Table 9.
Seasonal variations of the exchangeable soil calcium content in the experimental plots of different cultivars in 2016, Mmol 100 g−1.
| Treatments | 30.05 | 30.06 | 28.07 | 30.08 | 29.09 |
|---|---|---|---|---|---|
| cv. “Zhigulevskoye” | |||||
| Control N20P15 | 22.2 | 24.2 | 24.4 | 23.5 | 22.2 |
| N20P15K25 | 20.5 | 26.4 | 24.4 | 24.3 | 23.0 |
| N20P15K35 | 21.5 | 21.9 | 24.0 | 20.9 | 20.7 |
| N20P15K45 | 21.0 | 24.6 | 29.4 | 22.5 | 23.0 |
| LSD05 | 2.1 | 1.9 | 2.8 | 2.2 | 1.7 |
| cv. “Lobo” | |||||
| Control N20P15 | 17.8 | 15.5 | 19.6 | 20.1 | 18.4 |
| N20P15K25 | 17.9 | 15.7 | 21.6 | 20.6 | 21.3 |
| N20P15K35 | 16.7 | 13.8 | 20.1 | 21.7 | 22.1 |
| N20P15K45 | 17.3 | 16.8 | 18.3 | 18.2 | 23.2 |
| LSD05 | 1.4 | 1.9 | 2.3 | 2.0 | 2.4 |