You probably assumed that organic apple orchards had healthier, more biodiverse soil than conventional ones. A new study in South Australia suggests you might want to reconsider that assumption.
Researchers compared soil samples from eight orchards—four certified organic for seven years or more, four conventional—expecting to find clear differences in microbial diversity and abundance. Instead, they found the soils were remarkably similar. The types of microbes differed slightly (organic plots had more dung saprotrophs, fungi that feed on decaying matter), but when it came to overall diversity and abundance, the two systems looked almost identical.
The real surprise came when researchers compared both farmed soils to native, unfarmed soil from the surrounding area. Native soils actually had lower microbial and fungal biodiversity than either farming method. This flipped the researchers' expectations entirely—the organic orchards were more similar to conventional ones than to the "natural" baseline.
We're a new kind of news feed.
Regular news is designed to drain you. We're a non-profit built to restore you. Every story we publish is scored for impact, progress, and hope.
Start Your News DetoxWhat's really going on
The researchers think the answer lies in history. All eight orchards had been farmed conventionally at some point. That legacy appears to linger in the soil even after years of organic management. More tellingly, farmers across both organic and conventional sites were using overlapping techniques: mulching, green manuring (growing legumes and plowing them back in to add nitrogen), and other shared practices. The binary divide between "organic" and "conventional" is blurrier than the labels suggest.
This doesn't mean organic farming is pointless—it just means the organic label alone doesn't guarantee soil health. A conventional farm using green manuring and careful soil management might be doing more for microbial life than an organic operation relying on the certification alone.
The study is small (eight orchards in one region, one crop type), so it's not a verdict on all organic agriculture. But it does suggest we're asking the wrong question. Instead of assuming organic automatically wins on ecology, we might focus on specific practices—whether they're used on organic or conventional land—that actually rebuild soil life. That's harder than reading a label, but it's closer to the truth.
