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| DOI：10.13522/j.cnki.ggps.20180183 |
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| Growth and Water-nitrogen Use Efficiency of Sunflower under Mulched Drip Fertigation with Different Water-nitrogen Ratios |
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YANG Li, WEI Zhanmin*, XU Dawei, SU Tingting, ZHANG Jinding
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Water Conservancy and Civil Engineering College, Agricultural University of the Inner Mongolia, Hohehot 010018, China
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| Abstract: |
| 【Objective】The overarching objective of this paper is to present the results of an experimental study on the combined effect of water and nitrogen on development of sunflower and its water and nitrogen use efficiency under drip fertigation.【Method】The experiment was conducted in Hetao Irrigation District. We studied three irrigation levels: 135 mm (W1), 180 mm (W2) and 225 mm (W3), and three nitrogen levels: 120 kg/hm2 (N1), 160 kg/hm2 (N2) and 200 kg/hm2 (N3). In each treatment, we used tension meter to determine the timing and the amount of irrigation. 【Result】Nitrogen application had a significant impact on plant height and leaf area index (LAI) at both grain filling stage and maturity stage (P<0.01), and water and nitrogen application combined to significantly affect the dry matter accumulation (P<0.01). Under W2 and W3, the grain yield increased first followed by decline with the increase in nitrogen application, while under W1, grain yield monotonically increased with nitrogen application. The harvest index in all treatments varied from 0.476 to 0.603, and water use efficiency was between 1.49 and 2.61 kg/m3. With the increase in nitrogen application, the nitrogen taken up by plant increased first followed by a decline after reaching a peak. 【Conclusion】The results showed that the combination of W2+N2 was the best fertigation for sunflower in the studied region. |
| Key words: mulched drip irrigation; water-nitrogen ratio; water and nitrogen utilization efficiency; sunflower |
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