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| Effects of Different Control Measures on Cucumber Bleeding Sap and Its Nutrient Contents in Greenhouse |
| XU Yu，JIANG Li-hua，ZHENG Fu-li，LIN Hai-tao，SONG Xiao-zong，TAN De-shui，GAO Xin-hao，LIU Zhao-hui* |
| Institute of Resources and Environment，Shandong Academy of Agricultural Sciences，Jinan 250100，Shandong，China |
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Abstract A field experiment was conducted to study the effects of different control measures on cucumber（Cucumis sativus L.）yield，bleeding sap and its nutrient content in greenhouse．The results showed that the root bleeding intensity on day was higher than that in night．And with the prolongation of growing period，the bleeding intensity and amount showed a increasing trend．But under the influence of root growth and external environment，the increased degree became smaller at the later stage．There was many free amino acid in bleeding sap，but the main nitrogen form was nitrate N．Compared with the fertilization model used by peasant，the bleeding amount and the contents of nitrate N，ammonium N，free amino acid and K in the bleeding sap could increase significantly through straw returning．This measure could also increase the root activity and plant absorption of N and K．The yield slightly increased about 1%．For the influence of irrigation frequency，the above indicators of bleeding sap under drip irrigation measure were all decreased significant and the yield decreased 13.1% with significant differences．
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Received: 22 February 2012
Published: 05 April 2012
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