Department of Agronomy, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, 46300, Punjab, Pakistan.
Institute of Soil Science, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, 46300, Punjab, Pakistan.
Sci Rep. 2021 Jun 2;11(1):11540. doi: 10.1038/s41598-021-91080-y.
Recently, there is an increasing trend of using metallic nanoparticles (NPs) in agriculture due to their potential role in remediating soil pollution and improving nutrient utilization from fertilizers. However, evidence suggested that these NPs were toxic to the soil life and their associated functions, and this toxicity depended on their dose, type, and size. Here, a dose-dependent (5, 50, and 100 mg kg soil) toxicity of NiO NPs on poultry manure (PM: 136 kg N ha) decomposition, nutrient mineralization, and herbage N uptake were studied in a standard pot experiment. The NPs doses were mixed with PM and applied in soil-filled pots where then ryegrass was sown. Results revealed that the lowest dose significantly increased microbial biomass (C and N) and respiration from PM, whereas a high dose reduced these parameters. This decrease in such parameters by the highest NPs dose resulted in 13 and 41% lower soil mineral N and plant available K from PM, respectively. Moreover, such effects resulted in 32 and 35% lower herbage shoot and root N uptakes from PM in this treatment. Both intermediate and high doses decreased herbage shoot Ni uptake from PM by 33 and 34%, respectively. However, all NPs doses did not influence soil Ni content from PM. Hence, our results indicated that high NPs dose (100 mg kg) was toxic to decomposition, nutrient mineralization, and herbage N uptake from PM. Therefore, such NiONPs toxicity should be considered before recommending their use in agriculture for soil remediation or optimizing nutrient use efficiency of fertilizers.
最近，由于金属纳米粒子（NPs）在修复土壤污染和提高肥料中养分利用率方面的潜在作用，它们在农业中的应用呈上升趋势。然而，有证据表明，这些 NPs 对土壤生物及其相关功能具有毒性，这种毒性取决于它们的剂量、类型和大小。在这里，我们进行了一项标准盆栽实验，研究了 NiO NPs 对鸡粪（PM：136kgNha）分解、养分矿化和牧草氮吸收的剂量依赖性（5、50 和 100mgkg-1 土壤）毒性。将 NPs 剂量与 PM 混合，并施加到装满土壤的盆中，然后在盆中播种黑麦草。结果表明，最低剂量显著增加了 PM 中的微生物生物量（C 和 N）和呼吸作用，而高剂量则降低了这些参数。最高 NPs 剂量下这些参数的减少导致 PM 中的土壤矿质氮和植物有效钾分别减少了 13%和 41%。此外，这种处理导致 PM 中牧草地上部和根氮吸收量分别降低了 32%和 35%。中间剂量和高剂量分别使 PM 中牧草地上部的 Ni 吸收量减少了 33%和 34%。然而，所有 NPs 剂量均未影响 PM 中的土壤 Ni 含量。因此，我们的结果表明，高 NPs 剂量（100mgkg-1）对 PM 的分解、养分矿化和牧草氮吸收具有毒性。因此，在推荐将其用于土壤修复或优化肥料养分利用率之前，应考虑此类 NiONPs 的毒性。
