Lima, et al (2024) Revitalizing fertility of global soils: Meta-analysis on benefits of poultry litter 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 on soil health. Brazilian Journal of Agricultural and Environmental Engineering. http://dx.doi.org/10.1590/1807-1929/agriambi.v28n12e278204

A recent study conducted a meta-analysis to evaluate the benefits of poultry litter biochar (PLB) on soil health. The analysis reviewed systematic data from various global studies to understand how PLB affects soil chemical properties and overall soil quality. The results indicated significant positive changes in key soil attributes, such as 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, cation exchange capacity (CEC), and the levels of nutrients like nitrogen, carbon, potassium, calcium, and magnesium.

The study found that PLB reduced soil aluminum content by 71% while increasing pH, nitrogen, carbon, and CEC by 16%, 20%, 36%, and 82%, respectively. This increase in CEC was attributed to the addition of essential cations like calcium, magnesium, and potassium, which increased by 43%, 202%, and 636%, respectively. The dual function of PLB was highlighted: it corrects soil acidity and pH while enhancing the content of vital nutrients.

Poultry litter, rich in nitrogen, phosphorus, and potassium, traditionally poses environmental risks when directly applied to soil, such as eutrophication. However, when converted to biochar, it provides a safer and more effective means of improving soil health and fertility. The research showed that PLB significantly enhances soil pH, reduces aluminum toxicity, and increases nutrient availability, making it a viable biofertilizer for agricultural use.

The study underscores the potential of reusing poultry litter in biochar production to improve soil health and crop productivity, offering valuable data for developing sustainable agricultural practices.