Combining waste biomass with functional microorganisms can effectively ameliorate hardened saline-alkali soil and promote plant growth

Abstract

Background and aims

Soil salinization, a prevalent ecological issue in China and even worldwide, has resulted in soil compaction, which has emerged as a crucial barrier to agricultural economic development in northwest China.

Methods

In this study, a soil amendment (D2) was created using microorganisms capable of dissolving phosphorus, fixing nitrogen, and releasing potassium, as well as waste biomass carriers such as corn cobs, pine needles, bone meal and seashell powder, with the aim of revitalizing hardened saline-alkali soil and improving its overall quality.

Results

The potted plant experiment verified that D2 application over 60 days notably boosted soil enzyme activity, organic matter, porosity, and water retention, while reducing soil pH and bulk density, signifying a healthier soil environment. Concurrently, it significantly promoted plant growth, increased rhizosphere microbial diversity and abundance of genes related to soil carbon, nitrogen, and phosphorus cycling, underscoring D2's potential as a sustainable soil conditioner that significantly enhances soil environment quality.

Conclusion

D2 has demonstrated excellent ability to remediate hardened saline-alkali soil, making it an environmentally friendly and sustainable alternative to traditional chemical amendments.