资源描述：
《黄河流域棉区早衰棉田土壤肥力综合评价》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、棉花学报CottonScience2015袁27渊3冤院241―247黄河流域棉区早衰棉田土壤肥力综合评价*刘连涛袁孙红春袁张永江袁王春山袁宋世佳袁陈静袁李存东渊河北农业大学农学院/河北省作物生长调控实验室袁河北保定071001冤摘要院通过调查黄河流域棉区149个采样点早衰棉田和正常棉田土壤养分情况袁构建土壤综合肥力指数渊Inte-gratedfertilityindex,IFI冤袁研究引起棉花早衰发生的土壤养分原因遥结果表明院早衰棉田土壤肥力各指标均低于正常棉田袁其中0～20cm土层的有机质和钾含量差异极显著遥调查区域0～20cm土层袁正常生长棉田的IFI值为0.4
2、1袁早衰棉田仅为正常棉田的75.6%曰20～40cm土层的IFI值显著低于0～20cm土层袁正常棉田的IFI值为早衰棉田的1.67倍遥土层各肥力指标对IFI影响的直接通径系数0～20cm从大到小的顺序为速效钾尧速效磷尧全氮尧有机质尧碱解氮含量袁20～40cm从大到小的顺序为为速效钾尧速效磷尧有机质尧全氮含量曰间接通径系数0～20cm土层从大到小的顺序是碱解氮尧全氮尧速效磷尧速效钾尧有机质含量曰20～40cm从大到小的的顺序为有机质尧全氮尧速效钾尧速效磷含量遥综合分析袁IFI与棉花早衰密切相关袁其值越小越易引起早衰的发生袁其中钾素和碱解氮分别是对IFI产生直接影响和间接
3、影响的最大营养元素袁大田生产中需要合理施入钾肥和氮肥袁合理调节IFI值袁方能有效防控因土壤肥力引发的棉田早衰的发生遥关键字院棉花曰早衰曰土壤肥力曰综合评价中图分类号院S562.01文献标识码院A文章编号院1002-7807渊2015冤03-0241-0710.11963/issn.1002-7807.201503007*LiuLiantao,SunHongchun,ZhangYongjiang,WangChunshan,SongShijia,ChenJing,LiCundong渊071001,冤Toanalyzetheinfluenceofsoilnutrientso
4、ncottonsenescence,weinvestigatedfieldsoilnutrientsofprematuresenes-cenceandnormalcottonat149samplingpointsintheYellowRiverregion,andestablishedasoilintegratedfertilityindex(IFI).Theresultsshowedthatallsoilfertilityindexesofprematuresenescencecottonfieldsweresmallerthanthoseofnormalcotto
5、nfields,andthatthedifferencewasextremelysignificant.Inthe0-20cmsoillayer,thedifferencesinorganicmatterandthepotas-siumcontentreachedextremelysignificantlevelscomparedwithnormalfields.TheaverageofIFIinnormalfieldsis0.41,butintheprematuresenescencecottonfields,theaverageofIFIwas75.6%ofthi
6、s,anextremelysignificantdifference.Inthe20-40cmsoillayer,theIFIwaslowersignificantlythanthatofthe0-20cmsoillayer,andtheaverageofIFIvalueofnormalcottonfieldswas1.67timesthatofprematuresenescencecottonfields.Inthe0-20cmsoillayer,theorderofdirectpathcoefficientfromlargesttosmallestwasavail
7、ablepotassium,availablephosphorus,totalnitrogen,organicmatter,andalkali-hydrolyzablenitro-gen.Inthe20-40cmsoillayer,theorderwassoilavailableK,availableP,organicmatter,andtotalnitrogen.Inthe0-20cmsoillayer,theorderofindirectdiametercoefficientfromlargesttosmallestwasnitrogen,tot
