氮和钙交互作用对番茄氮素吸收的影响

摘要/Abstract

摘要： 以沈阳草甸土为栽培基质,采用二次D-饱和最优设计,进行番茄N、Ca两因素效应的盆栽试验.结果表明,在本试验条件下,番茄茎、叶、果实中氮素含量随生育期的进展而下降,氮肥对番茄果实中NO₃3^--N含量影响呈直线正效应,但各处理番茄果实中NO₃3^--N含量均不超过可生食标准.适量施用钙肥有利于控制果实中NO₃3^--N含量.氮肥对番茄植株地上部分和果实中N含量影响均符合报酬递减律.氮肥和钙肥对番茄N素积累符合报酬递减律;番茄从开花期到果实膨大期属N素最大效应期.番茄叶片硝酸还原酶活性受氮素影响较大.N、Ca配合施用,有利于提高番茄叶片硝酸还原酶活性,钙素可降低硝酸还原酶活性.土壤中NO₃3^--N含量和电导率EC值均随氮肥施用增加而提高.

关键词: 番茄, 氮肥, 养分吸收, 钙肥

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.

Key words: Tomato, Nitrogen fertilizer, Nutrient uptake, Calcium fertilizer

中图分类号:

S143

娄春荣, 韩晓日, 肖千明, 孙文涛, 邱卫文, 付仲鑫. 氮和钙交互作用对番茄氮素吸收的影响[J]. 应用生态学报, 2004, (4): 667-672.

LOU Chunrong, HAN Xiaori, XIAO Qianming, SUN Wentao, QIU Weiwen, FU Zhongxin . Interactive effect of N and Ca on N uptake by tomato[J]. Chinese Journal of Applied Ecology, 2004, (4): 667-672.

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