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Much Improved Irrigation Use Efficiency in an Intensive Wheat-Maize Double Cropping System in the North China Plain 被引量:11
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作者 quanxiao fang Yuhai Chen +3 位作者 Qiang Yu Zhu Ouyang Quanqi Li Shunzhang Yu 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2007年第10期1517-1526,共10页
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 e... 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. 展开更多
关键词 cropping system crop yield irrigation schedule North China Plain soil water balance water use efficiency.
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Long-term simulation of growth stage-based irrigation scheduling in maize under various water constraints in Colorado, USA
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作者 quanxiao fang Liwang MA +5 位作者 Lajpat Rai AHUJA Thomas James TROUT Robert Wayne MALONE Huihui ZHANG Dongwei GUI Qiang YU 《Frontiers of Agricultural Science and Engineering》 2017年第2期172-184,共13页
Due to varying crop responses to water stress at different growth stages, scheduling irrigation is a challenge for farmers, especially when water availability varies on a monthly, seasonal and yearly basis. The object... Due to varying crop responses to water stress at different growth stages, scheduling irrigation is a challenge for farmers, especially when water availability varies on a monthly, seasonal and yearly basis. The objective of this study was to optimize irrigation between the vegetative(V) and reproductive(R) phases of maize under different available water levels in Colorado. Longterm(1992–2013) scenarios simulated with the calibrated Root Zone Water Quality Model were designed to meet40%–100% of crop evapotranspiration(ET) requirements at V and R phases, subject to seasonal water availabilities(300, 400, 500 mm, and no water limit), with and without monthly limits(total of 112 scenarios). The most suitable irrigation between V and R phases of maize was identified as 60/100, 80/100, and 100/100 of crop ET requirement for the 300, 400, 500 mm water available, respectively, based on the simulations from 1992 to 2013. When a monthly water limit was imposed, the corresponding suitable irrigation targets between V and R stages were 60/100,100/100, and 100/100 of crop ET requirement for the above three seasonal water availabilities, respectively.Irrigation targets for producing higher crop yield with reduced risk of poor yield were discussed for projected five-year water availabilities. 展开更多
关键词 RZWQM ET-based irrigation schedule MAIZE water constrains
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