Effect of rootstock on potassium (K) concentration in leaf petioles of Chardonnay (Sacramento Delta), Cabernet Sauvignon (Sacramento Delta), and Zinfandel (Amador County) grapes at bloom (B), veraison (V), and harvest (H). Shown are the means of observations covering 1995 to 1997.
| Leaf petiole potassium (% dry wt)a | ||||||
|---|---|---|---|---|---|---|
| Season | ||||||
| Rootstock | B | V | H | Bloom | Veraison | Harvest |
| aMeans of K concentration followed by the same lowercase letter or season (phenological stage) assigned the same lowercase letter do not differ significantly as determined by Duncan’s multiple range test (p < 0.05). | ||||||
| Cabernet | ||||||
| 5C | a | b | c | 2.23 e | 1.23 bc | 0.40 bc |
| 5BB | a | b | c | 1.84 f | 1.37 abc | 0.49 b |
| 420A | a | a | b | 1.36 g | 1.15 c | 0.34 cde |
| 110R | a | a | b | 1.67 f | 1.31 abc | 0.51 ab |
| 1103P | a | b | c | 2.21 e | 1.25 abc | 0.30 cde |
| 101-14 | a | b | c | 2.72 c | 1.42 ab | 0.39 bcd |
| 3309C | a | b | c | 2.21 e | 1.21 bc | 0.25 de |
| St. George | a | b | c | 2.52 d | 1.24 abc | 0.29 cde |
| 44–53 | a | b | c | 3.54 a | 1.40 ab | 0.64 a |
| 1616C | a | b | c | 2.59 cd | 1.48 a | 0.38 bcd |
| O39-16 | a | b | c | 2.07 e | 0.79 d | 0.31 cde |
| Harmony | a | b | c | 2.49 d | 1.20 bc | 0.31 cde |
| Freedom | a | b | c | 3.26 b | 1.19 bc | 0.45 bc |
| Ramsey | a | b | c | 1.87 f | 0.73 d | 0.19 e |
| All stocks | a | b | c | 2.33 | 1.21 | 0.38 |
| Zinfandel | ||||||
| 5C | b | a | c | 1.91 c | 2.25 a | 0.92 abcd |
| 5BB | b | a | c | 1.66 d | 2.06 abc | 0.91 abcd |
| 420A | b | a | c | 1.19 e | 1.53 e | 0.74 de |
| 110R | b | a | c | 1.48 d | 2.21 ab | 1.00 ab |
| 1103P | b | a | c | 1.57 d | 2.10 abc | 0.94 abc |
| 101-14 | a | b | c | 2.24 b | 1.92 cd | 0.76 cdec |
| 3309C | a | a | b | 1.98 c | 1.99 bcd | 0.66 ef |
| St. George | a | b | c | 2.39 b | 2.08 abc | 1.04 a |
| 44–53 | a | b | c | 2.66 a | 2.19 ab | 1.10 a |
| 1616C | a | a | b | 2.41 b | 2.28 a | 0.97 ab |
| O39-16 | a | b | c | 2.66 a | 1.96 cd | 1.02 a |
| Harmony | a | a | b | 2.30 b | 2.26 a | 0.82 bcde |
| Freedom | a | b | c | 2.74 a | 1.82 d | 0.81 bcde |
| Ramsey | a | b | c | 1.62 d | 1.33 f | 0.51 f |
| All stocks | a | b | c | 2.06 | 2.00 | 0.87 |
| Chardonnay | ||||||
| 5C | a | a | b | 2.40 f | 2.56 cde | 1.52 de |
| 5BB | a | a | b | 2.69 ef | 2.81 bc | 1.70 bcd |
| 420A | b | a | c | 1.66 g | 2.13 f | 0.70 g |
| 110R | b | a | c | 1.54 g | 2.45 def | 1.16 f |
| 1103P | b | a | b | 1.56 g | 2.30 ef | 1.58 cd |
| 101-14 | a | a | b | 2.86 def | 2.74 bcd | 1.49 de |
| 3309C | a | a | b | 2.89 def | 2.53 cde | 1.23 ef |
| St. George | a | a | b | 2.80 ef | 2.35 ef | 1.47 de |
| 44–53 | a | b | c | 4.47 a | 3.54 a | 1.92 b |
| 1616C | a | a | b | 3.98 ab | 3.64 a | 2.43 a |
| O39-16 | a | b | c | 3.39 cd | 2.92 b | 1.69 bcd |
| Harmony | a | a | b | 3.59 bc | 3.50 a | 2.45 a |
| Freedom | a | b | c | 3.17 cde | 2.62 bcde | 1.83 bc |
| Ramsey | a | a | b | 2.41 f | 2.12 f | 1.07 f |
| All stocks | a | a | b | 2.81 | 2.73 | 1.59 |