here are some pictures of good, bad and the worse from some of the experiments gathered in several years, i will continue to upload more pictures in my free time, there are tons of pictures to share:
as you can see there are several good and several bad pictures of the plants, the purpose of the experiment was to observe plant health under different ratio, PPM, Chemicals, including varieties of light spectrums, Necrosis and chlorosis on plants were also observed under several conditions. these set of picture were not designed to impress you by only posting a good one and not sharing the bad one, it was designed for you to see how plant respond under different conditions.
algae also responded to several different ratio, fertilizer and such. in some cases algae grew equally well along with the plants when condition were setup wrong on purpose, especially the fertilizer.
root tabs were also put to the test, while root tabs benefited some plant simply by leaching into the water, it also caused several type of algae issues and negative impact on plant health. root tabs are not needed, it was observed that aquatic plant should grow quite well even free floating as well as in inert substrate, under this condition plant seems to grow well when NH4/Urea is the major source of Nitrogen and other nutrients were present in the water. once NO3 was the only source of the Nitrogen, plant would struggle unless there is a NH4 leaching from somewhere, from fish or soil.
Urea, when Urea was added to the water, some plant from the soil will appear that were never there before or previously removed completely. it could be seeds that seems to be triggered by the addition of urea. i observed several plant would only appear when urea was added and they would stop appearing once urea was replaced by NO3 as a nitrogen source. it was also observed, under NH4/Urea dosing very little Calcium was needed and there were no calcium deficiency under even 1 ppm Calcium weekly.
several plant are very sensitive to cold water, i observed that some plant would melt away if you added cold water to drop the temp from 78 to 60, under this condition Rotala Sunset for example dropped its leaves and slowly melted away.
another observation was made where plant started to show more issue was when the balance shifted from NH4 to NO3 or simply say when NO3 became more dominated source of N, under such condition twisting became quite evident and rich color faded away. keeping the NO3 low seems to be more beneficial and let the plant use much of the NH4 coming from your tank naturally or by adding small doses of NH4 daily. if No3 is high, adding some addition of Nh4/Urea will reduce the issue mentioned above.
i used the following recipes in most cases with great results
Micro #2 or #6, 0.1 ppm Fe weekly
Macro # 3 or #4, 1-2 ppm N weekly, 0.4-0.8 ppm Mg weekly
there are several other observation which i will share in my free time