1.seedling tray is mainly square and round, square hole holes generally contain about 30% more matrix than round hole holes, water distribution is more uniform, seedling root development is more full. The size of the standard hole tray is 540mm×280mm, because of the different hole diameter size, the number of holes between 18-800, 20 holes black seedling tray is cheap, widely used, so it is very popular in various countries, such as the United States, Canada and other countries.
2. The color of the seedling tray affects the temperature of the plant roots. The white polystyrene foam plate is better reflective, and is mostly used for early seedling breeding in summer and autumn to facilitate the reflection of light and reduce the accumulation of heat in the roots of young seedlings. The choice of black seedling tray in winter and spring, because of its good light absorption, is beneficial to the green root of young seedlings. After the seedlings grow up, they should start to use the root control rapid seedling technology, move into the root control rapid seedling container, and continue to grow.
3. The materials used for making cavity trays are generally polystyrene foam, polystyrene, polyvinyl chloride and polypropylene. There are blow molding and injection molding methods. General vegetable and ornamental plant nursery pot is made of polystyrene material.
