Summary
This large-scale farmer-led field trial evaluated the soil health response to a calcium sulphate dihydrate-based biological conditioner applied as a seed treatment across 3000 km in Brazilian soybean fields over three years. Although most soil chemical, physical, and biological indicators showed site- and year-specific responses that were statistically undetectable, the study identified potential subtle improvements in soil organic carbon, extracellular β-glucosidase activity, and soil bulk density after two to three years of repeated application. The findings suggest the need for extended monitoring to clarify long-term effects of biological conditioners on soil health.
Regional applicability
This study was conducted under Brazilian climatic and soil conditions, which differ substantially from United Kingdom farming contexts in temperature, rainfall, soil type, and cropping systems. Direct transferability to UK arable production is limited; however, the methodological approach using the SMAF-SHI framework and long-term farmer-led monitoring may inform future soil health assessment studies in UK temperate systems, particularly for evaluating biological soil amendments at commercial scale.
Key measures
Soil organic carbon, extracellular β-glucosidase enzyme activity, soil bulk density, soil pH, available phosphorus, exchangeable potassium, soil microbiological activity, soil health index (SMAF-SHI)
Outcomes reported
The study measured soil health indicators including soil organic carbon, extracellular β-glucosidase enzyme activity, soil bulk density, soil pH, available phosphorus, and exchangeable potassium, integrated into a soil health index (SMAF-SHI) across treated and untreated soybean plots. Effects were evaluated over three consecutive years of biological conditioner application (2021–2023) across 87 sampling points from 15 farmer-led experiments.
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