016) that influence the crop yield. The measurement of ECa is faster and cheaper than traditional soil sampling and laboratory analysis (BOTTEGA et al, 2017) which makes it a potential variable in MZ delimitation. In addition, ECa has been used as an indirect estimator of the variability existing in a production field (CORWIN;LESCH, 2003).…”