尽管污水(SW)是营养的来源,它还会导致重金属在土壤中的积累;特别是,土壤中的铅(Pb)污染是农业中的严重问题。土壤污染物限制了养分对植物的生物利用度。所以,它们影响植物生长和生产质量。因此,进行了盆栽试验,以研究沸石土壤改良剂对SW灌溉番茄作物中Pb积累的影响。用不同浓度的沸石对SW灌溉植物的盆栽培养基进行了修正,viz.,0.75%,1.50%,和2.25%。结果表明,0.75%沸石的应用增加了叶面积,植物高度,水果数量,将新鲜和干燥的生物质种植37%,17%,14%,24%,与淡水灌溉相比,为7%。此外,与SW灌溉植物(55.13SPAD)相比,最低的沸石剂量也导致更高的叶绿素含量(68.02SPAD)。同样的生理特征,如A,gs,E,在0.75%沸石处理的植物中,比SW灌溉的植物高(分别为17.68µmolm-2s-1,gs0.28mmolm-2s-1和7.88mmolm-2s-1)(分别为12.99µmolm-2s-1,0.19mmolm-2s-1和7.00mmolm-2s-1)。相反,在低剂量沸石施用的植物中观察到过氧化氢和丙二醛水平降低以及抗氧化酶活性降低。与SW灌溉植物相比,沸石减少了番茄植物中的Pb积累,因此,SW灌溉植物果实中的Pb积累量比SW沸石处理植物高80%。最后,这项研究揭示了SW灌溉番茄植物的形态和生理生长属性的改善,以响应沸石的应用。
Although sewage water (SW) is a source of nutrients, it also causes heavy metal accumulation in soil; especially, lead (Pb+) contamination of soil is a serious concern in agriculture. Soil contaminants limit the bioavailability of nutrients to plants. So, they affect plant growth and produce quality. Therefore, a pot experiment was conducted to investigate the effect of zeolite soil amendment on the accumulation of Pb+ in tomato crop grown with SW irrigation. The pot media of SW-irrigated plants was amended with different concentrations of zeolite, viz., 0.75%, 1.50%, and 2.25%. The results showed that the application of 0.75% zeolite increased leaf area, plant height, fruit number, and plant fresh and dry biomasses by 37%, 17%, 14%, 24%, and 7% compared to freshwater irrigation. Moreover, the lowest zeolite dose also led to higher chlorophyll content (68.02 SPAD) compared to SW-irrigated plants (55.13 SPAD). Similarly physiological traits, such as A, gs, and E, were higher (17.68 µmol m-2 s-1, gs 0.28 mmol m-2 s-1, and 7.88 mmol m-2 s-1, respectively) in 0.75% zeolite-treated plants than in SW-irrigated plants (12.99 µmol m-2 s -1, 0.19 mmol m-2 s-1, and 7.00 mmol m-2 s -1, respectively). On the contrary, a reduced level of hydrogen peroxide and malondialdehyde and decreased activity of antioxidant enzymes were observed in low-dose zeolite applied plants. Zeolite reduced Pb+ accumulation in tomato plants as compared to SW-irrigated plants, whereby Pb accumulation in the fruits of SW-irrigated plants was 80% more than those of zeolite + SW-treated plants. Conclusively, this study has revealed the improvement in morphological and physiological growth attributes of the SW-irrigated tomato plant in response to zeolite application.