Articles
USE OF LEAF TEMPERATURE TO EVALUATE GRAPEVINE (Vitis vinifera) YIELD AND QUALITY RESPONSE TO IRRIGATION
Article number
537_48
Pages
407 – 413
Language
Abstract
In the Emilia Romagna region, Northern Italy – Po valley, the irrigation of grapevine was often considered as an exceptional practice only necessary in very dry years.
Nevertheless water supply was associated with the risk of losses in terms of must sugar content and wine quality.
The aim of the trial was to evaluate the effectiveness of leaf temperature and crop water stress index (CWSI) for irrigation scheduling of the grapevine.
In the years from 1988 to 1992 the leaf temperature was measured using an infrared thermometer on a vineyeard of Trebbiano grafted on SO4. The non water stressed baseline for the grapevine (Trebbiano di Romagna/SO4) in this area was determined.
Four irrigation regimes were compared: Rainfed; 50%, 100% and 150% of ETc replenishment.
As a result of the water supply, the leaf temperature in the irrigated treatments was different than the rainfed, with an average decrease of about 2°C. In dry years, when the rainfed CWSI exceeded threshold of 0.30-0.35, the yield and the must quality decreased in comparison with irrigated treatments.
In conclusion, we conclude that infrared thermometry can be used for the irrigation scheduling of the grapevine.
Our results show that the vineyard can tolerate water stress not exeeding CWSI 0.4 without significant losses in terms of yield or must quality.
Nevertheless water supply was associated with the risk of losses in terms of must sugar content and wine quality.
The aim of the trial was to evaluate the effectiveness of leaf temperature and crop water stress index (CWSI) for irrigation scheduling of the grapevine.
In the years from 1988 to 1992 the leaf temperature was measured using an infrared thermometer on a vineyeard of Trebbiano grafted on SO4. The non water stressed baseline for the grapevine (Trebbiano di Romagna/SO4) in this area was determined.
Four irrigation regimes were compared: Rainfed; 50%, 100% and 150% of ETc replenishment.
As a result of the water supply, the leaf temperature in the irrigated treatments was different than the rainfed, with an average decrease of about 2°C. In dry years, when the rainfed CWSI exceeded threshold of 0.30-0.35, the yield and the must quality decreased in comparison with irrigated treatments.
In conclusion, we conclude that infrared thermometry can be used for the irrigation scheduling of the grapevine.
Our results show that the vineyard can tolerate water stress not exeeding CWSI 0.4 without significant losses in terms of yield or must quality.
Authors
S. Anconelli, A. Battilani
Keywords
Vitis vinifera, grapevine, CWSI, Baseline, irrigation scheduling, quality.
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