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=== Nutrient lockout===
[[File:SoilpHNutrientLockout.png|thumb|400x400px|The availability of nutrients in soil at different pH]]
Nutrient lockout occurs when the pH is too high or too low for the plant to properly absorb nutrients. This leads to a deficit of necessary nutrients for growth and/or survival. A nutrient lockout can also occur when the grow medium accumulates too much salt or other nutrients.
[[Watering#pH|More on ideal pH]]
== Pre-mixing nutrients ==
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