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| DOI： |
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| Effects of Water and Nitrogen Supply on Nitrogen Uptake of Greenhouse Cucumber and Nitrate Nitrogen Distribution in Soil |
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LI Jing, ZHANG Fucang, JIANG Mingjie, FANG Dongping, WANG Haidong
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Shaanxi Land Construction Group, Xi ’an 710075, China; Northwest A&F University, Yangling 712100, China; Shaanxi Dong Jia M&E Installation Co., LTD, Xi ’an 710075, China; Zhejiang Design Institute of Water Conservancy and Hydroelectric Power , Hangzhou 310002, China
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| Abstract: |
| The greenhouse experiment was conducted to study the effects of different water and nitrogen supply on nitrogen uptake of greenhouse cucumber and nitrate nitrogen distribution in soil. The results showed that nitrogen accumulation in various organs of cucumber increased with the growth stage advancing, and gained the maximum amount of accumulation in full fruit period. In addition, the overall growth trend presented "S" type; In different growth periods, nitrogen accumulation in various organs of cucumber showed that: leaf> stem> root, while nitrogen accumulation in fruit reached the max value during the fruiting period, and increased with the increase of the irrigation and fertilizer amount; Irrigation, nitrogen rate and water and nitrogen interaction had significant influence on nitrogen accumulation, UPE and PFP of cucumber. Under the same irrigation conditions, NUE, UPE and PFP presented a decreasing trend with the increasing amount of nitrogen. For the same nitrogen levels, UPE and PFP significantly increased with the increase of irrigation, but the trend of NUE varies under the different irrigation conditions. Irrigation and nitrogen rate had a major impact on soil nitrate distribution, and nitrogen rate was the key factor of affecting soil nitrate accumulation. With the increase of irrigation amount, nitrate content in surface soil was gradually decreased, while increased with the increase of nitrogen rate, and the higher nitrogen amount caused the leaching phenomenon more evidently. |
| Key words: greenhouse cucumber; water and nitrogen supply; fertigation; nitrogen uptake; nitrate nitrogen. |
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