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established between the plant and the environment in which it is found, and coupling is responsible for the intensity of mass and energy flux between the plant-atmosphere interaction. The objective of this study was to analyze the coupling variation (Ω) of maize grown in summer and autumn in order to understand the interaction between vegetation and atmosphere. Two experiments were conducted, the first in the fall season and the second in the summer, both installed in the municipality of Piracicaba-SP. The coupling factor (Ω) was calculated by the equation proposed by McNaughton and Jarvis (1983) and the transpiration data for the autumn period were estimated using the CERES-MAIZE model. It was verified the coupling of the vegetation with the atmosphere in the fall harvest due to the joint action between aerodynamic and radiative components in the control of the exchange of water vapor with the atmosphere; In the summer crop there was decoupling due to the occurrence of high temperatures, which favored the metabolic activities of the plant. It was concluded that in the autumn harvest the coupling of corn plants with the atmosphere occurred with the increase of wind speed, reduction of aerodynamic resistance and leaf boundary layer, with decrease in transpiration; Temperatures between 25 and 30 ° C favored the decoupling of corn plants with the atmosphere in the summer season.

Regime de acoplamento planta-atmosfera em lavouras de milho cultivadas em duas épocas