营养液氮浓度对烟草苗期矿质养分吸收与积累的影响

Effect of Nitrogen Concentration on Absorption and Accumulation of Mineral Nutrients During Tobacco Seedling Stage

为了阐述植烟土壤氮含量对烟株吸收积累主要矿质养分的影响,采用营养液培养的方法,研究了不同质量浓度氮对烟草苗期主要矿质养分吸收和积累的影响。结果表明,随营养液氮质量浓度的增加,烟草生物量呈先增加后降低的变化趋势,当营养液氮质量浓度为140mg/L时达最大值。随营养液氮质量浓度的增加,烟草全株氮含量和锌含量均增加,铜含量明显降低;磷、钾、镁、锰、钙含量先升高后降低,其中磷、钾、镁、锰含量在营养液氮质量浓度为280mg/L时达到最大值,而钙含量在氮质量浓度为140mg/L时达到最大值。随营养液氮质量浓度的增加,全株氮和镁积累量均增加;磷、钾、钙、锌、铜、锰在烟草体内积累量先增加后降低,其中磷、钾、钙、锌、锰积累量在氮质量浓度为140mg/L时达到最大值,而铜积累量在氮质量浓度为70mg/L时达到最大值。随营养液氮质量浓度的增加,烟草叶片氮和锌含量及其积累量均增加;磷、钾、镁、锰等含量及其积累量先增加后降低,氮质量浓度280mg/L时达到最大值,而钙含量及其积累量与全株中变化趋势一致。可见,适宜的氮质量浓度可促进烟株干物质积累,并影响烟株矿质养分的含量和积累量,进而影响烟叶产量和品质。

For elucidating the effect of N content in soil on absorption and accumulation of mineral nutrients in tobacco ,this paper studied the effect of N concentration on absorption and accumula-tion of several mineral nutrients by liquid culture during tobacco seedling stage .T he results showed that with the increase of N concentration ,the biomass of tobacco first increased and then decreased ,and reached a peak value when the N concentration was 140 mg/L .With the increase of N concentration ,the N and Zn content in the w hole tabacco increased ,but the Cu content de-creased;the content of P ,K ,Mg and Mn first increased and then decreased ,and reached a peak value when the N concentration was 280 mg/L ,so was the content of Ca ,but reached a peak value when the N concentration was 140 mg/L .With the increase of N concentration ,the accumulation of N and Mg in the w hole tabacco increased ;the accumulation of P ,K ,Ca ,Zn and Mn first in-creased and then decreased ,and reached a peak value when the N concentration was 140 mg/L ,so was the accumulation of Cu ,but reached a peak value when the N concentration was 70 mg/L . With the increase of N concentration ,the content and accumulation of N and Zn in tobacco leaves all increased ;the content and accumulation of P ,K ,Mg and Mn all first increased and then de-creased ,and reached a peak value when the N concentration was 280 mg/L ,the variation trend of content and accumulation of Ca in leaves was same to that in whole plant .So ,appropriate N con-centration could increase dry matter accumulation of tabacco ,affect the absorption and accumula-tion of mineral nutrients ,further affect the yield and quality of tobacco leaves .