The use of cotton productivity sensors is recent in Brazil. Variability of physical and chemical properties of soil opens the possibility of delimiting homogeneous zones in crop fields. Relationships between these properties and cotton yield can be obtained, indicating the crop potential for each soil condition. The objective of this study was to establish relationships between soil attributes that have spatial variability and its interference in cotton yield. The experiment was carried out in 56.1 ha, in Cristalina, GO, with cotton. Soil samples were collected on a regular grid of 80 x 80 m for evaluation of chemical and physical attributes and apparent electrical conductivity of soil (ECa). The cotton yield was measured by machines equipped with flow sensor during 2010/11 and 2011/12 cropping seasons. Cotton yield showed strong spatial dependence and has negative correlation with ECa and pH CaCl2. The ECa was an useful tool to identify the variability of acidity and soil nutrients in this study, allowing to delimit homogeneous zones to a distinct management.
precision agriculture; yield mapping; apparent electrical conductivity
