Table 4.
Comparison of root mean square error (RMSE) and p according to two-sample t-tests between simulated (S) and measured (M) yields of Chokyung wheat seeded in the fall of 2018 at Chonnam National University (CNU), Gwangju, and seeded in the spring and fall seasons of 2019 at Gyeongsang National University (GNU), Jinju, south Gyeongsang province, South Korea, with different amounts of nitrogen (N) applications of 40 kg ha−1 at planting, 30 kg ha−1 at rejuvenation, and 0 kg ha−1 at initial reproduction (N40-30-0), N40-30-30, and N40-30-60 for model validation.
| Season and site | N treatment | Simulated | Measured | RMSE | p (α = 0.05) |
|---|---|---|---|---|---|
| —————- ton ha−1 —————- | Unitless | ||||
| Fall, CNU | 40-30-30 | 3.991 | 3.843 | 1.512 | 0.858 |
| Spring, GNU | 40-30-30 | 6.445 | 6.513 | 0.438 | 0.276 |
| Fall, GNU | 40-30-0 | 3.050 | 3.317 | 1.175 | 0.717 |
| 40-30-30 | 4.561 | 4.842 | 0.728 | 0.389 | |
| 40-30-60 | 4.067 | 5.066 | 1.456 | 0.859 | |