Research Article
Effect of Irrigation and Preplant Nitrogen Fertilizer Source on Maize in the Southern Great Plains
Table 3
Field activities for the four site-years utilized in this study.
| | Field activity | 2012 | 2013 | | STWa | LCBa | STW | LCB |
| | Preplant N fertilization date | April 2 | April 5 | March 18 | March 18 | | Planting date | April 9 | April 10 | March 20 | March 20 | | Maize hybrid | Pioneer P1498HR | Pioneer P0876HR | Pioneer P1498HR | Dekalb 63–55 | | Seeding rate (seeds ha−1) | 49,000 | 49,000 | 54,000 | 54,000 | | Start irrigation | May 16 | May 17 | June 13 | June 14 | | Cease irrigation | July 11 | July 9 | July 9 | July 9 | | Irrigation percent of PETb | 38 | 21 | 28 | 13 | | Number of irrigations | 22 | 14 | 9 | 5 | | Amount of irrigation (mm) | 173 | 89 | 55 | 27 | | Amount of rainfall (mm) | 233 | 201 | 621 | 834 | | Harvest date | August 6 | July 26 | September 9 | September 4 |
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STW: Stillwater, OK; LCB: Lake Carl Blackwell, OK.
bPET: potential evapotranspiration.
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