Biosystems Engineering Department, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Department of Horticultural Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Biol Trace Elem Res. 2021 Feb;199(2):753-762. doi: 10.1007/s12011-020-02171-2. Epub 2020 May 11.
To investigate the effect of harvest height on the amassed elements and ash content of Hyssop (Hyssopus officinalis L.), an experiment was conducted in a randomized complete block design with three replications. Treatments included four harvest heights, i.e., 15, 25, 35, and 45 cm (from the tip of the plant) and the residual stalks. The dependent variables were the amassed content of elements N, K, P, Ca, Mg, Cu, Zn, and Pb in different heights of the plant and the associated ash content (total ash (TA), acid-insoluble ash (AA), and water-insoluble ash (WA)). The results showed that by moving from the upper shoots toward the ground, the amassed content of Mg, Ca, Cu, Zn, and Pb increased by 22.67%, 43.74%, 12.87%, 39.02%, and 85.04%, respectively. Further, a downward trend was observed for N (50.16%) and K (6.41%) content, while an upward trend reported for P (29.06%) content. As for the residual stalks, by moving from the upper shoots toward the ground, Mg, Ca, Cu, Zn, and Pb contents decreased by 1.01%, 21.03%, 9.11%, 17.02%, and 51.06%, respectively, while N and P contents increased by 60.59% and 3.15%, respectively, and a 34.74% increase was seen in P content. With increasing harvest height, TA, AA, and WA values increased by 33.48%, 27.03%, and 18.25%, respectively. As for the residues, these variables increased by 11.44%, 6.35%, and 5.22%, respectively. Our results showed that 15 cm harvest height had the highest quality with the lowest heavy metal content. Graphical Abstract.
为了研究收获高度对穗花薰衣草（Hyssopus officinalis L.）积累元素和灰分含量的影响，采用随机完全区组设计进行了一项实验，设 3 次重复。处理包括 4 个收获高度，即 15、25、35 和 45 cm（从植株顶部算起）和剩余茎秆。因变量为不同植株高度的元素 N、K、P、Ca、Mg、Cu、Zn 和 Pb 的积累量以及相关的灰分含量（总灰分（TA）、酸不溶灰分（AA）和水不溶灰分（WA））。结果表明，从上部嫩枝向地面移动，Mg、Ca、Cu、Zn 和 Pb 的积累量分别增加了 22.67%、43.74%、12.87%、39.02%和 85.04%。此外，N（50.16%）和 K（6.41%）含量呈下降趋势，而 P（29.06%）含量呈上升趋势。至于剩余茎秆，从上部嫩枝向地面移动，Mg、Ca、Cu、Zn 和 Pb 的含量分别减少了 1.01%、21.03%、9.11%、17.02%和 51.06%，而 N 和 P 的含量分别增加了 60.59%和 3.15%，P 含量增加了 34.74%。随着收获高度的增加，TA、AA 和 WA 值分别增加了 33.48%、27.03%和 18.25%。至于残留物，这些变量分别增加了 11.44%、6.35%和 5.22%。我们的结果表明，收获高度为 15 cm 时具有最高的品质，重金属含量最低。
