广元市元坝区植烟土壤养分状况综合评价

采用主成分分析法和动态聚类法对广元市元坝区58个植烟土壤样品养分状况进行了综合评价,结果表明:元坝区各植烟乡镇土壤养分分布很不平衡;土壤pH值偏高,有效磷、有效钾、有效锰和氯含量大多不能满足烤烟生长需要,在生产上应注意通过施肥调节。58个土样养分综合得分可分为4级:Ⅰ级养分综合水平最高,得分值为2.2546~5.3471,占28.07%;Ⅱ级与Ⅰ级各养分差异不大,占31.58%;Ⅲ级得分值为-3.8801~-0.9169,占29.82%,其速效磷、速效钾、有效铁、有效硫含量显著低于Ⅰ级;Ⅳ级得分值为-8.1080~-5.0492,占10.53%,其交换性镁、有效铁、速效钾、速效磷、全氮、有机质、有效硫含量显著低于Ⅰ级。

Comprehensive Evaluation on Nutrients of Soil Samples Planting Tobacco in Yuanba Area of Guangyuan City

Comprehensive evaluation on nutrients of soil samples planted tobacco in Yuanba area,Guangyuan city by principal component analysis and dynamic clustering methods were.The results indicated that all townships planting tobacco in Yuanba area were very uneven distribution of soil nutrients;The pH values of soil samples were higher,and the contents of available P,available K,available Mn and Cl of soil samples were mostly could not meet tobacco needs,so that we should regulate nutrient content through fertiliz...