Figure 1.
Fruits of strawberry cultivars: (A): ‘Albion’; (B): ‘San Andreas’; (C): ‘Portola’.
Table 1.
Soil properties of the study area.
| Parameter | Value | Comment |
|---|---|---|
| pH | 7.86 | Alkali |
| Lime | 16.36% | High chalky |
| Organic matter | 1.82% | Poor |
| Structure | 64.90% | Clay loam |
| Salinity | 0.051% | Without salt |
| P2O5 (phosphorus) | 10.72 ppm | Medium |
| K2O (potassium) | 179.79 ppm | High |
| Ca (calcium) | 43.50 ppm | Rich |
| Mg (magnesium) | 406.50 ppm | Rich |
| Fe (iron) | 1.72 ppm | Little |
| Zn (zinc) | 1.16 ppm | Very high |
| Mn (manganese) | 0.78 ppm | Insufficient |
| Cu (copper) | 2.54 ppm | Sufficient |
Figure 2.
Impacts of different planting times on the fruit width, length, weight and firmness of strawberry fruits and total yield of per plant, SD of plants (A): fruit width (mm), (B): fruit length (mm), (C): FW (g), (D): yield (g · plant-1), (E): fruit firmness (kg · cm-2) and (F): stem diameter (mm)). FW, fruit weight; SD, stem diameter.
Figure 3.
Values of soluble solid concentration, pH, EC, TA and chlorophyll of strawberries (A): SSC (%), (B): pH (%), (C): EC, (D): TA (%), and (E): chlorophyll (SPAD)). EC, electrolyte conductivity; TA, titrable acidity.
Table 2.
Mean comparison of the effect of different planting dates on the SSC/TA ratio (ripening index) of different cultivars of strawberry.
| Planting time | Strawberry cultivars | SSC/TA |
|---|---|---|
| 05.04.19 | Albion | 15.8 a |
| Portola | 12.61 d | |
| San Andreas | 14.8 b | |
| 20.04.19 | Albion | 13.06 c |
| Portola | 12.6 d | |
| San Andreas | 14.58 b |
Figure 4.
Values of colours of strawberry fruits [(A): L, (B): C and (C): h].
Figure 5.
Values of ascorbic acid (A), total phenolic compound (B) and total anthocyanin (C).
Figure 6.
Hierarchical clustering for grouping study cultivars and planting dates.
Figure 7.
Correlation analysis of the study parameters and cultivars. EC, electrolyte conductivity; FW, fruit weight; SD, stem diameter.
Figure 8.
PCA biplot analysis of the study parameters, cultivars and planting dates.