How Do I Bring Down the Nitrogen Level in Deep Water Hydroponics
Plants are showing signs of excess nitrogen. . . dark green, curling down of the tips. Is there any way to reduce the amount of nitrogen in the water without affecting the other nutrients? All of the nutrient formulas I see include nitrogen.
The following article should help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/understanding-nitrogen-requirements-for-plants.htm
Also, using a fertilizer with an analysis low in nitrogen should help.