Key Factors That Affect the Transportation of Fresh Produce

Every year, enormous quantities of fresh fruits and vegetables are lost before they ever reach consumers. According to the Food and Agriculture Organization of the United Nations, approximately $400 billion is lost annually between harvest and the retail market – a significant portion of which occurs during transportation. Fresh produce doesn’t stop living after harvest; it continues to respire, ripen, and respond to its environment. That means every decision made during transit – from how a crate is stacked to what temperature is maintained in the vehicle – directly determines what arrives on the consumer’s plate. Understanding the key factors that affect the transportation of fresh produce is essential for reducing these losses and delivering quality food from farm to market.

Handling practices: the first line of defense 🔗

How produce is handled from the moment it’s loaded onto a vehicle has a direct impact on its condition at delivery. According to the FAO, while the shape and condition of trucks matter, the loading and stowing methods in vehicles are most directly tied to damage and loss. The goal is to achieve the best loading factor – the maximum load that can be carried economically under satisfactory technical conditions – while maintaining a stable and well-ventilated arrangement.

Improper loading causes two major types of physical damage: compression damage, which occurs when the weight of the load is supported by the produce itself rather than the container, and impact and vibration damage, caused by rough roads, vehicle speed, and poor packaging. Research published in ScienceDirect confirms that mechanical damage from vibration is one of the most common quality challenges during transit, and that in some developing countries, transportation alone accounts for over 20% losses in tomatoes and other fresh produce.

To minimize these risks, packages must be strong enough to support the stacked weight above them, sized to allow adequate ventilation, and loaded on dunnage or pallets to allow air circulation around the stack. PostHarvest Technologies also notes that packages should be loaded in reverse order to their unloading sequence – last on, first off – with even weight distribution across the vehicle. Driving standards matter too; aggressive driving adds vibration stress that packaging alone cannot fully offset.

Temperature management: the most critical factor 🔗

Of all the factors in transit, temperature has the greatest influence on produce quality. PostHarvest Technologies states clearly that produce temperature is the single most important factor affecting the quality of horticultural produce. Fresh fruits and vegetables remain alive through respiration – a process that consumes carbohydrates and oxygen and produces carbon dioxide, water, and heat. Higher temperatures accelerate this process, hastening ripening, decay, and nutritional loss.

NC State Extension explains that harvested items which may remain in good condition for only a few hours at field temperatures can be kept for days when promptly cooled to their optimum storage temperature. Cooling slows respiration, reduces water loss, inhibits the growth of decay-producing microorganisms, and reduces ethylene production – all of which extend shelf life and preserve quality.

The cold chain 🔗

Maintaining temperature across every stage of the journey – from pre-cooling at the farm, through refrigerated transport, to temperature-controlled storage at the destination – is known as the cold chain. A comprehensive review in ScienceDirect highlights that any break in this chain renders the entire cold chain effort useless. Problems in any single link – whether a refrigeration unit failure, a delay at customs, or an unloading dock with no shade – increases food loss and waste while negating all prior investment in temperature control.

Different types of produce require different temperature zones. Cool-season crops such as lettuce, broccoli, and carrots are best held near 0-2°C, while warm-season vegetables like tomatoes and peppers require temperatures around 10-13°C to avoid chilling injury. Tropical fruits like bananas and mangoes are particularly vulnerable to cold damage and must not be exposed to temperatures below their threshold. Research on citrus transport found that targeted cold chain conditions are not always maintained in commercial shipments, and that even short temperature deviations can significantly increase food waste.

For air transport, the challenges are especially acute. PostHarvest Technologies notes that cargo areas on aircraft are not refrigerated, and produce can sit in ambient conditions – varying from hot to freezing – during loading, transit, and customs clearance at the destination. Policies and handling processes must be designed to minimize this exposure time.

Humidity control: preventing wilting and decay 🔗

Relative humidity (RH) is closely linked to temperature and plays its own important role in produce quality during transit. PostHarvest Technologies specifies that a 90-95% RH environment is required for the maximum shelf life of most fruits and vegetables. When humidity drops below this range, produce loses water through transpiration, leading to wilting, shrivelling, and reduced marketability. On the other hand, excessively high humidity promotes bacterial and fungal growth, accelerating decay – particularly in meat and certain vegetables.

A study tracking 95 commercial shipments found that for every 10% increase in relative humidity around unpacked fruit during transport, mass loss was reduced by 20% across all studied fruits – a striking figure that demonstrates how much humidity management matters economically. A few commodities such as bulb onions, garlic, winter squashes, and ginger are exceptions, requiring storage below 70% RH to prevent decay from excess moisture.

Refrigerated highway trailers typically lack RH control. To compensate, produce susceptible to wilting should be waxed or packaged in liners, bags, or plastic containers to slow moisture loss. Packaging material choice also matters: fibreboard and wooden boxes can absorb moisture from produce, causing weight loss and weakening the structural integrity of the boxes themselves, which creates compression risks in stacked loads.

Air circulation and ventilation 🔗

Adequate airflow within a loaded vehicle serves multiple functions. It removes heat generated by produce respiration, equalizes temperature across the load, and removes gases such as carbon dioxide and ethylene that build up in confined spaces. The FAO recommends that for long-distance vehicles, air intakes be fitted with louvres to ensure positive airflow throughout the load, and that a white-painted radiation shield above the main roof can reflect solar heat and help keep produce cool.

Poor ventilation design in packaging compounds the problem. If crates or cartons are packed too tightly with no aligned vent holes, cold air cannot circulate through the load, creating warm pockets where produce deteriorates faster. PostHarvest Technologies states that the size and design of packages should give adequate levels of ventilation with the minimum of wasted space, and packages must be strong enough to bear the weight of stacked loads without collapsing and blocking airflow.

Ethylene management during transit 🔗

Ethylene is a naturally produced plant hormone that triggers and accelerates ripening. During transport, its uncontrolled accumulation inside a vehicle or container can cause serious quality losses. Felix Instruments reports that approximately 15-20% of postharvest fresh produce losses are attributed to senescence triggered by ethylene, which can cause premature softening, browning, off-flavors, yellowing of green vegetables, and decay.

The danger is especially high when ethylene-producing commodities – such as apples, bananas, tomatoes, and mangoes – are transported in the same vehicle as ethylene-sensitive commodities – such as lettuce, broccoli, cucumbers, and carrots. eOrganic at Cornell advises that green leafy vegetables should never be transported in containers holding ripening fruits such as apples, pears, or bananas. Even low concentrations of ethylene, in the parts per billion range, can visibly affect sensitive produce within a short transit time.

Ventilation is the most practical on-road solution. Damage in refrigerated containers can be reduced using a fresh air exchange rate of at least 0.2 L s⁻¹, or by using ethylene scrubbers – devices that chemically absorb or oxidize ethylene before it accumulates to harmful levels. Holding produce at the lowest safe temperature also reduces ethylene production and slows its effects.

Compatibility of mixed loads 🔗

Many commercial shipments involve mixed loads – different types of produce, and sometimes other refrigerated goods like dairy and meat, sharing the same vehicle. Each commodity has its own ideal temperature, humidity, and ethylene tolerance. Logmore notes that managing mixed loads is one of the most complex challenges in fresh produce logistics, and that produce spends about half of its shelf life in the shipping process.

The general principle for mixed loads is to group produce with the closest possible temperature and humidity ranges, and to keep ethylene producers separated from sensitive commodities. For short trips of less than 8 hours, the risk of incompatibility is lower. For longer journeys, solutions include multi-compartment trucks with removable partition panels, mini-containers at pallet scale, and controlled atmosphere (CA) technology that can allow otherwise incompatible commodities to travel together under managed gas conditions.

Maturity and condition of produce at loading 🔗

The condition of produce before it enters the vehicle matters as much as what happens during transit. Produce intended for long-distance shipping must be harvested at the right maturity stage – typically slightly under-ripe – and must be free of mechanical damage and disease. Produce showing damage or advanced ripeness at the point of loading is already compromised and will deteriorate faster regardless of how well conditions are controlled in transit. Locally sold produce, with a short transport window, can tolerate a more mature harvest stage because there is less time to manage.

Additionally, Cornell University’s GAP program emphasizes that vehicle cleanliness is a factor that is often overlooked. Prior loads carrying contaminated cargo can introduce pathogens to fresh produce. A transportation management plan should document prior cargo, require functioning refrigeration units, and include a pre-loading checklist covering both temperature and cleanliness standards.

Mode of transport and transit duration 🔗

The choice of transport mode – road, rail, sea, or air – determines the overall time in transit, the level of temperature control available, and the degree of handling the produce will undergo. Air transport is the most expensive but essential for highly perishable produce that cannot survive long transit windows. Rail is suited for medium-distance bulk shipments with insulated and ice-cooled cars. Sea transport, while the most economical, is only practical for produce with a long shelf life or where controlled atmosphere containers are available.

Regardless of mode, transit duration is directly tied to quality loss. Every additional hour in transit consumes shelf life. Efficient route planning, pre-arranged customs documentation, and coordination between harvest timing and dispatch schedules all help minimize unnecessary delays. As PostHarvest Technologies recommends, investing in fleet management technology with real-time temperature and GPS monitoring allows supply chain managers to detect deviations and intervene before damage compounds – turning reactive loss control into proactive quality management.

What do you think? Given that temperature breaks and poor handling are among the leading causes of postharvest losses, where do you think the most practical improvements can be made in small-scale or developing-country supply chains? And as a consumer, how much do you think transit conditions should factor into food labelling and traceability standards?

References

1. https://www.tive.com/blog/produce-transportation-101-a-temperature-humidity-guide-for-fruits-vegetables
2. https://www.fao.org/4/t0073e/t0073e05.htm
3. https://www.sciencedirect.com/science/article/abs/pii/S0924224422001480
4. https://www.postharvest.com/transport-and-distribution/reducing-food-loss-during-transport
5. https://www.postharvest.com/transport-and-distribution/factors-affecting-produce-quality-during-transport
6. https://content.ces.ncsu.edu/introduction-to-the-postharvest-engineering-for-fresh-fruits-and-vegetables/2-produce-cooling-basics
7. https://www.sciencedirect.com/science/article/abs/pii/S0924224421000728
8. https://www.sciencedirect.com/science/article/abs/pii/S0956713525006073
9. https://www.sciencedirect.com/science/article/pii/S0260877422001315
10. https://felixinstruments.com/blog/what-is-ethylene-gas-and-how-does-it-affect-fruit-shelf-life/
11. https://eorganic.org/node/2671
12. https://www.logmore.com/post/the-challenges-of-fresh-produce-logistics
13. https://cals.cornell.edu/national-good-agricultural-practices-program/resources/educational-materials/decision-trees/transportation
14. https://www.postharvest.com/blog/9-best-cold-chain-practices-you-should-be-doing-now