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Nitrogen Deficiency in Plants

Notes on Nitrogen Deficiency in Plants:

Nitrogen is a macronutrient.

Older leaves will yellow, especially at the bottom of the plant. Stems might be yellow and spindly. Growth is slower and foliage might be light green.
More fish! Urea.
In an established system with fish that match your grow area, this should not be a problem. Fish waste is turned into ammonia, which turns into nitrites, then nitrates. A brand new system doesn’t have the nitrifying bacteria built up yet, but after 6-10 weeks water with urea/ammonia in it will naturally form the bacteria needed to create nitrates.
Nitrogens are toxic to fish in higher levels. Your test kit will tell you how many PPM you currently have, and each fish can tolerate different levels.
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