How to manage the 3 Ms of poinsettias: manganese, molybdenum and magnesium
from Greenhouse Grower
The pH of soilless media plays a large role in the availability of nutrients to plants. Most micronutrients tend to be more available to plants at low media pH. For crops inefficient at uptake of micronutrients, pH above 6.0 may result in micronutrient deficiencies. For crops efficient at micronutrient uptake, such as geraniums, pH below 5.8 can cause micronutrient toxicities.
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