| Validation of the effect of DSSAT model on winter wheat under conservation tillage treatments in west Henan |
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| DOI：10.7606/j.issn.1000-7601.2010.03.12 |
| Key Words: conservation tillage winter wheat crop growth yield soil water DSSAT model |
| Author Name | Affiliation | | LU Xianghui | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | MU Xingmin | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Instiule of Soil and Water Conservation, Chinese Academy of Sciences, Yangling，Shaanxi 712100, China | | Vinay Nangia | International Water Management Institute , Colombo 2075, Sri Lanka | | SUI Yanyan | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | YAO Yuqing | Luoyang Institute of Agricultural Sciences, Luoyang, Henan 471022, China | | WANG Fei | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Instiule of Soil and Water Conservation, Chinese Academy of Sciences, Yangling，Shaanxi 712100, China | | CAO Peng | Instiule of Soil and Water Conservation, Chinese Academy of Sciences, Yangling，Shaanxi 712100, China |
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| Abstract: |
| Agricultural system models are tools to represent and understand major processes and their interactions in
agricultural system. We used the Decision Support System for Agrotechnology Transfer (DSSAT) with four diferent tillage treatments data from a study in west Henan of China to evaluate winter wheat yield, leaf area index and water balance. The model was calibrated using the data of field experiment. The site had a winter wheat-fallow-winter wheat rotation. The treatments were:(1) decrease tllage (DT), 10~15 cm height straw mulching and once plough 25 cm on 1st July; (2) zero tillage (ZT), zero tillage with 35~40 cm height straw mulching; (3) subsoiling (SS), 35~40 cm height straw mulching and suboiling 40 cm depth on 1st July; (4) conventional tillage (CT), 10~15 cm height straw mulching and twice plough 20 cm on 1st July and 1st October. DSSAT correctly simulated four tillage treatments variations in winter yield, leaf area index and soil water balance. Winter wheat yield variation was simulated with better satisfaction (the error absolute values was less than 3.95% and the error mean absolute value was 2. 78%). Mean value of root mean
square erors (RMSE) for simulated leaf area index (LAI) and soil water storage were 0.41 and 0.084, respectively.
The predicted water use efficiency for the four tillage treatments were 15.85, 15.40, 16.58 and 15.81 kg/(mm·hm2), respectively, and these values were close to the measured data (16.82, 14.44, 16.86 and 15 .66 kg/(mm·hm2), respectively). Although the analysis results showed us the DSSAT V4.5 was very well agreement for simulated winter wheat grown in west Henan, however, these preliminary results are based on one year and four tillage treatments dataset and further long term analysis need to be carried out for improving the understanding of the conservation agriculture cropping systems in west Henan, China. |
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