A importância da monitorização do clima, solo e planta para a gestão da rega na vinha (Vitis vinifera L.)

Abstract

The following thesis is included in the European project Innovine (granted agreement nº FT7-311775), which include the collaboration of several institutions with a long range of scientific areas, with the purpose of presenting results of an essay in an Alentejo sub-region – Reguengos. In this essay several sensors were installed for the use of phytomonitorization as a tool to monitor two types of deficit irrigation, RDI – Regulated Deficit Irrigation; SDI – Sustainable Deficit Irrigation. This phytomonitorization will be important in order to understand some determining physiological parameters of a vineyard in response to water stress, using the variety “Touriga Nacional”. For both types of deficit irrigation a representative grapevine was selected, on which the following phytomonitoring sensors were installed - sap flow, leaf and berry temperature and trunk diameter, canopy humidity). Leaf temperatures ranged from 6,1ºC to 48,7ºC in RDI and from 9,2ºC to 47,3ºC in SDI. For the berry temperatures the temperature ranged from 6,1ºC to 49ºC in both modalities. As possible estimators for physiological parameters, when analyzing a single irrigation period, we obtained high determination coefficients for the leaf temperature (R2=0,90 and R2=0,76) when related with the ψb. As possible estimators of ψfd parameters we obtained high determination coefficients for air temperature (R2=0,0,81 and R2=0,78). For the sap flow the determination coefficients were R2=0,63 and R2=0,60 after irrigation and R2=0,80 and R2=0,76 before irrigation. Also for the leaf temperature vs leaf water potential we obtained R2=0,67 and R2=0,67 after irrigation and R2=0,52 and R2=0,59 before irrigation