调控措施对日光温室黄瓜伤流液及其养分含量的影响

Effects of Different Control Measures on Cucumber Bleeding Sap and Its Nutrient Contents in Greenhouse

在日光温室栽培条件下,以农民习惯施肥模式为对照,研究了秸秆还田和滴灌两种水氮调控措施对黄瓜产量、伤流液及养分吸收的影响。结果表明:白天的根系伤流强度均明显高于夜间;且随生育期延长,伤流强度和伤流量呈升高趋势,但受根系生长和外界环境的影响,后期升幅较小。伤流液中的氮素形态以硝态氮为主,含有大量游离氨基酸。与当地习惯施肥模式相比,通过秸秆还田调节土壤C/N措施可以显著增加伤流量和伤流液中硝态氮、铵态氮、游离氨基酸和钾含量,增强了根系活力,也促进了作物对N、K养分的吸收,略增产1%,差异不显著;而受灌溉频率的影响,滴灌措施下植株伤流液的上述指标都显著降低,产量降低13.1%,差异显著。

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.