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Nutrient monitoring of pepper transplants

Peppers grown for transplant require very low levels of fertilization at <100 ppm N. Lower fertilization rates are desirable to limit stretch and maintain compact growth. However, inducing nutrient stress with excessively low nutrition can delay production and limit yield potential. Optimal substrate pH values range from 5.8 to 6.2. Peppers are susceptible to both low and high substrate pH disorders. High pH inhibits iron (Fe) uptake, leading to symptoms of interveinal chlorosis (yellowing) on the upper leaves. Low pH causes toxic accumulation of Fe and manganese in the lower leaves, leading to black spotting.

Read the e-GRO factsheet to find out more.