Spatial variability of leaf wetness duration in a 'Niagara Rosada' vineyard

Engenharia Agrícola

Jorge Lulu²  Paulo C. Sentelhas²  Mário J. Pedro Júnior¹  José R. M. Pezzopane¹  Gabriel C. Blain¹ 

[1] ,USP Esalq Department of Exact SciencesPiracicaba SP ,Brazil

关键词: dew;    rain;    flat plate wetness sensor;    orvalho;    chuva;    sensor de molhamento de placa plana;   

DOI  :  10.1590/S0100-69162008000100011

来源: SciELO

【 摘 要 】

Despite considerable efforts to develop accurate electronic sensors to measure leaf wetness duration (LWD), little attention has been given to studies about how is LWD variability in different positions of the crop canopy. In order to evaluate the influence of 'Niagara Rosada' (Vitis labrusca) grapevine structure on the spatial variability of LWD, the objective of this study was to determine the canopy position of the ‘Niagara RosadaÂ’ table grape with longer LWD and its correlation with measured standard LWD over turfgrass. LWD was measured in four different canopy positions of the vineyard (sensors deployed at 45º with the horizontal): at the top of the plants, with sensors facing southwest and northeast (Top-SW and Top-NE), and at the grape bunches height, with sensors facing southwest and northeast (Bottom-SW and Bottom-NE). No significant difference was observed between the top (1.6 m) and the bottom (1.0 m) of the canopy and also between the southwest and northeast face of the plants. The relationship between standard LWD over turfgrass and crop LWD in different positions of the grape canopy showed a define correlation, with R² ranging from 0.86 to 0.89 for all period, from 0.72 to 0.77 for days without rain, and from 0.89 to 0.91 for days with rain.

【 授权许可】

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