ISHS Acta Horticulturae 646: International Symposium on Irrigation and Water Relations in Grapevine and Fruit Trees
INFLUENCE OF PLANT DENSITY AND WATER REGIME ON SOIL WATER USE, WATER RELATIONS AND PRODUCTIVITY OF TRELLIS-TRAINED TEMPRANILLO GRAPEVINES |
| Authors: | J. Yuste, J.A. Rubio, A. Péez |
| Keywords: | Water consumption, LAI, dry matter, leaf water potential, irrigation, TDR. |
| Abstract:
This study analyzes the influence of planting density and water regime on soil water content, predawn leaf water potential, leaf development and global productivity (or total dry matter) of Tempranillo grapevines in the Duero region (Spain) during three years. The plants grafted onto 110-R were trained in a vertical shoot positioning trellis and NorthEast-SouthWest orientated (N-S + 25º). The vines were two buds spur pruned, maintaining the same number of buds per hectare in all the treatments, 39600. Two different planting densities were studied: low density, with spacing of 2.7 x 1.4 m (2645 plants/ha), and high density, with 2.2 x 1.15 m (3953 plants/ha). The water regime was studied by comparing non-irrigated plants and drip irrigated plants, applying 40% of ET in the irrigated treatment from June to September. The increase of planting density has contributed to a lightly higher soil water consumption that has resulted in a higher LAI, in predawn leaf water potentials slightly more negative during some periods of the season and in a bigger global productivity of the high density plants, whereas the grape production has been slightly reduced. The irrigation has permitted a better availability of the soil water content and a considerable increase of the water consumption. This consumption has caused a lower stress to the plants, higher leaf water potentials, bigger LAI and higher grapevine productivity. The planting density did not affect the relations between dry matter and water consumption, whereas the high density was higher in water consumption per vine yield unit than the low density. The irrigation provokes a bigger water consumption which is translated into a bigger grape productivity, although the unitary production efficacy by volume of water consumption is bigger in non-irrigated than in irrigated vines. | |
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