Temperature, especially accumulated temperature, is an important environmental factor that plays a fundamental role in agricultural productivity. To examine temporal and spatial variation in accumulated temperature requirements of maize as indicated by ≥10. °C accumulated temperature and growing degree days (GDD), we conducted experiments during 2007-2012 at 35 locations in seven provinces in the north spring maize region between 35°11'. N and 48°08'. N and 6 locations in four provinces in the Huanghuaihai maize region between 32°52'. N and 41°05'. N in China. The most widely cultivated maize hybrids of ZD958 and XY335 were used in this study. We found that the coefficients of variation for ≥10. °C accumulated temperature and GDD requirements were different during different growth periods, with a descending rank order of sowing to emergence > silking to maturity > emergence to silking > sowing to maturity and greater in the north spring maize region than in the Huanghuaihai maize region. The coefficients of variation were lower for ≥10. °C accumulated temperature than GDD requirements for both cultivars in both planting regions. Significant differences existed between locations and years for the ≥10. °C accumulated temperature and GDD requirements. These have implications for appropriate maize cultivars recommendation, and high and stable yield achieving by reasonably using accumulated temperature across different regions of China. © 2014 Elsevier B.V.
Hou, P., Liu, Y., Xie, R., Ming, B., Ma, D., Li, S., & Mei, X. (2014). Temporal and spatial variation in accumulated temperature requirements of maize. Field Crops Research, 158, 55–64. https://doi.org/10.1016/j.fcr.2013.12.021