水培生菜临界氮浓度曲线模型构建和氮营养诊断  

Establishment of Critical Nitrogen Concentration Curve Model for Hydroponic Lettuce and Diagnosis of Nitrogen Nutrition

作　　者：尹艺璐 钱婷婷[2] 李达仁 熊鑫[1] 常丽英[1] YIN Yilu;QIAN Tingting;LI Daren;XIONG Xin;CHANG Liying(School of Agriculture and Biology,Shanghai Jiao Tong University,Shanghai 200240;Shanghai Academy of Agricultural Sciences,Shanghai 201403)

机构地区：[1]上海交通大学农业与生物学院,上海200240 [2]上海市农业科学院,上海201403

出　　处：《北方园艺》2021年第13期19-25,共7页Northern Horticulture

基　　金：上海市科技兴农资助项目(2020-02-08-00-08-F10468)。

摘　　要：以生菜为试材,采用营养液培养法,研究了4种不同施氮水平(T10mmol·L^(-1)、T2 3.25mmol·L^(-1)、T3 6.50mmol·L^(-1)、T4 9.25mmol·L^(-1))对水培生菜的地上部干质量及氮浓度的影响,构建了水培生菜的临界氮浓度曲线模型,并得出氮素吸收模型、氮素亏缺模型和氮营养指数模型,以期为水培生菜的氮营养诊断提供参考依据。结果表明:水培生菜的地上部干质量和氮浓度满足幂函数关系,临界氮浓度稀释曲线模型为%N_c=3.769DW^(-0)_(max).^(343),决定系数R^(2)=0.903,同时得出最高和最低氮浓度稀释曲线,决定系数分别为R^(2)=0.891、R^(2)=0.906;水培生菜的氮吸收模型、氮亏缺模型和氮营养指数模型较好地实现了氮营养诊断。3种模型诊断结果基本一致,生育前期以6.50mmol·L^(-1)处理为宜,后期最适施氮水平应处于3.25~6.50mmol·L^(-1)。The critical nitrogen concentration dilution curve of lettuce was constructed,through the hydroponic cultivation experiments with four different levels of nitrogen treatments(T10.00 mmol·L^(-1),T23.25 mmol·L^(-1),T36.50 mmol·L^(-1),T49.25 mmol·L^(-1)).On this basis,the nitrogen uptake,nitrogen deficiency and nitrogen nutrition index model were obtained,in order to diagnose the nitrogen nutrition more precisely.The results showed that there was a power function relationship betweenplant aboveground biomass and nitrogen concentration(R^(2)=0.903).Then the highest and lowest nitrogen concentration dilution curve model were derived,and the coefficients of determination were R^(2)=0.891 and R^(2)=0.906,respectively.The nitrogen uptake,nitrogen deficiency and nitrogen nutrition index model of hydroponic lettuce had the same nitrogen nutrition diagnosis results,and the optimum applications of nitrogen in the early and later period were 6.50 mmol·L^(-1) and between3.25-6.50 mmol·L^(-1),respectively.This study provided a theoretical basis for the precise management of nitrogen in hydroponic lettuce.

关 键 词：水培生菜 临界氮浓度曲线 氮营养诊断 

分 类 号：S636.2[农业科学—蔬菜学]