Yellow onion

When evaluating yellow onions, prioritize firmness and skin integrity. The bulbs should be hard to the touch with multiple layers of papery, golden-brown outer scales that are intact. Avoid onions showing signs of sprouting (green necks), soft spots, or black mold (Aspergillus niger) at the neck or base. For B2B processing, specify the dry matter content, as higher levels are essential for dehydration or frying applications.

Yellow onions are typically graded by diameter. Common international standards include Small (30-50mm), Medium (50-70mm), and Large/Jumbo (70-100mm+ ). Ensure your supplier adheres to UN/ECE Standard FFV-25 or local equivalents like USDA Grade No. 1. Clearly define the allowable tolerance for undersized or oversized bulbs (usually 5-10%) in your purchase agreement to ensure consistency for retail or industrial use.

To mitigate biological and chemical risks, suppliers must provide GlobalG.A.P. certification, which ensures good agricultural practices. For entry into major markets, a Phytosanitary Certificate issued by the exporting country's national plant protection organization is mandatory to prove the shipment is free from pests like the onion fly or stem nematode. Additionally, request MRL (Maximum Residue Limit) test reports to ensure pesticide levels comply with the destination country's food safety laws (e.g., FDA or EFSA regulations).

Yellow onions require a controlled atmosphere to maintain dormancy. The ideal shipping temperature is between 0°C to 2°C (32°F - 36°F) with a relative humidity of 65% to 70%. High humidity leads to root growth and decay, while low humidity causes excessive weight loss. Ensure the use of reefer containers with active ventilation (set at approximately 15-25 m³/h) to remove metabolic heat and CO2, preventing the buildup of moisture that triggers rot.

Agricultural commodities like onions are subject to seasonal price swings. To secure stable pricing, consider Forward Contracts or Volume-Based Pricing Agreements with established suppliers on Made-in-China.com. It is also wise to diversify sourcing regions to account for potential crop failures due to weather events in specific geographical areas.

For new suppliers, utilize Letter of Credit (L/C) or Escrow-based payment terms to ensure funds are only released upon proof of shipment. Always mandate a Pre-shipment Inspection (PSI) by a third party like SGS or Bureau Veritas. The inspection should focus on weight verification, moisture content, and the absence of internal breakdown, as these issues are difficult to dispute once the container is opened at the destination.

For bulk shipments, leno mesh bags (25kg or 50kg) are the industry standard as they allow for maximum airflow. For premium or retail-ready markets, wooden crates or ventilated cardboard bins provide better physical protection against crushing. Ensure all packaging materials are fumigated and carry the ISPM 15 mark to avoid customs delays related to wood packaging regulations.

Given the perishable nature of onions, shipping delays can result in total cargo loss. Ensure your Incoterms (e.g., CIF or CIP) clearly define when risk transfers. It is highly recommended to purchase Marine Cargo Insurance that specifically includes a 'Reefer Breakdown Clause' and coverage for inherent vice or delay, providing financial protection if the cooling system fails during transit.