Modeling the Impact of “Double-Delay” Technology on Yield of Wheat-Maize Cropping System in the North China Plain

doi:10.3969/j.issn.1000-6362. 2015.05.011

Abstract

Abstract: “Double-Delay” technology, i.e., delaying both the sowing time of wheat and the harvesting time of maize, is an effective option for wheat and maize cropping system adapting to climate change in the North China Plain (NCP). To study the impact of “Double-Delay” technology on the yield of wheat-maize cropping system as well as the spatial variability of yield changes, APSIM model was used to simulate the impact of “Double-Delay” technology on wheat and maize yield under rain-fed and sufficient irrigation conditions in the NCP. The simulated results averaged from 2000 to 2009 showed that “Double-Delay” technology could lead to the reduction in wheat yield, but increase substantially maize yield and total yields of wheat-maize cropping system under rain-fed and sufficient irrigation conditions compared with the traditional planting pattern. Under rain-fed condition, the averaged increase rates of maize yield were 19.8%, 14.5% and 13.4%, respectively in Hebei, Shandong, and Henan provinceswith the total increase rates of wheat-maize cropping system by 10.7%, 3.2% and 4.8%, respectively. Under sufficient irrigation condition, the averaged increase rates of maize were 14.2%, 8.0% and 8.5% in Hebei, Shandong, and Henan provinces, respectively with the total increase rates of wheat-maize cropping system were 4.5%, 3.4% and 2.8%, respectively. The increase in maize yield was attributed to the lengthened growth period of maize resulting from the delayed harvested time and the reduced field preparation time. The study results showed that “Double-Delay” technology increased the yield of wheat-maize system by adapting to climate change with higher increase rate in northern regions than in southern regions of NCP, especially in the Northern part of Hebei province. In general, “Double-Delay” technology is most suitable to apply in Hebei province. The study implied that adaptation options of agriculture to climate change should varied geographically.

Key words: Climate warming, Pre-winter positive accumulated temperature, Adaptation, Optimum sowing date, APSIM model

WANG Na, WANG Jing, FENG Li-ping, PAN Xue-biao, YU Wei-dong. Modeling the Impact of “Double-Delay” Technology on Yield of Wheat-Maize Cropping System in the North China Plain[J]. Chinese Journal of Agrometeorology, 2015, 36(05): 611-618.

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