Table 5.
Seasonal differences in nitrate levels regarding vegetable type in Rijeka.
| Sample type: RIJEKA | N | Arithmetic mean | SD | Standard error | t | P | |
|---|---|---|---|---|---|---|---|
| Lettuce | Nitrate content in mg/kg in spring | 5 | 665.80 | 248.32 | 111.05 | -0.7 | 0.522 |
| Nitrate content in mg/kg in autumn | 5 | 756.40 | 277.82 | 124.24 | |||
| Spinach | Nitrate content in mg/kg in spring | 5 | 1215.80 | 94.05 | 42.06 | -1.47 | 0.216 |
| Nitrate content in mg/kg in autumn | 5 | 1657.20 | 597.61 | 267.26 | |||
| Kale | Nitrate content in mg/kg in spring | 5 | 353.92 | 301.52 | 134.84 | -1.37 | 0.242 |
| Nitrate content in mg/kg in autumn | 5 | 639.80 | 323.63 | 144.73 | |||
| Chard | Nitrate content in mg/kg in spring | 5 | 1572.00 | 874.06 | 390.89 | 2.019 | 0.114 |
| Nitrate content in mg/kg in autumn | 5 | 876.40 | 257.16 | 115.01 | |||