Table 17.
The effect of different potassium fertilization rates and fertigation approaches on the K/Ca ratio in apple fruits.
| Group | Treatments | cv. “Zhigulevskoye” | cv. “Lobo” |
|---|---|---|---|
| 2016 | |||
| Control N20P15 | 22.6 | 16.0 | |
| G1 (unchangeable K rates) |
N20P15K25 | 31.1 | 25.3 |
| N20P15K35 | 28.1 | 26.5 | |
| N20P15K45 | 29.1 | 27.9 | |
| G2 (season adjusted K rates) |
N20P15K20 | 23.3 | 17.8 |
| N20P15K25 | 22.9 | 21.5 | |
| N20P15K30 | 23.7 | 20.3 | |
| LSD05 | 1.7 | 1.3 | |
| 2017 | |||
| Control N20P15 | 14.9 | 18.3 | |
| G1 (unchangeable K rates) |
N20P15K25 | 28.3 | 21.5 |
| N20P15K35 | 30.5 | 27.6 | |
| N20P15K45 | 25.4 | 25.9 | |
| G2 (season adjusted K rates) |
N20P15K30 | 16.7 | 17.9 |
| N20P15K40 | 15.0 | 17.3 | |
| N20P15K50 | 16.3 | 22.8 | |
| LSD05 | 1.5 | 1.3 | |