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Table 8.
N – use efficiency (%) by sugar beet, sunflower and winter barley grown in crop rotation and in continuous monocropping, average for 1994–2018, Selectia RIFC
| Crop rotation, continuous monocrops | Predecessors | Fertilization | Extra yields from fertilizer t/ha | N taken up by extra yield, kg/ha | N applied with mineral ferilizers, kg/ha a.i./ha | N – use efficiency, % | Total N uptake on fertilized plots, kg/ha | Share of soil fertility in yield formation, % | |
|---|---|---|---|---|---|---|---|---|---|
| Unfertilized | Fertilized | ||||||||
| Sugar beet | |||||||||
| Crop rotations | Winter wheat | 28.90 | 38.12 | +9.22 | 36.9 | 60 | 61.5 | 152.5 | 75.8 |
| Continuous monocrops | Sugar beet | 7.81 | 14.92 | +7.11 | 16.4 | 60 | 27.3 | 59.7 | 72.5 |
| Sunflower | |||||||||
| Crop rotations | Winter wheat | 1.97 | 2.16 | +0.19 | 7.6 | 30 | 25.3 | 86.4 | 91.2 |
| Continuous monocrops | Sun flower | 1.40 | 1.61 | +0.21 | 8.4 | 30 | 28.0 | 64.4 | 87.0 |
| Crop rotations | |||||||||
| Crop rotations | Corn for grain | 2.94 | 4.22 | +1.28 | 34.6 | 60 | 57.7 | 113.9 | 59.6 |
| Continuous monocrops | Winter barley | 1.73 | 3.55 | +1.82 | 49.1 | 60 | 81.8 | 95.9 | 48.8 |
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