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.

研究收获高度对牛膝（Hyssopus officinalis L.）的积累元素和灰分的影响。），以随机重复的完整区块设计进行实验，并进行3次重复。处理包括四个收获高度，即距植物尖端15、25、35和45厘米（高）和残留的茎。因变量是植物不同高度的元素N，K，P，Ca，Mg，Cu，Zn和Pb的累积含量以及相关的灰分含量（总灰分（TA），酸不溶性灰分（AA）） ，以及水不溶性灰烬（WA））。结果表明，通过从上部芽向地面移动，镁，钙，铜，锌和铅的累积含量分别增加了22.67％，43.74％，12.87％，39.02％和85.04％。此外，N（50.16％）和K（6.41％）含量下降，而P（29.06％）含量上升。至于残留的茎，通过从上部芽向地面移动Mg，Ca，Cu，Zn和Pb的含量分别下降了1.01％，21.03％，9.11％，17.02％和51.06％，而N和P的含量分别上升了60.59％和3.15％，其中34.74％ P含量。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％。至于残基，这些变量分别增加了11.44％，6.35％和5.22％。我们的结果表明，15 cm的收获高度具有最高的质量，最低的重金属含量。这些变量分别增加了11.44％，6.35％和5.22％。我们的结果表明，15 cm的收获高度具有最高的质量，最低的重金属含量。这些变量分别增加了11.44％，6.35％和5.22％。我们的结果表明，15 cm的收获高度具有最高的质量，最低的重金属含量。