Table 4.
Juice composition at harvest recorded on Viognier B and Carignan N grapevines irrigated with treated wastewater and drinking water, and compared to a bloc not-irrigated in growing season 2017.
| Treatment | TSS | pH | Titratable | Tartaric | Malic | YAN | Na | K | Mg | Ca | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (Brix) | acidity | acid | acid | (mg/L) | (mg/L) | (mg/L) | (mg/L) | (mg/L) | |||
| (g/L) | (g H2SO4/L) | (g/L) | (g/L) | ||||||||
| Viognier B | |||||||||||
| DW-1 | 25.6 ab | 3.36 b | 3.88 ab | 7.58 bc | 2.48 b | 71 ab | 38 ab | 1 932 | 88 b | 130 | |
| DW-2 | 26.3 b | 3.36 b | 3.68 a | 7.00 a | 2.50 b | 56 a | 17 a | 1 825 | 84 ab | 113 | |
| TWW-C1 | 23.4 a | 3.31 b | 3.98 b | 7.30 ab | 2.51 b | 109 bc | 28 ab | 1 734 | 70 ab | 105 | |
| TWW-C2 | 25.7 ab | 3.38 b | 3.84 ab | 7.59 bc | 2.39 b | 115 c | 31 ab | 1 960 | 83 ab | 109 | |
| NI | 25.2 ab | 3.20 a | 4.01 b | 7.99 c | 1.81 a | 40 a | 49 b | 1 746 | 66 a | 107 | |
| Sig. | * | * | * | * | * | * | * | ns | * | ns | |
Carignan N |
|||||||||||
| DW-1 | 24.1 | 3.36 ab | 3.70 ab | 7.02 ab | 2.35 a | 48 a | 38 a | 1 845 a | 63 | 65 | |
| DW-2 | 23.7 | 3.36 ab | 3.55 a | 6.78 a | 2.38 a | 59 a | 44 ab | 1 914 a | 53 | 58 | |
| TWW-C1 | 24.3 | 3.43 b | 3.62 a | 7.36 ab | 2.46 a | 52 a | 51 abc | 2 148 b | 66 | 88 | |
| TWW-C2 | 23.9 | 3.38 ab | 4.11 b | 7.27 ab | 3.03 b | 79 b | 60 c | 2 017 ab | 53 | 60 | |
| NI | 24.4 | 3.31 a | 3.96 ab | 7.67 b | 2.33 a | 67 ab | 54 bc | 1 982 ab | 55 | 52 | |
| Sig. | ns | * | * | * | * | * | * | * | ns | ns | |
Data are means of each treatment. Each value represents n = 3 for treatment. Different letters within columns for each grapevine indicate a significant difference at p > 0.05 (LSD test). *Denote a significant difference between treatments. TSS, total soluble solids; YAN, yeast assimilable nitrogen; ns, not significant; DW, drinking water; TWW-C treated wastewater quality C; NI, non-irrigated; 1, standard irrigation; 2, reinforced irrigation.
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