New Soil Test Reveals Microbe Role in Plant Phosphorus Cycling

Researchers have developed a simpler, cheaper, and accurate method to measure DNA-bound phosphorus in soil, offering insights into microbial nutrient cycling for sustainable agriculture.

By RTech News Desk 28 September 2026 2 min read

Summary

An international team of researchers, including scientists from Sultan Qaboos University and the James Hutton Institute, has refined a laboratory method to measure DNA-bound phosphorus in soil. Published in the Journal of Agricultural and Marine Sciences, the improved technique is simpler, less expensive, and maintains accuracy. This development, reported on September 27, 2026, could enhance understanding of how soil microbes influence phosphorus availability for plants, particularly in the UK soils studied. The new approach aims to support more sustainable agricultural practices and nutrient management globally.

Key points

New method simplifies measuring DNA-bound phosphorus (DNA-P) in soil.
Technique is now cheaper and easier while preserving accuracy.
DNA-P indicates biologically active phosphorus linked to soil microbes.
Eliminating enzyme treatments made the process more economical.
Ultrafiltration remains crucial for accurate DNA-P separation.
Improved test aids research into sustainable agriculture and nutrient management.

An international team of researchers has streamlined a method for measuring DNA-bound phosphorus in soil, making the technique more accessible and less costly while maintaining its accuracy, according to ScienceDaily. The improved method could offer new insights into how soil microbes recycle phosphorus, potentially supporting more sustainable agricultural practices and nutrient management.

The refined laboratory procedure focuses on DNA-bound phosphorus (DNA-P), a biologically active form of the nutrient. Phosphorus is a critical element for plant growth and food production globally, but natural reserves of the nutrient are finite. Understanding how phosphorus is stored, transformed, and released in soil is essential for maintaining fertile farmland, reducing waste, and mitigating environmental damage, ScienceDaily reported.

Method Refinement and Findings

The research, which included scientists from Sultan Qaboos University, the James Hutton Institute, and the Environment Authority of Oman, was published in the Journal of Agricultural and Marine Sciences, according to ScienceDaily. The team tested and modified an existing analytical procedure, then applied the updated version to 32 different soil types collected from across the United Kingdom.

The primary improvements to the method centered on simplifying the process and reducing costs. Researchers found that certain enzyme treatments, previously considered necessary, could be eliminated without compromising the precision or sensitivity required for reliable measurements. This adjustment made the technique both simpler to perform and more economical, ScienceDaily stated.

However, one step remained crucial for the method's accuracy: ultrafiltration. This process is still required to separate DNA-bound phosphorus from other compounds that also contain phosphorus. Without this separation, measurements of DNA-P would be less accurate, according to ScienceDaily.

DNA-P represents a component of the organic phosphorus pool that is directly associated with living microorganisms. Because microbes constantly take up, transform, and release nutrients within the soil, measuring DNA-P can provide a direct window into the biologically active portion of the soil phosphorus cycle, ScienceDaily reported.

In the soils studied, DNA-P constituted only a small fraction of the total organic phosphorus. Despite its minor share, the concentration of DNA-P showed strong relationships with several important soil properties. These included pH levels, the amount of microbial biomass phosphorus, the organic matter content, and the concentration of phosphorus dissolved in soil water, according to ScienceDaily.

Context and Implications

These observed connections suggest that DNA-P is more closely linked to living soil microorganisms than to long-lasting, stable phosphorus reserves within the soil. This indicates that DNA-P may serve as a useful indicator for the more active part of the phosphorus cycle, which is significantly influenced by microbial life, ScienceDaily reported.

The development of this improved method provides scientists with a more practical tool for studying biologically active phosphorus in soils. It could also enable researchers to further investigate how microbial communities impact the amount of phosphorus that becomes available for plants to absorb, according to ScienceDaily.

As agricultural systems face increasing pressure to utilize finite phosphorus resources more efficiently, better methods for measuring this essential nutrient are becoming increasingly important. The new approach could support future research efforts aimed at improving soil fertility, optimizing nutrient management strategies, and developing more sustainable food production systems, ScienceDaily stated.

Frequently Asked Questions

What is the new soil test designed to measure?

The new soil test is designed to measure DNA-bound phosphorus (DNA-P) in soil. This form of phosphorus is biologically active and linked to living microorganisms, providing insights into the dynamic part of the soil phosphorus cycle.

How does the improved method benefit researchers and agriculture?

The improved method is simpler, cheaper, and maintains accuracy, making it a more practical tool for scientists. It can help researchers understand how microbial communities influence phosphorus availability for plants, supporting more sustainable farming and nutrient management.

What was a key modification made to the existing analytical procedure?

A key modification involved eliminating certain enzyme treatments that were previously considered necessary. Researchers found these treatments were not essential, which simplified the process and reduced costs without compromising measurement precision.

Why is understanding DNA-bound phosphorus important for agriculture?

DNA-bound phosphorus is closely associated with living soil microorganisms and the active part of the phosphorus cycle. Understanding its role can help optimize the use of finite phosphorus resources, improve soil fertility, and lead to more efficient food production systems.