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| Ridge-furrow rainwater harvesting with supplemental irrigation to improve seed yield and water use efficiency of winter oilseed rape (Brassica napus L.) |
| GU Xiao-bo, LI Yuan-nong, DU Ya-dan, YIN Min-hua |
College of Water Resources and Architectural Engineering, Northwest A&F University/Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Area, Ministry of Education, Yangling 712100, P.R.China |
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Abstract Ridge-furrow rainwater harvesting (RFRH) planting pattern can lessen the effect of water deficits throughout all crop growth stages, but water shortage would remain unavoidable during some stages of crop growth in arid and semiarid areas. Supplemental irrigation would still be needed to achieve a higher production. Field experiments were conducted for two growing seasons (2012–2013 and 2013–2014) to determine an appropriate amount of supplemental irrigation to be applied to winter oilseed rape at the stem-elongation stage with RFRH planting pattern. Four treatments, including supplemental irrigation amount of 0 (I1), 60 mm (I2) and 120 mm (I3) with RFRH planting pattern and a control (CK) irrigated with 120 mm with flat planting pattern, were set up to evaluate the effects of supplemental irrigation on aboveground dry matter (ADM), nitrogen nutrition index (NNI), radiation use efficiency (RUE), water use efficiency (WUE), and seed yield and oil content of the oilseed rape. Results showed that supplemental irrigation improved NNI, RUE, seed yield and oil content, and WUE. However, the NNI, RUE, seed yield and oil content, and WUE did not increase significantly or even showed a downward trend with excessive irrigation. Seed yield was the highest in I3 for both growing seasons. Seed yield and WUE in I3 averaged 3 235 kg ha–1 and 8.85 kg ha–1 mm–1, respectively. The highest WUE was occurred in I2 for both growing seasons. Seed yield and WUE in I2 averaged 3 089 kg ha–1 and 9.63 kg ha–1 mm–1, respectively. Compared to I3, I2 used 60 mm less irrigation amount, had an 8.9% higher WUE, but only 4.5 and 0.4% lower seed yield and oil content, respectively. I2 saved water without substantially sacrificing yield or oil content, so it is recommended as an appropriate cultivation and irrigation schedule for winter oilseed rape at the stem-elongation stage.
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Received: 29 March 2016
Accepted:
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| Fund: This research was supported by the Special Fund for Agro-scientific Research in the Public Interest, China (201503105 and 201503125) and the National High-Tech R&D Program of China (863 Program, 2011AA100504). |
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Corresponding Authors:
LI Yuan-nong, E-mail: liyuannong@163.com
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| About author: GU Xiao-bo, E-mail: gxb123027@163.com |
Cite this article:
GU Xiao-bo, LI Yuan-nong, DU Ya-dan, YIN Min-hua.
2017.
Ridge-furrow rainwater harvesting with supplemental irrigation to improve seed yield and water use efficiency of winter oilseed rape (Brassica napus L.). Journal of Integrative Agriculture, 16(05): 1162-1172.
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