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1、内蒙古农业科技2014（2）：21~23InnerMongoliaAgriculturalScienceAndTechnology盐肥耦合对玉米种子萌发和幼苗生长的影响宋瑶1，李跃进1，杨夏平2，景宇鹏1，蔺亚莉1，范浩1（1.内蒙古农业大学生态环境学院，内蒙古呼和浩特010018；2.呼和浩特市赛罕区农业综合开发办公室，内蒙古呼和浩特010010）摘要：通过室内水培和室外盆栽试验，研究了不同浓度混合盐(含93%的Na2SO4、5%的NaCl、2%的NaHCO3)和不同施肥水平耦合对玉米种子萌发和幼苗生长的影响。结果表明：随着盐分浓度的增加，玉米种子的发
2、芽率降低，盐害指数增大。在同一盐分水平下，随着施肥量的增加盐害指数呈现先降低后升高的趋势,在氮磷合计浓度为0.036%时，盐害指数最小；玉米种子的芽长、根长、根数均随盐分浓度的增加而降低，对根的盐害作用大于对芽的盐害作用。随着施肥量的增加，芽长、根长、根数相比对照均有所降低，且降低幅度根长大于芽长。随着含盐量增加，玉米幼苗的株高呈降低趋势，在玉米生长27d中，株高随施肥量的增加而降低；在生长36～45d时，含盐量低于0.4%，施氮量60.75kg/hm2、施磷量186.75kg/hm2能有效促进玉米的生长，当含盐量高于0.6%时，施氮量60.75kg/h
3、m2、施磷量186.75kg/hm2开始明显抑制玉米生长。关键词：盐肥耦合；玉米；发芽；幼苗生长中图分类号:S513文献标识码:A10.3969/j.issn.1007-0907.2014.02.010文章编号:1007-0907(2014)02-0021-03TheInfluenceofSalt-fertilizerCouplingonCornSeedGerminationandSeedlingGrowthSONGYao（CollegeofEcologyandEnvironmentalScience,InnerMongoliaAgriculturalU
4、niversity,Hohhot010018,China）Abstract:Throughtheindoorhydroponicsandoutdoorpotexperiment,theeffectsofdifferentconcentrationsofmixedsalts(containing93%Na2SO4,5%ofNaCl,2%ofNaHCO3)anddifferentfertilizerlevelscoupledwereexplored,whichhavebiginfluencesforseedgerminationandseedlinggrow
5、th.Theresultsshowthat:withtheincreasingconcentrationofsalt,thecorn'sgerminationratedecreased,thesaltinjuryindexincreased.Inthesamesalinitylevel,withincreasingamountsoffertilizer,saltinjuryindexshowedatrendofincreasedfirstandthendecreased,whentheNPtotalconcentrationwas0.036%,thesa
6、ltinjuryindexminimum.Thecornseed'sshootlength,rootlength,andnumberofrootsdecreasedwhenthesaltconcentrationsincreased.Thesaltdamageforrootswasgreaterthanbuds.Withtheincreasedamountoffertilizer,theshootlength,rootlength,androotnumberdecreasedcomparedtothecontrol,andthemagnitudesofd
7、ecreaseforrootwasgreaterthanbud.Withtheincreasedsalinity,theplantheightofcornseedlingsdecreased.Inthe27daysofcorngrowth,theheightwasdecreasingwithanincreasingfertilizer.Whenthecorngrowthwasbetween36dand45d,thesalinitywaslessthan0.4%.UsingNitrogen60.75kg/hm2,andPhosphate186.75kg/h
8、m2,promotedthecorngrowtheffectively.When
