Table 1.
Grape berry weight (g) of Touriga Nacional and Touriga Franca varieties during different times of sampling until maturation.
| Variety/Sampling Time | Control | Kaolin 5% | Potassium Silicate (0.1%) | Potassium Silicate (0.05%) |
|---|---|---|---|---|
| Touriga National | ||||
| 26/07 | 0.68 ± 0.06 aA | 0.65 ± 0.06 aA | 0.54 ± 0.01 aA | 0.57 ± 0.04 aA |
| 02/08 | 0.73 ± 0.05 aA | 0.63 ± 0.08 aA | 0.59 ± 0.02 aA | 0.62 ± 0.14 abA |
| 09/08 | 0.81 ± 0.05 ab | 0.70 ± 0.04 aA | 0.62 ± 0.09 aA | 0.67 ± 0.11 abA |
| 17/08 | 1.00 ± 0.08 bcA | 1.06 ± 0.01 bA | 0.96 ± 0.02 bA | 0.86 ± 0.12 abA |
| 23/08 | 0.99 ± 0.02 bcA | 1.06 ± 0.03 bA | 1.04 ± 0.11 bA | 0.92 ± 0.04 abA |
| 07/09 | 1.25 ± 0.00 dA | 1.11 ± 0.15 bA | 0.94 ± 0.02 bA | 1.10 ± 0.21 bA |
| 20/09 | 1.19 ± 0.09 cdA | 1.18 ± 0.11 bA | 1.09 ± 0.13 bA | 1.05 ± 0.13 abA |
| Touriga Franca | ||||
| 26/07 | 1.01 ± 0.11 aA | 0.92 ± 0.04 aA | 0.92 ± 0.19 aA | 1.04 ± 0.02 aA |
| 02/08 | 1.101 ± 0.33 abA | 1.19 ± 0.01 aA | 1.12 ± 0.21 abA | 1.05 ± 0.15 aA |
| 09/08 | 1.51 ± 0.16 abcA | 1.20 ± 0.41 bA | 1.16 ± 0.23 abA | 1.05 ± 0.48 aA |
| 17/08 | 1.59 ± 0.04 abcA | 1.54 ± 0.01 abA | 1.60 ± 0.17 bA | 1.28 ± 0.080 aA |
| 23/08 | 1.69 ± 0.02 bcA | 1.47 ± 0.17 abA | 1.43 ± 0.12 abA | 1.32 ± 0.04 aA |
| 07/09 | 1.58 ± 0.03 abcA | 1.52 ± 0.03 abA | 1.41 ± 0.03 abA | 1.43 ± 0.14 aA |
| 20/09 | 2.01 ± 0.20 cA | 1.59 ± 0.19 abA | 1.56 ± 0.04 baA | 1.59 ± 0.02 aA |
Means (average ± standard deviation) within a column followed by different lower case letters are significantly different (p < 0.05). Values with the same capital letter on the same line for each grape variety and sampling data are not significantly different from each other at p < 0.05.