Table 2.
Effects of overall sidedress N rate (0 and 112 kg N ha−1) on 15N fertilizer recovery (15Nrec, kg kg−115N applied) and proportional allocation of 15N uptake (15Np, %) in plant components at multiple development stages in 2013.
| GS | N rate (kg ha−1) | 15Nrec (kg kg−1) | LVS 15Np (%) | STM 15Np (%) | HSK 15Np (%) | EAR 15Np (%) | COB 15Np (%) | KRN 5Np (%) |
|---|---|---|---|---|---|---|---|---|
| V14 | 0 | 0.25 b | 56 | 44 | ---- | ---- | ---- | ---- |
| 112 | 0.30 a | 51 | 49 | ---- | ---- | ---- | ---- | |
| V16 | 0 | 0.41 | 50 | 32 b | 15 a | ---- | ---- | ---- |
| 112 | 0.46 | 48 | 37 a | 14 b | ---- | ---- | ---- | |
| ER1 | 0 | 0.37 | 47 a | 32 b | 16 a | ---- | ---- | ---- |
| 112 | 0.42 | 46 b | 40 a | 13 b | ---- | ---- | ---- | |
| R1 | 0 | 0.32 b | 39 b | 22 b | 11 | 28 a | ---- | ---- |
| 112 | 0.34 a | 42 a | 26 a | 10 | 22 b | ---- | ---- | |
| R2 | 0 | 0.27 b | 35 b | 19 b | 11 a | 35 a | ---- | ---- |
| 112 | 0.34 a | 40 a | 25 a | 9 b | 27 b | ---- | ---- | |
| R4 | 0 | 0.25 b | 26 b | 13 | 3 | 58 a | ---- | ---- |
| 112 | 0.33 a | 33 a | 13 | 3 | 51 b | ---- | ---- | |
| R5 | 0 | 0.18 b | 17 | 11 | 2 | 70 b | 4 a | 66 b |
| 112 | 0.28 a | 16 | 10 | 2 | 72 a | 3 b | 69 a |
GS, Growth stage; LVS, Leaf; STM, Stem; HSK, Husk; STV, Stover (leaf + stem + husk + cob); Ear = cob + kernel (KRN).
Within a growth stage, means without letters are not significant different from each other (p > 0.05), and means with different letters are significantly different at p ≤ 0.05 level T-test (LSD).