The Planted Tank Forum - View Single Post - Ultilmate fertilizer for faster plant growth
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Old 06-12-2012, 04:47 PM   #6
Seattle_Aquarist
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Hi Happi,

Plants absorb their nitrogen first from nitrates, secondly from ammonicial nitrogen sources, and finally from urea. I know that urea is inexpensive but why use a source of nitrogen that plants cannot uptake efficiently?
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