Table 4. Effect of fertilization pattern on rice agronomic characteristics, dry weight, N content and N accumulation at the two sites.
| Year | Site | Treatment | Agronomic characters | Dry weight (t ha–1) | N content (g kg–1) | N accumulation (kg ha–1) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Productive tillers per hill | Spikelets per panicle | Filled spikelets per panicle | 1000 grain weight (g) | Grain | Straw | Root | Grain | Straw | Root | Grain | Straw | Root | Total | |||
| 2014 | Jiangyan | CK | 6.9c | 148b | 147a | 28.2a | 6.0b (49.6) | 4.6a (38.0) | 1.5b (12.4) | 8.3c | 4.3b | 7.1c | 49.5c (61.7) | 19.9b (24.9) | 10.7b (13.4) | 80.1c |
| FFP | 12.9b | 193a | 151ab | 25.5b | 11.6a (48.9) | 10.2a (43.0) | 1.9a (8.0) | 10.1b | 6.9a | 8.3b | 117.1b (57.6) | 70.4a (34.7) | 15.6a (7.7) | 203.2b | ||
| RZF | 14.9a | 176ab | 138b | 28.6a | 12.6a (51.0) | 10.3a (41.7) | 1.8a (7.3) | 10.9a | 7.3a | 9.1a | 137.0a (59.8) | 75.6a (33.0) | 16.5a (7.2) | 229.1a | ||
| Guangde | CK | 7.4c | 106c | 104b | 28.5a | 5.6b (53.3) | 3.7b (35.2) | 1.2b (11.4) | 8.4c | 4.9c | 6.4c | 47.1c (64.7) | 18.0c (24.8) | 7.7c (10.5) | 72.8c | |
| FFP | 13.6b | 172b | 132a | 27.5b | 9.8a (51.9) | 7.3a (38.6) | 1.8a (9.5) | 10.3b | 6.6b | 9.1b | 101.7b (61.4) | 47.9b (29.0) | 15.9b (9.6) | 165.6b | ||
| RZF | 17.8a | 188a | 135a | 24.5c | 10.3a (52.8) | 7.3a (37.4) | 1.9a (9.7) | 12.2a | 9.1a | 14.1a | 125.1a (57.4) | 66.3a (30.2) | 27.1a (12.4) | 218.5a | ||
| 2015 | Jiangyan | CK | 5.5c | 102c | 100c | 28.0a | 6.0c (43.5) | 6.1c (44.2) | 1.7c (12.3) | 7.9b | 3.2c | 6.7c | 46.5c (60.0) | 19.2c (24.9) | 11.7c (15.1) | 77.4c |
| FFP | 10.3b | 154b | 147a | 26.3b | 8.5b (44.0) | 8.5b (44.0) | 2.3b (11.9) | 7.3c | 3.5b | 8.7b | 61.8b (55.4) | 29.7b (26.7) | 19.9b (17.9) | 111.5b | ||
| RZF | 16.5a | 121a | 111b | 25.7c | 12.2a (44.5) | 12.4a (45.3) | 2.8a (10.2) | 9.3a | 7.2a | 11.6a | 113.8a (48.3) | 89.4a (38.0) | 32.3a (13.8) | 235.6a | ||
| Guangde | CK | 8.5c | 135b | 127b | 21.9b | 5.1c (44.3) | 4.9c (42.6) | 1.5b (13.0) | 7.7c | 4.5c | 7.1c | 39.0c (54.8) | 21.9c (30.8) | 10.3c (14.4) | 71.2c | |
| FFP | 11.4b | 150b | 125b | 24.5a | 7.9b (43.4) | 8.1b (44.5) | 2.2a (12.1) | 9.6b | 5.6b | 9.4b | 75.7b (53.0) | 45.8b (32.1) | 21.2b (14.9) | 142.7b | ||
| RZF | 14.8a | 182a | 153a | 16.0c | 8.6a (43.7) | 9.0a (45.7) | 2.1a (10.7) | 11.4a | 9.5a | 12.6a | 98.4a (46.7) | 85.8a (40.7) | 26.6a (12.6) | 210.7a | ||
CK, no N fertilizer. FFP, farmer fertilization practice. RZF, one—time root—zone fertilization. Values are the mean of four replicates. Different lowercase letters indicate significant differences (P < 0.05) between treatments within the same experimental site, according to the LSD tests. Values in parentheses indicate the percentage accounted for by total dry weight accumulation and N accumulation.