Grapevine root distribution in drip and microsprinkler irrigation.

BASSOI, L. H.; HOPMANS, J. W.; JORGE, L. A. de C.; ALENCAR, C. M. de; SILVA, J. A. M. e.; LUIS HENRIQUE BASSOI, CPATSA; JAN W. HOPMANS, UNIVERSITY OF CALIFORNIA; LUCIO ANDRE DE CASTRO JORGE, CNPDIA; CRISTINA MIRANDA DE ALENCAR, UNIVERSIDADE ESTADUAL PAULISTA; JOSÉ ANTONIO MOURA E SILVA.

Grapevine root distribution in drip and microsprinkler irrigation.

2003

Grape (Vitis vinifera L.) yield and its quality are dependent of the root system. Root distribution information is also valuable for soil and water management. An analysis of methods to evaluate the root distribution of grapevines for both, drip and microsprinkler irrigation in a Typic Acrustox is presented for the table grape cv. Italia grafted on the rootstock IAC-313, in Northeastern Brazil. Measured root parameters using the monolith method were root dry weight (Dw) and root length density (Lv), while root area (Ap) was estimated using the soil profile method in combination with digital image analysis. For both irrigation systems, roots were present to the 1 m soil depth and extended laterally to 1 m distance from the trunk, but grapevines irrigated by microsprinkler dhowed greater root presence as the distance from the trunk increased. Values of Ap were reasonably well correlated to Dw and Lv. However, correlation values were higher when fractional root distribution was used. The soil profile method in combination with image analysis techniques, allows proper grapevive root distribution evaluation.

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