Here the plants leave excess nutrient behind. This imbalance causes PPM to increase, effectively decreasing pH, causing nutrient lockout. Possible causes are high heat/intense light which will increase the plant's transpiration of water as the plants "sweat".
Diagnosis of these problems is important. Once you get into a routine with a particular crop and growing environment, you will develop a knack for what should and should not be, making this seemingly complex process simple. Keep a log and LEARN!
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