In article <24uu0q$rlu at nova.np.ac.sg>
fwl at nova.np.ac.sg (Forday Wayne Lee) writes:
> I know I may sound a bit ignorant here (I'm not a plantologist), but
>> 1. Are algae plants ?
> 2. Can plants (like vegetables and trees) take up ammonia or
> are they restricted to taking up nitrates ?
> 3. If they can take up ammonia do they prefer ammonia or
> nitrates ?
Yes, algae are plants. Most plants take up both ammonium and nitrate.
I don't know about preferences in all plants, but coniferous trees seem
to "prefer" ammonium, perhaps because it is energetically less costly
to convert into a form usable by plants. A good place to find more
information is: Salisbury and Ross. Plant Physiology. Wadsworth,
Richard.L.Boyce at dartmouth.edu