Table 10.
Seasonal variations of the exchangeable soil calcium content in the experimental plots of different cultivars in 2017, Mmol 100 g−1.
| Treatments | 30.05 | 30.06 | 27.07 | 30.08 | 28.09 |
|---|---|---|---|---|---|
| cv. “Zhigulevskoye” | |||||
| Control N20P15 | 19.6 | 18.8 | 19.1 | 18.2 | 18.8 |
| N20P15K25 | 18.7 | 18.6 | 17.2 | 18.2 | 18.2 |
| N20P15K35 | 19.4 | 18.2 | 17.5 | 18.4 | 17.9 |
| N20P15K45 | 18.2 | 17.9 | 17.0 | 19.3 | 17.3 |
| LSD05 | 1.8 | 1.6 | 2.0 | 1.5 | 1.5 |
| cv. “Lobo” | |||||
| Control N20P15 | 15.7 | 15.6 | 21.4 | 20.9 | 20.1 |
| N20P15K25 | 15.9 | 15.7 | 21.0 | 21.4 | 22.2 |
| N20P15K35 | 16.3 | 20.1 | 21.7 | 22.1 | 19.9 |
| N20P15K45 | 15.5 | 20.6 | 20.1 | 17.6 | 20.2 |
| LSD05 | 1.4 | 1.6 | 1.8 | 1.6 | 2.2 |