原子吸收法测定番茄在不同生育期常量及微量营养元素的含量

ASSAY OF NUTRIENT ELEMENTS IN TNE TOMATO PLANT AT DIFFERENT GROWTH STAGES BY ATOMIC ABSORPTION SPECTROMETRY

利用原子吸收光谱分析测定了番茄植株在不同生育期若干营养元素的含量。结果表明：在幼苗、营养生长、生殖生长３个生育期的同期比较中，４种微量元素Ｆｅ，Ｚｎ，Ｃｕ，Ｍｎ在其根部含量高于茎部和叶部的含量。幼苗期Ｆｅ的加权平均浓度远高于营养生长和生殖生长期。Ｚｎ和Ｃｕ表现出营养生长期的加权平均浓度较高，而该时期Ｍｎ则最低。４种宏量元素Ｍｇ，Ｃａ，Ｋ，Ｎａ则是，在３个生育期中，叶部的Ｃａ含量高于茎部和根部的，而茎部的Ｋ含量高于根部和叶部的。番茄植株中Ｃａ的加权平均浓度随生长发育逐渐递增，而Ｋ则逐渐递减。Ｍｇ含量表现出在幼苗期根部最高，营养生长期茎部最高，生殖生长期叶部最高。番茄植株中尚含有一定量的Ｎａ。

Some nutrient elements in tomato plants at different growing stages were assayedby atomic absorption spectrometry. It was found that the levels of 4 microelements,namelyFe,Zn,Cu and Mn were higher in the root than the corresponding levels in the stem and leafat the seedling,vegetative growth and reproductive stages. The weighted average of Fe con-centration at the seedling stage was far above those for the vegetative growth and reproduc-tive stages. At the vegetative growth stage the weighted average levels of Zn and Cu wererather high whereas that of Mn was the lowest. The levels for the macroelements Mg,Ca,Kand Na were as follows:At all three stages of growth the Ca level of the leaf was higher thanthose of the stem and root,whereas the K level in the stem was higher than those of the rootand leaf. During growth of the tomato plant,the weighted average level of Ca showedgradual incremental increase whereas that of K exhibited incremental decrease. As toMg,for the seedling stage the content was highest in the root,for the vegetative growthstage highest in the stem,and for the reproductive stage highest in the leaf. A certain amountof Na was present also in the plant.