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Nutrient monitoring of tomato transplants

Tomato transplants require low levels of fertilization, growing optimally with 100 to 150 ppm N continuously to maximize growth. Lower fertilization rates of 50 to 75 ppm N are often used to manage growth because few plant growth regulator options are available. This requires careful management of nutrients to avoid nutritionally stressing the plants and diminishing the yield potential of the transplants. Optimal substrate pH values are between 5.8 and 6.2. Tomatoes are susceptible to both low and high pH disorders, developing iron (Fe) and manganese (Mn) toxicity at low pH and Fe deficiency at high pH.

Read the e-GRO factsheet for more information.