Best Practices for Loading and Unloading Fresh Produce

Fresh fruits and vegetables are living commodities – they continue to respire, lose moisture, and age from the moment they leave the field. Yet, one of the most overlooked windows for quality loss is right at the loading dock and unloading bay. How produce is handled during these two stages directly determines whether it arrives in market-ready condition or reaches the buyer bruised, compressed, and prematurely deteriorated. Getting loading and unloading right is not complicated, but it does require the right containers, the right methods, and trained hands.

Why loading and unloading cause so much damage 🔗

Mechanical damage is one of the most persistent quality threats in the postharvest supply chain. Research published in ScienceDirect confirms that improper loading and unloading by untrained workers leads to mechanical damage, which in turn triggers microbial spoilage and accelerates decay. Bruises, cuts, and compression injuries are not just cosmetic – they break down cell tissue, create entry points for pathogens, and dramatically reduce shelf life.

Physical damage during handling is cumulative. According to the University of Massachusetts Extension, each time produce is moved there is a risk of physical injury, and even damage that is not immediately visible can develop into bruising or disease-promoting lesions later in the supply chain. This is why minimizing the number of times produce is manually handled – and ensuring that every touch is careful – matters so much.

Choosing the right containers 🔗

The container is the first line of defense against physical injury. A container that is too weak, too large, or poorly designed will fail to protect produce regardless of how carefully workers handle it. The FAO’s post-harvest training manual specifies that packages must be strong enough to protect contents, provide adequate ventilation, and waste as little interior space as possible. A container with excess space allows produce to shift and collide during transit, while an overfilled container causes compression injury to the bottom layers.

Rigid crates and plastic containers 🔗

PostHarvest Technologies notes that reusable plastic containers are structurally stronger than corrugated fibreboard boxes and offer better protection against compression damage. Unlike fibreboard, plastic does not absorb moisture and weaken under the high humidity conditions produced by respiring fresh produce. When locally-made containers have sharp edges or rough inner surfaces, a simple cardboard liner can be added to protect delicate items from abrasion during loading and transit.

Corrugated fibreboard boxes 🔗

If corrugated fibreboard boxes are used, they must be designed to retain sufficient strength throughout the entire journey under high-humidity conditions. The corners of these boxes provide most of their structural support, and they should never extend over the edge of a pallet – even a 25 mm overhang can reduce box strength by 14 to 34%. Boxes should also never be stacked beyond the height recommended by the manufacturer, as the bottom layers can collapse under the weight of those above.

Container sizing and standardization 🔗

Standardized container sizes improve handling efficiency and reduce damage during both loading and unloading. The University of Florida IFAS Extension points out that using standard packaging sizes allows growers to readily calculate harvest volumes and communicate them to buyers, and that many buyers require packaging footprints to match standard grocery pallet dimensions (40 x 48 inches). Standardization also means containers can be stacked uniformly, reducing the risk of collapse and making mechanical handling more straightforward.

Safe manual handling techniques 🔗

Not all operations have access to forklifts or conveyor systems, making trained manual handling essential. The core principle is simple: treat produce gently, and limit how many times it changes hands. The New England Vegetable Management Guide recommends that for most crops, smooth and clean-surfaced crates, along with conveyance using elastic and soft belts and rollers, should be used to minimize injury.

Workers should be specifically trained to avoid dropping, throwing, or dragging containers. FAO guidelines flag that sacks dropped or thrown will cause severe damage to their contents, and this applies equally to boxes and crates. Loading and unloading should always be properly supervised to prevent careless handling. Where possible, loading aids – trolleys, roller conveyors, pallet trucks – should be used to reduce the need to individually handle packages.

Protecting produce from sun and rain during transfer 🔗

The window between vehicle and storage is a critical exposure point. PostHarvest Technologies is clear that packed produce must be protected from sun and rain at all times during loading and unloading. Sun exposure during transfer raises produce temperature rapidly, accelerating respiration and deterioration. Even brief heat exposure during loading or unloading can reduce shelf life, making shaded or covered loading areas a practical investment for any operation.

On the vehicle side, field vehicles carrying produce should be parked in shaded areas while awaiting unloading to prevent product warming and sunburn damage.

Load arrangement and stowage 🔗

How a load is arranged inside the vehicle is just as important as how it is handled at the loading point. The FAO recommends placing packages on dunnage – pieces of lumber or slatted racks – or on pallets on the vehicle floor, so air can circulate freely around the stacked load during transport. Restricted airflow traps heat generated by respiring produce, which speeds up deterioration.

When a single vehicle is delivering to multiple destinations, packages should be loaded in reverse order – last on, first off – so that the produce for each stop can be unloaded without disturbing the rest of the load. The load should also be distributed evenly across the vehicle to maintain stability and prevent shifting. A void should always be left between the last stack of produce and the rear doors, with wooden load bars used to brace the load and prevent it from falling against the doors when they are opened at the destination.

Palletization: reducing manual handling and improving uniformity 🔗

Palletization is one of the most effective tools for reducing produce damage during loading and unloading. By grouping multiple packages into a single unit load that can be moved by a forklift or pallet jack, it dramatically reduces the number of individual touches – and every touch is a potential damage event.

PostHarvest Technologies reports that proper palletization, combined with stretch wrap, corner braces, or banding, prevents boxes from sliding during handling and transport. Stacking tabs or palletizing glue can also assist in keeping boxes aligned. When plastic containers with interlocking systems are used, properly stacked pallets stay stable without additional securing materials.

Damage reduction and ventilation benefits 🔗

The physical protection offered by proper palletization is significant. Studies on palletized loads have shown that vibration damage – one of the most common forms of mechanical injury during transit – can be reduced through appropriate packaging and correct placement within the vehicle. Palletized loads also allow for strategic spacing between units, promoting air circulation that removes respiratory heat and slows deterioration.

When palletization is done 🔗

In commercial operations, palletizing is typically carried out after hydrocooling or package-ice cooling but before forced-air cooling. In field-pack operations – where grading, sorting, sizing, and packing happen in the field – palletizing is done on-site before the produce is transported to a central cooling facility. This approach reduces the number of times produce is repacked and rehandled, which is a key advantage for minimizing mechanical damage.

Load planning for palletized produce 🔗

Using the “last in, first out” loading system when palletizing for multi-stop deliveries minimizes unnecessary handling and exposure time at each stop. Securing loads properly prevents shifting during transit, which is a common cause of bruising in palletized fresh produce. Free space at the periphery of a pallet should be avoided, as it allows the load to move and shift during transport.

Worker training and supervision 🔗

Equipment and procedures are only effective if workers understand and follow them. A key finding in postharvest loss research is that mechanical damage during loading and unloading is directly linked to untrained and inexperienced workers. Investment in training – covering correct lifting, stacking, container placement, and equipment use – is one of the lowest-cost, highest-impact steps any operation can take.

Supervision during loading and unloading operations should be consistent, not occasional. The FAO advises that loading and unloading should be properly supervised to prevent careless package handling. Beyond physical technique, workers should understand why careful handling matters: a bruised tomato or a cracked mango is not just a cosmetic issue – it is lost income and shortened shelf life for the entire supply chain.

Minimizing time out of cold storage 🔗

Loading and unloading break the cold chain – even briefly. Penn State Extension notes that a one-hour delay in cooling can reduce the shelf life of produce by a day or more. Well-designed loading operations, where vehicles back up to the correct height so workers can unload directly into the cooler without lifting boxes, are a practical way to minimize warm-air exposure during transfer. Keeping loading and unloading windows short, working efficiently, and pre-planning load arrangement all help maintain cold chain integrity and protect quality from the very first moment produce leaves the vehicle.

What do you think? Given that most post-harvest damage during loading and unloading comes down to worker technique and container quality, which of these two factors do you think is harder to address in a small-scale farming operation – and what would it take to improve it? If you were designing a loading dock for a packhouse handling mixed produce, what single design feature would you prioritize to reduce damage?

References

1. https://www.sciencedirect.com/science/article/pii/S277256692500045X
2. https://nevegetable.org/cultural-practices/postharvest-handling-and-storage
3. https://www.fao.org/4/t0073e/t0073e05.htm
4. https://www.postharvest.com/transport-and-distribution/factors-affecting-produce-quality-during-transport
5. https://edis.ifas.ufl.edu/publication/HS1270
6. https://www.fao.org/4/t0073e/T0073E03.HTM
7. https://www.postharvest.com/transport-and-distribution/reducing-food-loss-during-transport
8. https://www.postharvest.com/blog/a-guide-to-post-harvest-treatment-and-handling-of-fruits-and-vegetables
9. https://www.postharvest.com/postharvests-introductory-class/post-harvest-system-overview
10. https://www.sciencedirect.com/science/article/abs/pii/S0924224422001480
11. https://www.farmstandapp.com/20028/best-practices-for-post-harvest-handling/
12. https://extension.psu.edu/keeping-produce-fresh-best-practices-for-producers