福建比利时杜鹃叶片矿质营养含量的研究

Concentrations of mineral nutrition in the leaves of Rhododendron hybridum growing in Fujian

分别用凯氏定氮法、钼蓝比色法、火焰光度法和原子吸收分光光度法,对市场上生长良好的福建比利时杜鹃花叶片N、P、K、Ca、Mg、Fe、Mn、Cu、Zn的含量进行了测定,并运用数理统计方法和SPSS软件对测定结果进行了分析。结果表明,未成熟叶片中各营养元素含量分别为N 32.9 g/kg,P 4.6 g/kg,K 22.6 g/kg,Ca 23.9 g/kg,Mg 3.4 g/kg,Fe 1 23.3 mg/kg,Mn 249.2 mg/kg,Cu 27.5 mg/kg,Zn 163.2 mg/kg。活性Fe的含量为12.3 mg/kg。N、P、K的比例为1∶0.14∶0.69。成熟叶片中营养元素含量分别为N 28.0 g/kg,P 4.2 g/kg1,K 24.2 g/kg,Ca 24.9g/kg,Mg 3.6 g/kg,Fe 265.5 mg/kg,Mn 354.3 mg/kg,Cu 19.8 mg/kg,Zn 142.3 mg/kg。活性Fe的含量为18.0 mg/kg。N、P、K的比例为1∶0.15∶0.87。该分析结果可供其他地区生长不良的杜鹃进行营养诊断时参考,以改善杜鹃生长不良的状况。

The best rhododendron on the market is Rhododendron hybridum from Fujian . We analyzed the concentrations of N,P,K, Ca, Mg, Fe,Mn, Cu and Zn in their leaves by the Kjeldahl＇ s method of nitrogen fixation, molybdenum blue spectrophotometry, flame spectrometry and atomic absorption spectrophotometry. The data were analyzed by statistics and SPSS. The results are as follows： The concentrations of mineral nutrition in young leaves were N 32.9 g/kg, P 4.6 g/kg, K 22.6 g/kg, Ca 23.9 g/kg,Mg 3.4 g/kg,Fe 123.3 mg/kg,Mn 249.2 mg/kg, Cu 27.5 mg/kg,Zn 163.2 mg/kg.The concentration of the active Fe was 12.3 mg/kg.The nutrients ratio of N,P and K was 1：0.14：0.69. Correspondingly,the concentrations of mineral nutrition in mature leaves was N 28.0 g/kg, P 4.2g/kg, K 24.2 g/kg, Ca 24.9 g/kg, Mg 3.6 g/kg, Fe 265.5 mg/kg, Mn 354.3 mg/kg,Cu 19.8mg/kg,Zn 142.3 mg/kg. The concentration of the active Fe was 18.0 mg/kg .The nutrients ratio of N,P and K was 1：0.15：0.87. The results can be used in diagnosing the malnutrition rhododendron in other areas in order to improve the status of its growth.