三门峡烟区烤烟总氮与土壤氮素含量的分布特点及关系分析

测定三门峡烟区159份烤烟样品总氮含量和238份土壤样品氮含量,分析两者的分布特点及相互关系。结果表明:三门峡烟区烤烟总氮含量适宜,平均为1.46%±0.35%,变幅为0.85%~2.53%,43.39%的烟叶样品总氮含量落在1.50%~3.00%之间;不同等级烟叶总氮含量变化规律是B2F>C3F>X2F。三门峡烟区土壤全氮含量较高,平均值为0.76±0.15 g/kg,变幅为0.37~1.58 g/kg,有6.38%的土壤样品全氮含量高于1.00 g/kg;土壤碱解氮含量适宜,平均值为66.41±16.70 mg/kg,变幅为34.90~132.74 mg/kg,有3.36%的土壤样品碱解氮含量高于110 mg/kg,不同县市土壤碱解氮含量变化规律是灵宝>陕县>卢氏>渑池。烤烟总氮含量与土壤碱解氮含量呈显著正相关,在相关分析的基础上,建立了土壤碱解氮和烤烟总氮含量的线性回归方程。烤烟总氮含量随着土壤碱解氮含量的增加而增加。

Distribution and Relationship of Nitrogen Content in Flue-cured Tobacco Leaf and Soil in Sanmenxia Tobacco Districts

The nitrogen contents in 159 flue-cured tobacco leaf samples and 238 soil samples in Sanmenxia tobacco districts were determined,and their distribution and relationship were analyzed.The results indicated that the nitrogen content in flue-cured tobacco leaf was suitable in total,which ranged from 0.85% to 2.53% with the mean of 1.46%±0.35%,and the nitrogen content in 43.39% of tobacco leaf samples was located in the range of 1.50%~3.00%;the order of the nitrogen content in different grades of flue-cured tobacco leaf was B2F>C3F>X2F.Total nitrogen content in the soil was high,which ranged from 0.37 g/kg to 1.58 g/kg with the mean of(0.76±0.15) g/kg,and the total nitrogen content in 6.38% of soil samples was more than 1.00 g/kg.Alkali-hydrolyzable nitrogen content was suitable,which ranged from 34.90 mg/kg to 132.74 mg/kg with the mean of(66.41±16.70) mg/kg,and 3.36% of soil samples had high alkali-hydrolyzable nitrogen content(≥110 mg/kg).The order of alkali-hydrolyzable nitrogen content in the soil of different counties was Lingbao>Shanxian>Lushi>Mianchi.The nitrogen content in flue-cured tobacco leaf had significant positive correlation at 0.05 level with alkali-hydrolyzable nitrogen content in soil,and the multiple regressive equations were built between the alkali-hydrolyzable nitrogen content in soil and the nitrogen content in flue-cured tobacco leaf.The nitrogen content in flue-cured tobacco leaf increased along with the increase of soil alkali-hydrolyzable nitrogen content.