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| DOI：10.13522/j.cnki.ggps.20170004 |
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| The Interactive Impact of Water and Nitrogen on Greenhouse Green Pepper Under Film-mulched Drip Irrigation |
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CHENG Minghan, HAO Zhongyong, YANG Shengli, JIAO Xiyun, FAN Haiyan
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1. Beijing Water Science and Technology Research Institute, Beijing 100048, China; 2. Hohai University Water Conservancy and Hydropower College, Nanjing 210098, China; 3. Beijing Non-conventional Water Resources Development and Utilization and Water Saving Engineering Technology Research Center, Beijing 100048, China
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| Abstract: |
| 【Objective】 Nitrogen fertilizer is one of important fertilizers for crop growth, and the purpose of this paper is to experimentally explore the interactive effects of water and nitrogen fertilizer on greenhouse pepper under different combined ratios of irrigation and nitrogen fertigation. 【Method】 We examined two irrigation rates: one at 70% of the field capacity (W1) and the other one at 80% of the field capacity (W2), and three nitrogen applications: 50 kg/hm2 (F1), 85 kg/hm2 (F2) and 120 kg/hm2 (F3), with the combination of conventional irrigation and fertilization as control. Overall, there were seven treatments. In each treatment, we measured the plant height, stem diameter, leaf area index, net photosynthetic rate, transpiration rate, total yield, water use efficiency, and partial productivity of nitrogen fertilizer.【Result】 The yield in nitrogen application of 120 kg/hm2 was significantly higher than that in other treatments. The principal component analysis showed that the yield of pepper under the seven treatments was ranked in W1F3>W2F3>CK>W2F2>W1F1>W1F2>W2F1.【Conclusion】 The combination of irrigation by keeping soil moisture at 70% of the field capacity and 120 kg/hm2 of nitrogen application is the optimal irrigation and nitrogen fertilization for the greenhouse green peppers studied in this paper. |
| Key words: water-nitrogen coupling; total yield; water production efficiency; principal component analysis |
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