NL-Z1 Induced an Imposed Effect to Promote the Leguminous Plant Growth.

It is found effective for phytoremediation of the guest soil spraying method by adding microbes to promote the growth of arbor leguminous plant on a high and steep rock slope. However, its underlying mechanisms remain elusive. Here, some experiments were conducted to explore the multifunctions of NL-Z1 on rock weathering, nodule growth, and beneficial microbial regulation. The results show that NL-Z1 significantly increased the release of phosphorus, potassium, calcium, and magnesium from the rock by 226, 29, 24, and 95%, respectively, compared with that of the control. A significant increase of 153% in nodule biomass, accompanied by an increase of 37% in the leguminous plant biomass was observed in the NL-Z1 treatment than in the control treatment. Interestingly, even though NL-Z1 itself became a minor microbial community in the soil, it induced a significant increase in , which, as a beneficial microbe, can promote phosphate-solubilizing and plant growth. The results suggest that NL-Z1 could induce an imposed effect to promote leguminous plant growth, which may be conducive to the development of the phytoremediation technique for high and steep rock slope. The study provides a novel thought of using the indirect effect of microbes, i.e., promoting other beneficial microbes, to improve soil environment.