Figure 1.
Figure 2.
Figure 3.
Soil parameters before the field experiment in 2020–2022_
| Parameter | Value |
|---|---|
| pH KCl | 6.0 |
| Available P2O5 [mg kg−1] | 243.4 |
| Available K2O [mg kg−1] | 222.2 |
| Available MgO [mg kg−1] | 70.0 |
Meteorological conditions in 2020–2022_
| Month | 2020 | 2021 | 2022 | |||
|---|---|---|---|---|---|---|
| Precipitation [mm] | Air temperature [°C] | Precipitation [mm] | Air temperature [°C] | Precipitation [mm] | Air temperature [°C] | |
| January | 32.0 | 2.6 | 49.2 | −1.4 | 64.0 | 0.7 |
| February | 42.1 | 3.7 | 29.4 | −2.7 | 49.0 | 3.0 |
| March | 28.1 | 4.0 | 21.4 | 3.3 | 0.5 | 2.9 |
| April | 4.2 | 8.0 | 33.2 | 5.8 | 24.5 | 6.8 |
| Mai | 44.8 | 10.8 | 68.0 | 11.6 | 24.8 | 12.9 |
| June | 165.5 | 17.7 | 40.9 | 19.1 | 39.5 | 18.3 |
| July | 57.4 | 18.2 | 45.7 | 22.5 | 42.9 | 18.8 |
| August | 104.7 | 19.7 | 34.1 | 17.1 | 63.7 | 21.2 |
| September | 55.1 | 14.5 | 25.0 | 14.0 | 54.1 | 12.1 |
| October | 70.0 | 10.1 | 24.6 | 8.8 | 28.3 | 10.3 |
| November | 12.3 | 5.7 | 33.8 | 4.9 | 19.8 | 3.6 |
| December | 35.9 | 1.6 | 25.1 | −1.4 | 31.1 | 0.7 |
| Averages | 557.9 | 9.7 | 430.4 | 8.5 | 442.2 | 9.3 |
Percentage decrease in nitrate and nitrite content in potato tubers after storage during 6 months depending on genotype and earliness group
| Earliness Group | Varieties | Nitrate [%] | Nitrite [%] |
|---|---|---|---|
| Very early varieties | Impresja | 5.4 | 17.1 |
| Surmia | 6.5 | 22.4 | |
| Tacja | 6.5 | 21.2 | |
| Average | 6.1 | 20.2 | |
| Early varieties | Baltic Fire | 7.6 | 24.4 |
| Bohun | 4.8 | 16.7 | |
| Gardena | 7.5 | 23.2 | |
| Golden Marie | 4.8 | 14.3 | |
| Ignacy | 6.3 | 22.1 | |
| Ismena | 5.5 | 19.2 | |
| Magnolia | 5.5 | 19.5 | |
| Mia | 6.6 | 22.9 | |
| Stokrotka | 7.5 | 22.8 | |
| Wega | 5.4 | 17.2 | |
| Average | 6.1 | 20.2 | |
| Medium-early varieties | American Rose | 8.3 | 23.8 |
| Baltic Rose | 5.7 | 17.2 | |
| Jurek | 5.8 | 17.3 | |
| Mazur | 6.5 | 19.7 | |
| Tajfun | 8.4 | 23.8 | |
| Average | 6.9 | 20.3 | |