Hmmm. Há tanta gente com durezas altas e plantados impecáveis...
Vê este post que tirei do UKAPS. É de um dos membros mais "sábios" do fórum:
niru wrote:...In EI type dosing wherein ferts are practically unlimited for the given light, does having an extra dosing (say of Ca/Mg for already hard water) affect the water osmosis? So
fert
uptake by plants might still be doing ok, but its the water that the plant looses?...
Hi niru,
To corroborate Tom's response I can honestly say that I have not seen any visible effects of excess Ca/Mg on plant growth, and that's starting from GH 3 up to an even beyond 25 GH. There is a lot of chatter on the web about Ca and Mg content. A lot of that chatter involves the Ca:Mg ratios within the water column. That's because in terrestrial plants, the sediment content and ratios have a significant impact on performance. I guess that a lot of the data comes from hydroponics sources or from field studies of terrestrials. People then automatically carry these arguments over to aquatic plants. If there is some magic ratio I haven't seen it because I've dumped boatloads of Ca/Mg into the tank and have not yet detected any significant impact from content or ratios, whether high or low. Now of course, I don't have a scanning electron microscope so I can't say that at the cellular level there aren't some osmoregulatory effects, but if there are, they certainly aren't showing up at the macroscopic level because the growth rates and structural quality at unlimited nutrition are just too amazing. Check this out:
Ludwigia inclinata var. Pantanal is a notoriously difficult plant to grow in high GH water. This plant, along with Tonina sp are about the only ones included in a handful of plants that demand low GH. Just about everywhere, you'll read how GH for L. Pantanal must be no greater than 3-4. I got a hold of a couple of stems and stuck them in my tank with unlimited nutrients and at KH 15+ and GH 25+. By all rights, there should have been no hope, but two weeks after sticking it in the tank, here was L. Pantanal happily pearling away at GH 25+:
Later on, these stems did just fine after adjusting fully to submersed. Now granted, these specimens did not achieve their growth potential under these conditions. They were very slow growing and stunted, but they didn't disintegrate as predicted either, and that's a direct result of unlimited nutrition and good CO2.
Other specimens in the tank under the same high GH and KH conditions and under high nutrient loading. I see no evidence of osmoregulatory issues as a result of the nutrient load. The same can be said whether using unlimited Nitrogen from Nitrate or unlimited Nitrogen from Tobi's Urea/Ammonium. There can be no doubt that even under adverse conditions, unlimited nutrition solves problems for aquatic plants and does not introduce problems. You can be assured that if you visit any website in The Matrix and someone complains that they have this problem or that problem due to excessive this or excessive that, it's a certainty that their real problem is simply that they do not have enough of this or enough of that....
FONTE: http://ukaps.org/for...o2+fert#p170387
Abraço,
GM