| College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China; Institute of Soil and Water Conservation, CAS & MWR, Yangling , Shaanxi 712100, China |
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| DOI：10.7606/j.issn.1000-7601.2010.03.13 |
| Key Words: rotation system EPIC model crop yield Changwu arid-plateau |
| Author Name | Affiliation | | WANG Xuechun | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Jun | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, CAS & MWR, Yangling , Shaanxi 712100, China | | REN Jingjing | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Simulation results of EPIC model were analysed after the simulation of different rotation sequences. Con-
sidering grain yield, economic benefit, water stress days and productivity rate of N fertilizer generally, different rotation
sequences were assessed, then the advantage and disadvantage were compared. The results showed that:(1) The average grain yield of 8 rotation sequences was 4.61, 4. 40, 4.16, 4.48, 4.28, 4.29, 4.71 and 4.55 t/hm2 respectively and a downward trend appeared during the simulation period. Considering economic benefit, spring maize-winter wheat was the best rotation sequence. (2) Water stress days, suffered by spring maize and winter wheat, of R2 (spring maize-win-ter wheat-winter wheat) was the least (29.51 days average) among 8 rotation sequences. Winter wheat was more suscep-tible to water stress than spring maize in the rotation system. The value of productivity efficiency of N fertilizer in R1(spring maize-winter wheat) was the greatest among all rotation sequences. Taking grain yield, economic benefit, water stress days and productivity rate of N fertilizer into account , the appropriate rotation sequence was R1 ( spring maize-win-ter wheat) on Changwu arid-plateau. |
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