How to Prepare Farm Produce for Export: Quality, Storage and Handling

A buyer may agree to purchase Nigerian agricultural produce because of its price, availability or product specifications, but the transaction can still fail if the commodity arrives with excessive moisture, mould, contamination, physical damage, inconsistent grading, pest infestation or poor packaging.

Export quality is not created at the port. It starts in the field and is protected through every stage between harvesting and shipment. Preparing farm produce for export therefore involves much more than harvesting and putting the commodity into bags. The exporter needs to control how the crop is harvested, cleaned, sorted, dried where necessary, stored, transported and documented.

The exact process depends on the commodity. Fresh vegetables require different handling from sesame seed, cocoa beans, cashew nuts, ginger, maize or dried beans. However, the principle is the same: preserve the quality achieved during production and prevent avoidable deterioration after harvest.

Begin With the Buyer’s Specification

Before harvesting a crop for export, understand what the buyer expects.

Export buyers may specify requirements relating to grade, size, colour, moisture, foreign matter, defects, packaging, quantity, cleanliness and other quality characteristics. The requirements can also vary according to the destination and intended use of the commodity.

This means an exporter should not simply prepare produce according to what is acceptable in the local market.

A commodity can be perfectly saleable locally and still fail an exporter’s buyer specification.

The first step is therefore to obtain the buyer’s product specification and determine how it will be measured. If the buyer requires a particular moisture level, for example, the exporter needs a reliable way to measure moisture rather than estimating it by appearance or touch.

NEPC identifies quality assurance as an important part of export procedures and notes that the relevant certificates depend on the product and destination. Agricultural commodities may require a phytosanitary certificate from Nigeria Agricultural Quarantine Service, while other products may require different documentation.

Harvest at the Right Stage

Harvesting is the first major post-harvest quality-control point.

The correct harvest stage depends on the crop and its intended market. Harvesting too early can result in immature produce with poor quality or inadequate development. Harvesting too late can increase exposure to weather, pests, diseases, cracking, shattering or other forms of damage.

For fresh fruits and vegetables, maturity is particularly important because the produce continues to change after harvest. The exporter needs to consider the time between harvesting and consumption, the expected transport conditions and the requirements of the destination market.

FAO notes that harvesting methods and timing can significantly affect post-harvest quality. Mechanical injury such as bruising, cuts and abrasions can accelerate deterioration and increase susceptibility to decay, while careful and timely handling helps maintain quality.

Harvesting should therefore be planned around both crop maturity and the post-harvest journey.

Handle Produce Carefully During Harvest

A product can be damaged before it ever reaches the storage facility.

Throwing produce into containers, overfilling bags, dropping sacks, dragging produce across rough surfaces or using dirty harvesting equipment can create damage and contamination.

For fresh produce, bruising and cuts may not always be obvious immediately. However, damaged tissue can deteriorate more quickly during storage and transportation.

FAO identifies careful harvesting, expedited handling and reducing unnecessary handling steps as important measures for maintaining horticultural quality.

The same principle applies to grains, nuts, seeds and other commodities. Excessive mechanical damage can reduce quality and create additional problems during storage and processing.

Keep Harvested Produce Away From Contamination

Once the crop has been harvested, it should be protected from sources of contamination.

Produce placed directly on dirty ground can pick up soil, stones, animal waste, insects and other contaminants. Containers used for harvesting and temporary storage should be clean and suitable for the commodity.

Dry products should also be protected from rain and moisture during harvesting and handling.

For fresh produce, water used during cleaning or handling must also be appropriate for the intended use and managed hygienically.

The goal is to prevent a situation in which a clean, marketable crop becomes contaminated through poor handling after harvest.

Sort Before Storage or Shipment

Sorting removes produce that does not belong in the export lot.

The process may involve removing damaged, diseased, mouldy, immature, overripe, discoloured or otherwise unsuitable produce. For grains and seeds, sorting may also remove stones, stalks, chaff, insects and other foreign materials.

Sorting is not simply about appearance. It protects the quality of the entire consignment.

A small amount of damaged material can create problems if it introduces moisture, mould, insects or contamination into an otherwise good batch.

FAO describes removal of unmarketable material, sorting by maturity or size, grading and packaging as fundamental preparation operations for fresh fruits and vegetables.

Grade the Produce Consistently

Sorting and grading are related but not identical.

Sorting removes unsuitable material, while grading separates acceptable produce according to defined characteristics such as size, weight, colour, maturity, quality or other specifications.

For export, consistency matters.

An importer who orders a particular grade expects the shipment to conform to the agreed specification rather than containing a mixture of different qualities.

The grading system should therefore be based on measurable criteria wherever possible. Workers should also be trained to apply the same standards throughout the lot.

This is especially important when produce is collected from several farms or suppliers. Without consistent grading, one export consignment can contain substantial variation in quality.

Dry Products Properly

Drying is one of the most important steps for many agricultural commodities, particularly grains, legumes, seeds and other products that need moisture control before storage.

Excess moisture can encourage mould, insect activity, heating and other forms of deterioration. FAO explains that grain needs to be dried after harvest to a moisture level appropriate for safe storage and that drying conditions can affect grain quality.

The important point is that drying should not be treated as simply leaving produce under the sun until it feels dry.

The objective is to achieve sufficiently uniform moisture content without damaging the commodity.

Use Clean and Suitable Drying Surfaces

Traditional sun drying can be useful, particularly for suitable commodities and small or medium quantities, but the method needs to be managed properly.

Drying produce directly on bare soil can introduce dirt and contamination. Rain can also interrupt drying and re-wet the crop.

FAO recommends using surfaces that prevent contact with ground moisture and notes that produce should be protected from contamination during drying.

Where practical, raised platforms, clean drying floors, tarpaulins or other suitable surfaces can help maintain cleanliness.

The produce should also be spread in a way that allows air movement and should be turned or managed as necessary to promote uniform drying.

Do Not Overheat the Commodity

More heat does not always mean better drying.

Excessive drying temperatures can damage certain commodities. FAO notes that inappropriate drying conditions can contribute to problems such as grain cracking and breakage, while excessive temperatures can adversely affect grain quality.

For this reason, the appropriate drying method depends on the commodity.

Mechanical dryers can provide greater control than uncontrolled exposure to heat, but they still need to be operated according to the characteristics of the product.

An exporter should not use a single drying temperature or method for every agricultural commodity.

Measure Moisture Instead of Guessing

Moisture is one of the areas where measurement is much safer than visual judgment.

A product may appear dry on the outside while retaining moisture internally. Unevenly dried batches can also contain pockets of higher moisture that create storage problems later.

FAO identifies moisture content as a critical factor in grain storage and explains that high moisture encourages problems involving fungi, insects, respiration and deterioration.

For commodities where moisture specifications are part of the buyer’s requirements, use a suitable moisture meter or appropriate laboratory testing method.

The target moisture level should be based on the particular commodity, the intended storage period, the storage conditions and the buyer’s specification. There is no single moisture percentage that is appropriate for every agricultural product.

Store Produce Only After It Is Ready

Storage should preserve quality, not rescue badly prepared produce.

Putting wet, damaged or contaminated produce into storage can allow problems to spread.

Before storage, the facility should be clean, dry and suitable for the commodity. Existing stocks should be inspected, and obvious sources of infestation or contamination should be addressed.

FAO’s guidance on grain storage stresses the importance of cleaning storage structures, checking for infestation and removing infested material before storage.

The storage environment also needs to be managed according to the commodity. Moisture, temperature, ventilation, pests and hygiene can all affect the condition of stored produce.

Keep Produce Off the Floor

Farm produce should not be stored in a way that allows it to absorb moisture from the ground or come into unnecessary contact with contaminants.

Bags, cartons and other packages should be positioned appropriately and the storage area should allow inspection, cleaning and movement.

For bagged commodities, proper stacking also helps reduce unnecessary pressure and makes it easier to identify damaged or infested packages.

Storage should be organised so that older and newer lots can be identified rather than being mixed without records.

Control Pests and Mould

Insects and mould can rapidly reduce the quality of stored agricultural products.

The risk increases when produce enters storage with excessive moisture or when storage conditions allow moisture to accumulate.

FAO identifies moisture content, relative humidity and temperature as important factors affecting deterioration during grain storage.

The response should not simply be to apply chemicals after a problem appears.

Good storage management begins with clean produce, proper drying, hygienic storage, suitable packaging, monitoring and appropriate pest-control measures.

Where a chemical treatment or fumigation is necessary, exporters should use only legally permitted products and procedures appropriate for the commodity and destination. Export documentation requirements can include fumigation certification for applicable agricultural commodities.

Protect Fresh Produce From Heat

Fresh fruits and vegetables require a different approach from dry commodities.

After harvest, fresh produce continues to lose water and undergo physiological changes. High temperatures can accelerate deterioration.

For produce travelling long distances, cooling and temperature management can become important components of the post-harvest system.

FAO notes that the level of post-harvest technology required depends on the distance and time between harvest and consumption, the intended use of the produce and the target market. For long-distance fresh-produce distribution, pre-cooling, refrigeration and suitable packaging may become necessary.

This is why exporters of fresh produce need to consider logistics before harvesting rather than after the product has already been packed.

Use Suitable Packaging

Packaging is part of quality control.

The package needs to protect the product from physical damage, contamination and, where appropriate, moisture and temperature problems.

The correct packaging depends on the commodity. A package designed for dried seeds may not be suitable for fresh vegetables, while a package that works for domestic transportation may not provide adequate protection during an international shipment.

FAO notes that packaging can protect horticultural produce from mechanical injury and contamination and that packaging design can influence airflow, temperature and relative humidity around the commodity.

Packaging should therefore be selected based on the product, transport method, expected handling and buyer requirements.

Keep Different Lots Identifiable

Traceability becomes important when agricultural products move through several stages before reaching the international buyer.

A useful traceability system should allow the exporter to identify where a particular lot came from and what happened to it after harvesting.

For example, an exporter sourcing sesame from several farmers should be able to distinguish different supplier lots and maintain records of when they were received, inspected, cleaned, dried, stored and combined.

This becomes especially valuable when a quality problem is discovered. Without traceability, the exporter may have difficulty determining which farm, storage location or processing stage contributed to the problem.

Keep Basic Production and Handling Records

Traceability does not necessarily require an expensive computer system.

For a small agricultural business, properly maintained records can provide a useful starting point.

Record the farm or supplier, harvest date, commodity, quantity, lot identification, quality inspection, drying information where relevant, storage location, treatment or fumigation where applicable, packaging details and shipment information.

As the business grows, these records can be moved into digital systems.

The important thing is consistency. A traceability system only works when information is recorded accurately throughout the supply chain.

Reduce Unnecessary Handling

Every additional handling stage creates another opportunity for damage or contamination.

Moving produce repeatedly from the field to a temporary pile, then to another location, then back to the processing area and finally into storage increases labour requirements and creates additional handling risks.

FAO notes that reducing the number of handling steps can help minimise post-harvest losses in horticultural produce.

A well-organised operation should therefore consider the movement of the commodity from harvest through sorting, processing, storage and loading.

Good layout can reduce both damage and cost.

Inspect the Product Before Shipment

The final inspection should take place before the produce leaves the storage or packing facility.

The exporter should confirm that the lot still matches the agreed specification.

Depending on the commodity, this may involve checking moisture, cleanliness, grading, packaging, quantity, visible defects and other relevant quality characteristics.

If laboratory testing or official certification is required, those requirements should be completed before shipment according to the applicable procedures.

NEPC emphasises the importance of using reliable and verified quality competent authorities because they support compliance with international standards and market access.

Prepare the Export Documents

Good physical preparation must be supported by correct documentation.

The documents required depend on the commodity, destination and nature of the transaction. NEPC identifies quality assurance documents, commercial documents, financial documents and goods-movement documents among the areas exporters need to prepare.

For agricultural commodities, a phytosanitary certificate may be required. Processed or semi-processed food products can have different certification requirements.

The exporter should therefore establish the applicable documentation before shipment rather than assuming that one set of documents applies to every farm product.

Prevent Post-Harvest Losses Before They Happen

Post-harvest loss prevention is more effective when it is built into the process.

Harvesting at the appropriate maturity, handling produce carefully, sorting damaged material, drying commodities correctly, maintaining suitable storage conditions and using appropriate packaging all work together.

Trying to correct a severely damaged or mouldy commodity at the end of the process is much harder than preventing the damage in the first place.

FAO describes post-harvest management as a chain extending from harvesting through handling, storage and marketing, with quality and safety affected by decisions made at each stage.

For exporters, this means post-harvest management should be treated as part of production rather than as an activity that begins after production has finished.

Common Mistakes That Reduce Export Quality

One of the most common mistakes is harvesting without considering the buyer’s specification. Another is allowing harvested produce to remain exposed to rain, excessive heat, animals or contamination before processing.

For dry commodities, insufficient or uneven drying can create serious storage problems. For fresh produce, excessive handling and poor temperature management can accelerate deterioration.

Mixing different quality levels is another problem. A clean, high-quality lot can be compromised when inferior produce is added simply to increase the shipment quantity.

Poor record keeping can also become costly. When an exporter cannot identify where a problem originated, it becomes more difficult to correct the problem or respond to a buyer’s quality complaint.

Build an Export-Ready Post-Harvest System

A farmer preparing small quantities for an occasional buyer may operate differently from an exporter supplying containers regularly.

However, the basic quality principles remain the same.

The system should connect harvesting, sorting, drying or cooling, storage, packaging, traceability, inspection and shipment preparation.

NEPC’s export guide treats export readiness, market understanding, export planning, documentation, logistics and pricing as connected parts of the export process.

This is important because product preparation cannot be separated completely from the market.

If a buyer requires a specific grade or packaging format, that requirement needs to influence how the product is handled from the beginning.

A Practical Export Preparation Flow

The overall process can be thought of as:

Harvest correctly → Protect the produce → Sort and grade → Dry or cool as required → Inspect quality → Store properly → Maintain traceability → Package appropriately → Complete required certification → Conduct final inspection → Prepare for shipment.

The exact steps will change according to the commodity.

A bag of dried sesame, a cocoa bean consignment and a shipment of fresh vegetables should not be handled in exactly the same way. What matters is that the method protects the characteristics the buyer has agreed to purchase.

Final Thoughts

Preparing farm produce for export begins long before the container is loaded.

The quality of an agricultural export depends on decisions made during harvesting, sorting, drying, storage, packaging and transportation. Poor handling at any one of these stages can reduce the value of an otherwise good crop.

For Nigerian farmers and exporters, the practical objective should be to build a post-harvest system around the actual requirements of the product and its destination market.

Dry commodities need careful moisture management and suitable storage. Fresh produce may require rapid handling, cooling and appropriate packaging. All products benefit from clean handling, consistent grading, traceability and final quality inspection.

The best time to plan these controls is before harvest begins.

Frequently Asked Questions

How do I prepare farm produce for export?

Start by understanding the buyer’s product specification and then plan harvesting, sorting, grading, drying or cooling, storage, packaging, traceability and final inspection around those requirements. The exact process depends on the commodity and destination.

Why is harvesting important for export quality?

Harvesting determines the condition in which the product enters the post-harvest system. Harvesting at the appropriate maturity and avoiding bruising, cuts and other damage can help preserve quality during storage and transportation.

How should agricultural products be dried before export?

Drying requirements depend on the commodity. For grains and other moisture-sensitive products, drying should reduce moisture to a level suitable for storage without causing heat damage or excessive cracking. Moisture should be measured rather than estimated by appearance alone.

How can I reduce post-harvest losses before exporting?

Reduce losses by harvesting at the right stage, handling produce carefully, removing damaged material, drying or cooling appropriately, maintaining clean storage, controlling pests and moisture, using suitable packaging and reducing unnecessary handling.

Why is traceability important for agricultural exports?

Traceability allows an exporter to identify where a product or lot came from and what happened to it during handling, storage and processing. It can make quality investigations easier and help the exporter respond more effectively to buyer complaints or quality problems.

What documents may be required when exporting agricultural products from Nigeria?

Requirements depend on the commodity and destination. NEPC identifies documents such as phytosanitary certificates for applicable agricultural commodities, health certificates for applicable processed or semi-processed food products, and other quality, commercial and shipment documents.

How should farm produce be stored before export?

Storage should be clean, dry and suitable for the specific commodity. Produce should enter storage in an appropriate condition, with moisture controlled where relevant and protection against pests, contamination and excessive humidity.

What is the most important part of preparing farm produce for export?

There is no single step that applies to every commodity. The key is maintaining quality throughout the entire post-harvest chain, from harvesting through sorting, drying or cooling, storage, packaging and shipment. Each stage should be matched to the product and buyer’s requirements.