In the quest for global food security, particularly in regions with challenging agricultural lands, innovative solutions are crucial. A recent article in the Journal of Degraded and Mining Lands Management by P.H. Maharani, E. Maftu’ah, Y. Sulaeman, K. Napisah, M. Masganti, M. Mukhlis, K. Anwar, R.D. Ningsih, and N. Chairuman, highlights a promising approach to revitalize acid sulfate soils. Their research, titled “Integrated Rice Husk 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 Compost to Improve Acid Sulfate Soil Properties and Corn Growth,” demonstrates that specific combinations of soil amendments can significantly enhance both soil quality and crop yields.

Acid sulfate soils, common in many parts of the world, including Indonesia, pose significant challenges for agriculture. These soils are notoriously poor in quality, characterized by extreme acidity, nutrient deficiencies (especially phosphorus), and high levels of aluminum and iron toxicity. Such conditions severely limit crop growth and overall land productivity. Traditional methods, like applying large amounts of lime, can be costly and may even accelerate soil degradation over time. This necessitates the exploration of more sustainable and effective amelioration strategies.

The researchers investigated the effects of various soil amendments, both individually and in combination, on corn growth and the properties of acid sulfate soil. They tested rice husk ashAsh is the non-combustible inorganic residue that remains after organic matter, like wood or biomass, is completely burned. It consists mainly of minerals and is different from biochar, which is produced through incomplete combustion.   Ash Ash is the residue that remains after the complete More, rice husk biochar, water hyacinth compost, dolomite, and commercial humate, along with several integrated mixtures. The study revealed that integrated soil amendments led to substantial improvements across the board.

One of the most striking findings was the significant increase in soil pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More and available phosphorus. All soil amendments tested increased soil pH, with the highest increase observed when 100% dolomite was applied. However, the real game-changer was the integrated approach. The combination of 30% rice husk biochar, 30% water hyacinth compost, and 40% dolomite (referred to as BCD) proved to be the most effective, boosting available phosphorus. This BCD treatment also effectively reduced exchangeable aluminum concentrations marking a 42% reduction. Furthermore, integrating rice husk biochar and compost significantly reduced the need for agricultural lime by 60%.

Beyond soil properties, these amendments had a direct and positive impact on corn growth. The application of soil amendments significantly increased corn growth by 163%. The BCD amendment, in particular, was highlighted for its ability to enhance corn growth and leaves’ phosphorus level. The study observed notable improvements in plant height, root dry weight, and shoot dry weight across various treatments, with integrated solutions often outperforming single amendments. For instance, the BCD treatment increased phosphorus levels in corn plants by 56% compared to the control.

The success of these integrated amendments lies in the synergistic effects of their components. Biochar improves soil properties like water-holding capacity and cation exchange capacity, which facilitates better nutrient uptake and increases the availability of phosphorus and nitrogen. Compost, rich in humic substances, plays a vital role in improving soil quality, promoting plant growth, and enhancing nutrient availability. The combination addresses multiple deficiencies of acid sulfate soils simultaneously, leading to more robust and sustainable improvements.

This research provides a clear pathway for managing degraded acid sulfate soils more effectively. By integrating readily available local resources like rice husk biochar and water hyacinth compost with dolomite, farmers can significantly improve soil quality, reduce the reliance on costly traditional liming, and ultimately achieve higher crop yields. This approach not only boosts agricultural productivity but also contributes to environmental sustainability by utilizing agricultural waste and promoting healthier soil ecosystems.

Source: Maharani, P.H., Maftu’ah, E., Sulaeman, Y., Napisah, K., Masganti, M., Mukhlis, M., Anwar, K., Ningsih, R.D., & Chairuman, N. (2025). Integrated rice husk biochar and compost to improve acid sulfate soil properties and corn growth. Journal of Degraded and Mining Lands Management, 12(4), 8097-8106.