What types of seedling nutrient pots are there for watermelon seedling raising?

(Agricultural Wealth Network) 1. Paper pots; 2. Plastic pots, pressed from polyvinyl chloride or polyethylene, with a diameter of 8 to 10 cm and a height of 10 cm, with holes in the bottom; 3. Machine-made soil pots: first add an appropriate amount of water to the nutrient soil so that the soil can be squeezed into a ball that does not break when dropped, then use a handheld pot-making device with a diameter of about 6 cm to press the nutrient soil one by one into soil pots, arrange them neatly in the seedbed or dry them in the sun for later use. 4. Nutrient soil blocks, which can be made from matured soil or river pond mud.