A split operation runs organic and conventional production on the same farm at the same time — some fields certified, some not; some product organic, some a near-identical version of it that is not. It is an ordinary way to farm, and it carries a burden a wholly organic operation does not: proving, continuously, that the two streams never actually became one.
The two streams are often the same crop grown two different ways — the same variety of corn, one field certified and one not — which makes the risk harder to see than it would be with visibly different products. A bin of organic soybeans and a bin of conventional soybeans look identical once mixed; the only thing that could have told them apart was the record showing which bin held which, made before the two ever had a chance to meet.
That burden falls entirely on records, because the risk it manages — commingling — leaves no physical trace once it happens. Everything a split operation does to keep its status intact comes down to documenting separation before the fact, since nothing can demonstrate it afterward.
Your certifier is the authority. What separation a split operation must maintain, how shared equipment may be used, and what documentation satisfies your standard are set by your certifier and your jurisdiction’s regulator, and they differ and change. This page describes the general shape of split-operation recordkeeping, not a specific rule. Confirm your actual obligations with your certifier.
Commingling can't be disproven after it happens
The reason split-operation recordkeeping is so exacting is that its central risk is undetectable once it occurs. A test on a finished crop generally cannot tell you whether it spent time in a bin that also held a conventional lot last week. There is no forensic path back to the moment two streams touched — which means the only defence is never letting the question arise, and the only proof that it never arose is a record showing the streams stayed apart the whole time.
This is the same logic that runs through organic certification recordkeeping generally — a claim about a period needs continuous evidence, not a test at the end — pushed to its sharpest form, because here the thing being proven is an absence rather than a presence.
Separation has to be documented at every point of contact
A split operation keeps its two streams distinguishable everywhere they could plausibly meet: separate storage areas, distinct lot codes applied consistently from harvest through sale, and field records that never leave doubt about which parcel a given crop came from. None of this is exotic — it is the ordinary discipline of good field and input recordkeeping — but it has to be applied with no exceptions, because a single unlabelled bin or an ambiguous field record is the one gap commingling needs.
Consistency matters more than elaborateness here. A simple coding convention followed without exception — every organic lot carries a prefix no conventional lot ever uses, every organic bin carries a fixed, dedicated tag — beats a more sophisticated system that depends on someone remembering to apply it correctly under pressure at harvest. The goal is a separation scheme simple enough that maintaining it never competes with the speed of the actual work.
Shared equipment is the point most operations miss
Storage and lot codes are the visible half of separation. The half that catches operations out is equipment used on both sides — a seeder, a combine, a grain auger, a wash line — because the equipment itself has no organic status, and it carries residue from whatever it touched last onto whatever it touches next. Many standards allow shared equipment provided it is cleaned between organic and conventional use, but “provided it is cleaned” is exactly the clause a record has to satisfy, not the physical act alone.
The record that does this work is a cleaning log: what was run before, what cleaning was performed, and what was run after, in sequence, with dates. Without it, a certifier has no way to know that the sequence you describe is the sequence that happened, and “we always clean between uses” is an assertion, not a record.
The cleaning log is worth keeping even on days it seems unnecessary, such as when the equipment happens to run organic material both before and after a conventional pass with nothing in between. The log’s job is to make the sequence legible without anyone having to remember it, and an occasional gap in a log that is otherwise complete raises more questions than a log that simply notes every pass, clean or not.
Personnel and scheduling are part of the separation, not just storage
A split operation’s risk does not live only in bins and lot codes — it lives in the order people do things in. Handling the organic side first and the conventional side second, on a fixed schedule that never varies by convenience, is a practical control worth documenting alongside the physical separation, because a worker who handles conventional grain in the morning and organic grain in the afternoon without cleaning in between has recreated the exact risk the equipment log exists to prevent, even with perfectly clean bins. A simple note of the day’s handling order is cheap insurance against a habit quietly drifting the wrong way.
A split field record has to survive being read alone
The test of a split operation’s field records is whether a single record, pulled at random and read with no other context, still identifies unambiguously which parcel it belongs to and that parcel’s current organic status. If a field record could plausibly belong to either the organic or the conventional side depending on which folder it was filed in, the record has already failed, because the folder is not part of the record.
Farms partway through converting some ground to organic status face this same demand with an added time dimension, covered separately in organic transition recordkeeping: a transitioning field is neither fully organic nor fully conventional, and its records have to be legible as exactly that, continuously, until the transition resolves.
Where this sits in the rest of the farm's records
Split-operation recordkeeping is not a separate system bolted onto ordinary farm records — it is ordinary field, input, and sales recordkeeping held to a stricter standard of never leaving a stream unidentified. In Farm40, every field, planting, and harvest lot is tied to a specific parcel, so a split operation’s organic and conventional ground stay distinguishable by structure rather than by discipline alone. Its limit: Farm40 has no concept of “organic status” as a field property and cannot flag a commingling risk on its own — it records what field and what lot you attach an entry to, and keeping those attachments accurate, especially around shared equipment, is still work only you can do.