Cell trays have become an essential tool in the industrial seedling production process. Whether for flowers or vegetables, the use of cell trays in seedling propagation represents a fundamental revolution in modern horticulture, ensuring quick and large-scale production. The materials commonly used to make cell trays include polystyrene, polystyrene foam, polyvinyl chloride, and polypropylene. The manufacturing methods include blow molding and injection molding. Generally, cell trays for vegetable and ornamental plant seedlings are made from polystyrene material.

The hole shapes in seedling trays primarily include square and round. The square holes typically contain about 30% more substrate than the round ones, resulting in more even water distribution and more robust root development of the seedlings. Standard seedling trays are 540mm x 280mm in size, with the number of holes ranging from 18 to 800, depending on the diameter of the holes. For cultivating medium and small seedlings, trays with 72-288 holes are recommended.

The color of seedling trays can affect the temperature of plant roots. White polystyrene foam trays have good reflectivity and are commonly used for early seedling in summer and autumn to reflect light and reduce heat accumulation at the seedlings' root tips. In winter and spring, black seedling trays are preferred due to their good light absorption, which is beneficial for the greening of seedling roots. As the seedlings grow, the controlled root rapid seedling technique should be initiated, transferring them into controlled root rapid seedling containers to continue growth.

Here is all the knowledge you need to understand the importance of seedling tray specifications, hoping it helps everyone.