Table 6.
Seasonal differences in nitrate levels regarding vegetable type in osijek
| Sample type: OSIJEK | N | Arithmetic mean | SD | Standard error | t | P | |
|---|---|---|---|---|---|---|---|
| Lettuce | Nitrate content in mg/kg in spring | 5 | 481.40 | 381.66 | 170.68 | -0.92 | 0.410 |
| Nitrate content in mg/kg in autumn | 5 | 729.20 | 305.36 | 136.56 | |||
| Spinach | Nitrate content in mg/kg in spring | 5 | 672.92 | 562.91 | 251.74 | -5.88 | 0.004 |
| Nitrate content in mg/kg in autumn | 5 | 2866.40 | 556.75 | 248.98 | |||
| Kale | Nitrate content in mg/kg in spring | 5 | 326.40 | 202.64 | 90.62 | -4.45 | 0.011 |
| Nitrate content in mg/kg in autumn | 5 | 1536.60 | 489.16 | 218.76 | |||
| Chard | Nitrate content in mg/kg in spring | 5 | 830.80 | 564.63 | 252.51 | -0.3 | 0.779 |
| Nitrate content in mg/kg in autumn | 5 | 714.00 | 627.26 | 280.52 | |||