Enhancing Soil Health and Tobacco Quality: The Synergistic Effects of Biochar and Biodegradable Mulch Film on Chromium Mobility and Plant Growth

A study showed that combining biochar (BC) and biodegradable mulch film (BMF) significantly reduces soil chromium levels and enhances tobacco growth. This combination decreased chromium availability and increased plant biomass, suggesting it as a sustainable solution for improving crop yield and soil health amidst heavy metal pollution.

March 27, 2024

1–2 minutes

Yang, et al (2024) Combined effects of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More and biodegradable mulch film on chromium bioavailability and the agronomic characteristics of tobacco. Scientific Reports. https://doi.org/10.1038/s41598-024-56973-8

In recent agricultural practices, the individual and combined use of biochar (BC) and biodegradable mulch film (BMF) has shown promising results in enhancing soil quality and crop productivity. A significant study has delved into the effects of these materials, both separately and together, on soil heavy metal pollution, particularly focusing on chromium (Cr) mobility and the agronomic characteristics of flue-cured tobacco.

The study revealed that the application of BMF, BC, and their combination (CMB) substantially reduced the levels of diethylenetriamine pentaacetic acid (DTPA) extractable Cr in soils. This reduction ranged from 29.07–29.75% for BMF, 45.35–48.54% for BC, and 34.21–37.92% for the combined application, compared to untreated controls. Notably, the co-application of BMF and BC outperformed their individual applications by enhancing Cr adsorption and soil enzyme activity, leading to lower Cr bioavailability and plant bioconcentration factors.

Furthermore, the synergistic effect of CMB on tobacco plants was evident through improved plant height, stem diameter, leaf area, total root area, root tip number, and root activity. These improvements resulted in significant increases in leaf and root biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More, by 11.40–67.01% and 23.91–50.74% respectively, compared to controls. Consequently, CMB application not only mitigated heavy metal residues in tobacco leaves but also enhanced the yield and quality of the tobacco crop.

This study underscores the effectiveness of combining BC and BMF as a sustainable agricultural practice to reduce heavy metal pollution in soils, particularly Cr, while improving crop yield and quality. The findings advocate for the wider adoption of such practices to promote sustainable land use and ensure the safety of crop production and human health amidst increasing environmental concerns.