| Much Improved Irrigation Use Efficiency in an Intensive Wheat-Maize Double Cropping System in the North China Plain |
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| 作者姓名： | Quanxiao Fang Yuhai Chen Qiang Yu Zhu Ouyang Quanqi Li Shunzhang Yu |
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| 作者单位： | [1]Agronomy College Qingdao Agricultural University, Qingdao China266109 [2]Institute of Geographical Sciences and Natural Resources Research The Chinese Academy of Sciences, Beijing China100101 [3]Agronomy College Shandong Agricultural University, Taian China271018 |
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| 摘 要： | Crop yield and water use efficiency （WUE） in a wheat-maize double cropping system are influenced by short and uneven rainfalls in the North China Plain （NCP）, A 2-year experiment was conducted to investigate the effects of irrigation on soil water balance, crop yield and WUE to improve irrigation use efficiency in the cropping system, Soil water depletion （~SWS） by crop generally decreased with the increase of irrigation and rainfall, while ASWS for the whole rotation was relatively stable among these irrigation treatments, High irrigations in wheat season increased initial soil moisture and ASWS for subsequent maize especially in the drought season, Initial soil water influenced mainly by the irrigation and rainfall in the previous crop season, is essential to high yield in such cropping systems, Grain yield decreased prior to evapotranspiraUon （ET） when ET reached about 300mm for wheat, while maize showed various WUEs with similar seasonal ET, For whole rotation, WUE declined when ET exceeded about 650 mm, These results indicate great potential for improving irrigation use efficiency in such wheat-maize cropping system in the NCP, Based on the present results, reasonable irrigation schedules according to different annual rainfall conditions are presented for such a cropping system.
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| 关 键 词： | 耕作系统 修剪方法 水分 中国 农作物 |
| 修稿时间： | 2007-04-26 |
Much Improved Irrigation Use Efficiency in an Intensive Wheat-Maize Double Cropping System in the North China Plain |
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| Authors: | Quanxiao Fang Yuhai Chen Qiang Yu Zhu Ouyang Quanqi Li Shunzhang Yu |
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| Institution: | 1.Agronomy College, Qingdao Agricultural University, Qingdao 266109, China; 2.Institute of Geographical Sciences and Natural Resources Research, The Chinese Academy of Sciences, Beijing 100101, China;3.Agronomy College, Shandong Agricultural University, Taian 271018, China |
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| Abstract: | Crop yield and water use efficiency (WUE) in a wheat‐maize double cropping system are influenced by short and uneven rainfalls in the North China Plain (NCP). A 2‐year experiment was conducted to investigate the effects of irrigation on soil water balance, crop yield and WUE to improve irrigation use efficiency in the cropping system. Soil water depletion (ΔSWS) by crop generally decreased with the increase of irrigation and rainfall, while ΔSWS for the whole rotation was relatively stable among these irrigation treatments. High irrigations in wheat season increased initial soil moisture and ΔSWS for subsequent maize especially in the drought season. Initial soil water influenced mainly by the irrigation and rainfall in the previous crop season, is essential to high yield in such cropping systems. Grain yield decreased prior to evapotranspiration (ET) when ET reached about 300 mm for wheat, while maize showed various WUEs with similar seasonal ET. For whole rotation, WUE declined when ET exceeded about 650 mm. These results indicate great potential for improving irrigation use efficiency in such wheat ‐ maize cropping system in the NCP. Based on the present results, reasonable irrigation schedules according to different annual rainfall conditions are presented for such a cropping system. |
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| Keywords: | cropping system crop yield irrigation schedule North China Plain soil water balance water use efficiency |
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