| Study on effect of double-cropping system on moisture of dry farmland in the southeast Loess Plateau — A case study of Yangling |
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| DOI：10.7606/j.issn.1000-7601.2008.03.08 |
| Key Words: the southeast Loess Plateau dry farmland double-cropping system daily water consumption water use efficiency |
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| Abstract: |
| In order to observe soil water dynamics and water consumption in different multiple cropping systems by regarding it as a whole analysis was made of soil water dynamics water satisfied rate daily water consumption and yield of different treatments．The results showed that：planting two crops in a year under the condition of640mm annual mean rainfall in the Loess Plateau conduced to the substantial use of solar and water resources in summer fallow the biomass yield economical yield and water use efficiency was improved in different degrees and the material cycle was enhanced．The daily water consumption of treatment Ⅲ and treatment Ⅳ were only higher by0．07 mm／d and 0．1 mm／d compared with the contrast treatment Ⅱ was equal to the contrast. The best economic returns of multiple cropping systems were “wheat—maize”．The best sustainability of soil water is “wheat—foxtail millet”. In the premise of significant economic benefits multiple cropping systems can be sustainablly developed．The optimum multiple-cropping systems with efficient resources utilization and high economic benefits are “wheat—maize” and “wheat—soybean”． |