Onions are a good candidate for using such a system because they are a relatively long season crop requiring multiple applications of fertilizer. Nutrient Content of Common Fertilizers Material Percentage N P 2 O 5 K 2 O Ca Mg S Approx. Zinc sulfate - ZnSO 4. Triploid watermelon production requires special production techniques. Two of the most important include using transplants and the need for a pollenizer.
Transplant production is required because of the low germination rates with triploid seed.
Even under optimum conditions, germination can be poor. These low germination rates are at least partially due to the thicker seedcoat found in triploid seed. This heavy seedcoat also tends to adhere to the emerging seedling. This can delay development and cause damage to the emerging seedling. Because triploids are sterile there is a need for a pollenizer.