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玉米叶片SPAD值、全氮及硝态氮含量的品种间变异
引用本文:蔡红光,米国华,陈范骏,张秀芝,高强.玉米叶片SPAD值、全氮及硝态氮含量的品种间变异[J].植物营养与肥料学报,2010,16(4):866-873.
作者姓名:蔡红光  米国华  陈范骏  张秀芝  高强
作者单位:1.吉林农业大学资源与环境学院,吉林长春 130118;
基金项目:农业部"948"项目,支撑计划 
摘    要:研究比较两种土壤肥力条件下,4个春玉米品种在喇叭口期至成熟期间叶片SPAD值、全氮及硝态氮含量的变异程度、及其与氮素积累和产量形成的关系,以期为不同品种植株的氮素营养测试指标的优化提供依据。结果表明,叶片SPAD值与产量、吸氮量及生物量呈显著相关,该值主要受氮肥水平影响,并因土壤肥力而变异。从喇叭口期至灌浆期间平均变异幅度为17.7%,但品种间变异很小,平均仅为4.3%。说明利用SPAD值诊断玉米氮素营养时,其诊断指标不需要因品种而调整,但需要因不同肥力而调整。在新立城低肥力条件下,喇叭口期(V12)和抽雄期(VT)的SPAD临界值指标分别为46.1和57.8;在德惠高肥力条件下,两个时期的SPAD值临界值较为接近,分别为59.9和60.3。植株叶片硝态氮含量在土壤肥力间及品种间变异均较大,变异幅度分别为43.1%和29.3%,且与产量、吸氮量及生物量的相关性均较差,不适于在大面积范围内单独作为玉米氮素营养状况的评价指标。

关 键 词:玉米    叶片SPAD值    叶片全氮    叶片硝态氮
收稿时间:2009-7-22

Genotypic variation of leaf SPAD value,nitrogen and nitrate content in maize
CAI Hong-guang,MI Guo-hua,CHEN Fan-jun,ZHANG Xiu-zhi,GAO Qiang.Genotypic variation of leaf SPAD value,nitrogen and nitrate content in maize[J].Plant Nutrition and Fertilizer Science,2010,16(4):866-873.
Authors:CAI Hong-guang  MI Guo-hua  CHEN Fan-jun  ZHANG Xiu-zhi  GAO Qiang
Institution:1.College of Resources and Environmental Sciences,Jilin Agricultural University,Changchun 130118,China;
Abstract:As the index of nitrogen(N)status diagnosis in crops, leaf SPAD value, N and nitrate content are affected by soil types, cultivars and maize growth stages. In order to optimize the index of N status diagnosis, leaf SPAD value, N and nitrate content of four cultivars of maize was investigated in two sites(Xinlicheng and Dehui)with three N rates. The results indicated that leaf SPAD value was significantly correlated with grain yield, N accumulation and biomass. The correlation coefficient was mainly influenced by nitrogen levels and soil fertility. The average variation during maize growth coefficient(CV)between two locations was 17.7%. In contrast, SPAD value was slightly affected by cultivars, and the CV among cultivars was only 4.3%, suggesting that the index of SPAD value need not to be adjusted with cultivars. In Xinlicheng where the soil fertility was low, the critical values of leaf SPAD were 46.1 and 57.8 at 12th leaf stage(V12) and tasselling(VT), respectively. In Dehui where the soil fertility was high, the critical SPAD values were 59.9 and 60.3 at V12 and VT, respectively. Leaf nitrate-N varied highly with soil fertility and cultivars, with the CV of 43.1% and 29.3%, respectively. Furthermore, the correlation coefficients between leaf nitrate-N content and grain yield, N accumulation and biomass were not significant. Therefore, the leaf nitrate-N was not appropriate as a sole index for evaluating plant N status diagnosis at large scale.
Keywords:maize  leaf SPAD value  leaf N content  leaf nitrate content
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