Liu Ziyan, Zhou Ming, Liao Wufang, Liu Jiayi, Luo Chaogui, Lu Chunyan, Chen Zhiwen, Zhu Hongwei
School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.
Guangxi Earthmoving Machinery Collaborative Innovation Center, Liuzhou 545006, China.
Materials (Basel). 2023 Mar 24;16(7):2578. doi: 10.3390/ma16072578.
Soil nutrient loss, which leads to low plant utilization, has become an urgent issue. Graphene can improve soil fertilizer-holding properties given its small size effect, strong adsorption properties, and large specific surface area. Herein, different amounts of graphene were added to soil samples to study its effect on soil nutrient retention and growth of pepper seedlings. The colloidal double electric layer theory forms the basis for an analysis of variations in soil nutrient concentration through measurements of the zeta potential, which is affected by variations in ion concentrations in soil colloids. We measured the zeta potential of graphene and soil mixed colloids and found that graphene could increase the concentration of nutrient ions in soil colloids. In addition, graphene reduced the loss of nutrients; increased the contents of ammonium nitrogen, effective phosphorus, and fast-acting potassium in the soil after leaching; and enhanced the stability of soil aggregates after leaching. In addition, pepper seedlings grown under graphene treatment for 60 days outperformed seedlings grown without graphene treatment, in terms of plant height and nutrient content. This study demonstrates that the addition of graphene to soil can reduce nutrient loss and promote fertility and plant growth.
土壤养分流失导致植物利用率低下，已成为一个亟待解决的问题。石墨烯因其小尺寸效应、强吸附性能和大比表面积，能够改善土壤保肥性能。在此，向土壤样品中添加不同量的石墨烯，以研究其对土壤养分保持及辣椒幼苗生长的影响。胶体双电层理论是通过测量受土壤胶体中离子浓度变化影响的ζ电位来分析土壤养分浓度变化的基础。我们测量了石墨烯与土壤混合胶体的ζ电位，发现石墨烯能够增加土壤胶体中营养离子的浓度。此外，石墨烯减少了养分流失；增加了淋溶后土壤中铵态氮、有效磷和速效钾的含量；并增强了淋溶后土壤团聚体的稳定性。此外，经石墨烯处理60天的辣椒幼苗在株高和养分含量方面优于未经过石墨烯处理的幼苗。本研究表明，向土壤中添加石墨烯可减少养分流失，促进土壤肥力和植物生长。
