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Chinese Journal of Applied Ecology ›› 2004, Vol. ›› Issue (4): 667-672.

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Interactive effect of N and Ca on N uptake by tomato

LOU Chunrong1, HAN Xiaori2, XIAO Qianming1, SUN Wentao1, QIU Weiwen1, FU Zhongxin 3   

  1. 1. Institute of Soil and Fertilizer, Liaoning Agricultural Academy of Sciences, Shenyang 110161, China;
    2. College of Land and Environment, Shenyang Agricultural University, Shenyang 110161, China;
    3. Institute of Plant Protection, Liaoning Agricultural Academ
  • Received:2002-03-12 Revised:2003-04-10 Online:2004-04-15

Abstract: To study the effect of fertilizer N and Ca on tomato plant,a pot experiment was conducted with meadow soil in Shenyang.The results showed that under the experimental condition,the N contents in stems,leaves and fruits decreased gradually along with the growth stages.For all treatments,the NO33--N content in fruits,which was within the raw eatable standard,had a positive correlation to N fertilization level.Adequate application of Ca was useful to control the NO33--N content.The response of N contents in stems,leaves and fruits to fertilizer N and Ca was in line with the law of diminishing marginal returns.From flowering stage to fruit expanding stage,the response of fertilizer N was most activated.The nitrate reductase activity in leaves might be greatly affected by fertilizer N,while adequate Ca fertilization could decrease it.A combined application of N and Ca could promote the nitrate reductase activity. Both soil NO33--N content and electric conductivity (EC) were increased with the increasing amount of applied fertilizer N.

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