Table 2.
Nitrogen allocation (%) among leaf, stem, and pod fractions of pea at 15, 30, 45, 60, and 75 d after emergence as affected by cropping system and N fertilization treatment, averaged across 2012–2014.
| Cropping systema | N treatmentb | 15 | 30 | 45 | 60 | 75 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Leaf | Stem | Leaf | Stem | Leaf | Stem | Pod | Leaf | Stem | Pod | Leaf | Stem | Pod | |||
| Intercropped | N0 | 55.1 | 44.9 | 50.6 | 49.4 | 37.9 | 34.6 | 27.5 | 24.7 | 38.6 | 36.7 | 6.3 | 21.7 | 72.0 | |
| Pea | N45 | 55.4c | 44.6 | 49.1 | 50.9 | 35.7 | 46.5 | 17.8 | 25.0 | 51.6 | 23.4 | 5.0 | 23.1 | 71.8 | |
| N90 | 32.7 | 41.5 | 25.8 | 22.6 | 45.2 | 32.2 | 6.5 | 25.0 | 68.6 | ||||||
| N135 | 30.1 | 37.1 | 32.8 | 23.0 | 45.3 | 31.6 | 8.0 | 24.1 | 67.9 | ||||||
| Sole pea | N0 | 54.8 | 45.2 | 51.0 | 49.0 | 39.8 | 43.6 | 16.6 | 26.4 | 39.0 | 34.6 | 7.0 | 21.9 | 71.2 | |
| N45 | 55.1 | 44.9 | 48.6 | 51.4 | 36.5 | 49.8 | 13.7 | 28.5 | 51.3 | 20.2 | 5.1 | 22.9 | 71.9 | ||
| N90 | 35.5 | 43.8 | 20.7 | 27.0 | 45.4 | 27.6 | 7.7 | 25.1 | 67.2 | ||||||
| N135 | 33.0 | 47.2 | 19.7 | 26.7 | 47.4 | 25.8 | 8.6 | 26.2 | 65.3 | ||||||
| LSD (0.05)d | − | − | − | − | 2.4 | 2.3 | 2.0 | 0.2 | 4.0 | 0.9 | 0.5 | 0.5 | 1.3 | ||
| P > F | |||||||||||||||
| Cropping system (C) | NS | NS | NS | NS | 0.037 | 0.000 | 0.000 | 0.000 | 0.038 | 0.000 | 0.004 | 0.013 | 0.028 | ||
| N treatment (N) | NS | NS | NS | NS | 0.000 | 0.000 | 0.000 | 0.019 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | ||
a
Intercrop and sole crop means the intercropped pea and sole pea.
b
N0 is the non-N fertilized control. N45, N90, and N135 represent N fertilizer applied at 90 kg N ha−1 as base fertilizer at sowing plus 45, 90, and 135 kg N ha−1 top-dressed at flowering, respectively.
c
Data in bold font represent the averaged value for N1, N2, and N3, as N fertilization did not differ among these treatments at 15 and 30 d after emergence.
d
LSD was for the treatments in the same column.