A controlled-environment trial conducted by Wageningen University and Research has provided new data on the impact of microbial amendments in hydroponic systems. The study, commissioned by VGrid Energy Systems, evaluated how Persist® Plant and Soil Enhancer (PAF) influences microbial populations in 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 used as a growing medium for hydroponic tomato cultivation.

Over a 23-week period, researchers compared several growing media, including coir slabs, untreated biochar, acetic acid-treated biochar, and biochar pre-treated with PAF. The analysis used quantitative PCR and DNA metabarcoding to assess microbial communities in both the substrate and the rhizosphere.

Key findings indicated that PAF-treated biochar resulted in a tenfold increase in beneficial bacterial abundance relative to the other treatments. Specifically, bacterial phyla such as Nitrospirae and Firmicutes—associated with nutrient cycling and plant stress tolerance—were more prevalent in the PAF treatment group. This shift was correlated with the highest observed tomato yields across all conditions tested.

Notably, the performance of PAF-treated biochar exceeded that of the acetic acid-treated biochar, suggesting that microbial enhancement was driven by more than 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 adjustment alone. The study points to the importance of targeted microbial stimulation in hydroponic systems, particularly when using alternative substrates like biochar.

While the commercial implications for PAF are clear, the broader relevance of the study lies in its contribution to understanding the microbiological dynamics of biochar in soilless agriculture—a growing area of interest in sustainable crop production strategies.

Press Release: University Trial Confirms Persist® PAF Enhances Plant-Beneficial Microbes