On the forums acquariofacile I found a list of rich and substantial symptoms of nutritional deficiencies of aquatic plants .

To quote as it seems because I do not need to be edited. :-)


Nitrogen
- Chlorosis (yellowing leaves) in the older leaves first and then the young ones.
- Fall of the leaves (chlorosis after)
- Sagging leaves significantly
- Loss of color in the leaves from the old ones.
- Stems very slender

Phosphorus
- Developing labored
- Loss of older leaves
- Reddish pigment
- Chlorosis along the leaf veins (first in younger leaves)
- Loss of old leaves
- Loss of lucidity leaf
- Colours marked and / or bronze tints
- Redness along the ribs

Potassium
- Weakening of the stem
- Patchy chlorosis and necrotic margins following
- Blackened leaf areas
- Yellowing of the edges marked in the older leaves
- Browning
- Necrosis of leaf margins

Magnesium
- Blotchy chlorosis on older leaves first
- Loss of old leaves
- Yellow or purple spots on the leaf blade
- Folding up the leaf margins
- Yellowing of the leaves except the ribs first on older leaves
- Chlorosis magnesian
- Moria degl'apici radical when you can see them

Football
- Chlorosis of young leaves followed by necrosis and Fall
- Deformed leaves
- Opaque color of the leaves
- Leaves yellowish / whitish
- Discoloration and General negl'apici
- Necrosis with extensive rot
- You can not redistribute the element in a crisis, because it is permanently fixed

Iron
- Very obvious chlorosis in young leaves from ribs
- Chlorosis extended over the whole plant
- Veins yellow and / or white in young leaves

Manganese
- Chlorosis in spots and streaks present between the veins of the leaves followed by necrosis
- Ribs of the leaves with soft edges.
- Yellowing with shades
- New leaves with extreme dwarfism due to lack of photosynthesis.
- Reflections on the upper metal

Zinc
- Slow growth
- Chlorosis of older leaves between the veins
- Deformation of the leaf margins
- New apices marked with a yellow changing to white
- Reduction in size dell'apici

Boron
- Young leaves very dark green
- Thickening of the leaves
- Disintegration of the leaf
- Necrotic margins
- Extensions foliar incorrect and / or odd shapes
- Stains from chlorosis
- Deficiencies similar to those of calcium

Sulfur
- More evident chlorosis on young leaves
- Stunted growth
- Small apical leaves
- Unusual curling of leaves

Copper
- Darkening of the youngest leaves
- Leaves twisted and rolled
- Often necrotic margins