Abstract
The effects of post-veraison regulated deficit irrigation (RDI) on vine water status, ripening, and quality of table grapes, cv. Muscat of Alexandria grown under a polyhouse and root-zone restriction condition were investigated in the Okayama University Experimental vineyard, Japan. From bud break to veraison all vines were irrigated to a soil moisture tension of 3 kPa at a depth of 15 cm, and were re-irrigated when soil moisture tension approached 15 kPa. Starting 10 d after veraison, 3 irrigation regimes were imposed: (1) Control (C): Re-irrigation immediately when soil moisture tension reached 15 kPa; (2) Moderate Deficit Irrigation (MDI): Re-irrigation 2 d after reaching a soil moisture tension of 15 kPa; and (3) Severe Deficit Irrigation (SDI): Re-irrigation 4 d after reaching a soil moisture tension of 15 kPa. Treatments were continued for 6 weeks until harvest. By the end of the experiment, as the vine water status decreased, only SDI vines were wilted or necrotic in the fruit-zone. In SDI vines, the cumulative effect of increased vine water deficit indicated by lower Ψl resulted in berries that were lower in firmness and acidity, with a small increase in aroma, and a higher TSS than control at harvest. The decrease in vine water status in the MDI treatment had a slight effect on berry ripening as compared with control while RDI had no effect on berry weight or juice pH at harvest.
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Claims 6
Claim · model-written summary
Only severe deficit irrigation (SDI) vines were wilted or necrotic in the fruit zone.
Verbatim
e1“By the end of the experiment, as the vine water status decreased, only SDI vines were wilted or necrotic in the fruit-zone”
t0“Response of Muscat of Alexandria table grapes to post-veraison regulated deficit irrigation in Japan”
Claim · model-written summary
SDI produced berries lower in firmness and acidity than control.
Verbatim
e2“In SDI vines, the cumulative effect of increased vine water deficit indicated by lower Ψl resulted in berries that were lower in firmness and acidity, with a small increase in aroma, and a higher TSS than control at harvest”
t0“Response of Muscat of Alexandria table grapes to post-veraison regulated deficit irrigation in Japan”
Claim · model-written summary
SDI gave a small increase in berry aroma compared with control.
Verbatim
e2“In SDI vines, the cumulative effect of increased vine water deficit indicated by lower Ψl resulted in berries that were lower in firmness and acidity, with a small increase in aroma, and a higher TSS than control at harvest”
t0“Response of Muscat of Alexandria table grapes to post-veraison regulated deficit irrigation in Japan”
Claim · model-written summary
SDI gave a higher TSS than control at harvest.
Verbatim
e2“In SDI vines, the cumulative effect of increased vine water deficit indicated by lower Ψl resulted in berries that were lower in firmness and acidity, with a small increase in aroma, and a higher TSS than control at harvest”
t0“Response of Muscat of Alexandria table grapes to post-veraison regulated deficit irrigation in Japan”
Claim · model-written summary
The MDI decrease in vine water status had a slight effect on berry ripening compared with control.
Verbatim
e3“The decrease in vine water status in the MDI treatment had a slight effect on berry ripening as compared with control”
t0“Response of Muscat of Alexandria table grapes to post-veraison regulated deficit irrigation in Japan”
Claim · model-written summary
RDI had no effect on berry weight or juice pH at harvest.
Not reportedComparator
Verbatim
e4“while RDI had no effect on berry weight or juice pH at harvest”
t0“Response of Muscat of Alexandria table grapes to post-veraison regulated deficit irrigation in Japan”
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