Hello,
it's since when i bought them that i noticed a very slow growth of my plants in the pond, in particular the floating ones. They became yellow and small, something weird for some invasive plants. I'm trying to fix the problem, due i thought it was luck of phosphorus, with a fertilizer of potassium phosphite with leaf application. After i diluited it (2ml on a litter of water), i used more or less 50ml of the new solution, following more or less the instruction on the bottle. But i think that fertilizer is specific for normal plants more than aquatic ones.
About the plants, the pistias stratiotes don't grow, they have a diameter of around 4 cm; the azolla caroliniana completely disappeared; the salvinia natas grow but it's not very green and flourishing; the same for the limnobium laevigatum. The other plants (mentha aquatica, caltha palustris, iris and pontederia cordata) grow pretty well even if i took off the ground from their vases to replace it with rocks, to make them get more nutriments from the water and make the water more transparent, but it is still green. The fishes don't go to eat the roots of the plants because some of them are in places not reachable for them.
Today i used the water test to have some values:
NO3- 0
NO2- 0
GH 8°d
KH between 6 and 10°d
pH 8.0
Cl 0
(some values could be not totaly right, due i used a test with the color comparition)
I ask help to anyone who have ideas to make my plants grow, thanks
Sorry for my bad english, i am not a native speaker so maybe i made mistakes
Here some pics of the pond:
it's since when i bought them that i noticed a very slow growth of my plants in the pond, in particular the floating ones. They became yellow and small, something weird for some invasive plants. I'm trying to fix the problem, due i thought it was luck of phosphorus, with a fertilizer of potassium phosphite with leaf application. After i diluited it (2ml on a litter of water), i used more or less 50ml of the new solution, following more or less the instruction on the bottle. But i think that fertilizer is specific for normal plants more than aquatic ones.
About the plants, the pistias stratiotes don't grow, they have a diameter of around 4 cm; the azolla caroliniana completely disappeared; the salvinia natas grow but it's not very green and flourishing; the same for the limnobium laevigatum. The other plants (mentha aquatica, caltha palustris, iris and pontederia cordata) grow pretty well even if i took off the ground from their vases to replace it with rocks, to make them get more nutriments from the water and make the water more transparent, but it is still green. The fishes don't go to eat the roots of the plants because some of them are in places not reachable for them.
Today i used the water test to have some values:
NO3- 0
NO2- 0
GH 8°d
KH between 6 and 10°d
pH 8.0
Cl 0
(some values could be not totaly right, due i used a test with the color comparition)
I ask help to anyone who have ideas to make my plants grow, thanks
Sorry for my bad english, i am not a native speaker so maybe i made mistakes
Here some pics of the pond: