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| DOI：10.13522/j.cnki.ggps.2016.0162 |
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| Fertigation of Autumn-winter Greenhouse Cucumber in East Liaoning Province |
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DOU Chaoyin,MENG Weizhong,CHEN Wei,YAN Weichen
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1. School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China;2. Water Conservancy and Hydropower Science Research Institute of Liaoning, Shenyang 110003, China
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| Abstract: |
| 【Objective】 Drip fertigation has been increasingly used in producing vegetables from greenhouses and this paper analyzes its efficacy in east Liaoning Province. 【Method】 The experiment considered three levels of irrigation by keeping soil moisture at 65%, 75% and 85% of the field capacity (referred to as W1, W2 and W3 respectively), three nitrogen applications at 70%, 100% and 130% of the potential nitrogen requirement by the plant (referred to as N1, N2 and N3 respectively), and three potassium applications at 70%, 100% and 130% of the potential requirement by the plant (referred to as K1, K2 and K3 respectively). The model plant was cucumber. 【Result】 Compared with conventional furrow irrigation, there was no noticeable difference in height and diameter of the cucumber under different treatments, but plant phenotypes were more uniform. Fertigation improved the yield compared to conventional furrow irrigation. The irrigation levels and the amounts of applied nitrogen and potassium did not have an significant effect on yield. When the difference between the potential nutrients requirements and the amounts of applied nutrients did not exceed 30%, different combinations of water, N and K did not have a noticeable impact on the yield. Variance analysis indicated that the yield was most sensitive to water, followed by nitrogen and potassium. The yield maximized at W2N2K2. 【Conclusion】 In drip fertigation of autumn-winter vegetables grown in greenhouse, keeping soil moisture at 75% of the field capacity, along with moderate application of nitrogen and potassium (compared with their potential requirements by the plant), gives the best yield. |
| Key words: drip irrigation; fertigation; cucumber; yield; plant growth |
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