Research Article
Evaluation of In-Season Nitrogen Management for Summer Maize in North Central China
Table 2
Experimental design for N treatments at field sites for summer maize in 2009.
| | Treatments | Total N rate (kg ha−1) | Basal N rate before planting (June 12) (kg ha−1) | Topdressing N rate (kg ha−1) | Date of N topdressing |
| | N0 | 0 | 0 | 0 | June 25 | | N120 (0/120) | 120 | 0 | 120 | June 25 | | N120 (30/90) | 120 | 30 | 90 | June 25 | | N120 (60/60) | 120 | 60 | 60 | June 25 | | N180 (0/180) | 180 | 0 | 180 | June 25 | | N180 (45/135) | 180 | 45 | 135 | June 25 | | N180 (90/90) | 180 | 90 | 90 | June 25 | | N240 (0/240) | 240 | 0 | 240 | July 17 |
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