Greetings to the members of this prestigious forum. I apologize for my English....I am Brazilian. Please, I have a question about pH variation in the nutrient solution stored in the pots of my semi hydroponic system and this exclusively in my cattleyas. No matter what the initial pH of my nutrient solution is...it invariably drops to 3.5 after a few hours. I've experimented adjusting the initial ph from 5.5 to 7.0...and the result is always the same. I use a version of the k-lite formula that I made myself based on the package information, because we don't have this product readily available in Brazil. I'm a chemist, so I don't have many difficulties in making the nutrient, but of course studying all the wonderful information on the First Rays website, which I highly prestige. I use the following raw materials to compose the formulation: calcium nitrate, magnesium nitrate, monoammonium phosphate, potassium nitrate, and a commercial formula of micro elements such as molybdenum, boron, zinc and chelated metals such as iron, manganese, copper and nickel. I'm currently testing the addition of a little magnesium sulfate, decreasing of course the magnesium nitrate. When using rainwater I need to increase the pH with potassium or calcium hydroxide. When I use water from the municipal supply, I need to lower the pH with phosphoric acid, remembering that tap water in the region where I live has a low TDS, around 30, so I'm thinking of eliminating rainwater, because of the work it takes. in collecting it. The interesting thing is that in phalaenopsis, the opposite occurs... the solution tends to become alkaline, but at a very slow pace, which in my point of view, does not generate any problem. Watering is done with 25 ppmN nutrient solution every two or three days, filling and emptying the pots, thus maintaining the solution level in the drain holes. Well folks, I fear that the roots of the cattleyas may be suffering from this pH of 3.5 or, in the worst case, some of the nutrients are not being absorbed by them. The bulbs are growing slowly without any apparent problems, but I haven't gotten flower stems yet. Please, any comments on this topic? Thanks in advance.
---------- Post added at 10:22 AM ---------- Previous post was at 10:09 AM ----------
Quote:
Originally Posted by Georg Luiz Barth
Greetings to the members of this prestigious forum. I apologize for my English....I am Brazilian. Please, I have a question about pH variation in the nutrient solution stored in the pots of my semi hydroponic system and this exclusively in my cattleyas. No matter what the initial pH of my nutrient solution is...it invariably drops to 3.5 after a few hours. I've experimented adjusting the initial ph from 5.5 to 7.0...and the result is always the same. I use a version of the k-lite formula that I made myself based on the package information, because we don't have this product readily available in Brazil. I'm a chemist, so I don't have many difficulties in making the nutrient, but of course studying all the wonderful information on the First Rays website, which I highly prestige. I use the following raw materials to compose the formulation: calcium nitrate, magnesium nitrate, monoammonium phosphate, potassium nitrate, and a commercial formula of micro elements such as molybdenum, boron, zinc and chelated metals such as iron, manganese, copper and nickel. I'm currently testing the addition of a little magnesium sulfate, decreasing of course the magnesium nitrate. When using rainwater I need to increase the pH with potassium or calcium hydroxide. When I use water from the municipal supply, I need to lower the pH with phosphoric acid, remembering that tap water in the region where I live has a low TDS, around 30, so I'm thinking of eliminating rainwater, because of the work it takes. in collecting it. The interesting thing is that in phalaenopsis, the opposite occurs... the solution tends to become alkaline, but at a very slow pace, which in my point of view, does not generate any problem. Watering is done with 25 ppmN nutrient solution every two or three days, filling and emptying the pots, thus maintaining the solution level in the drain holes. Well folks, I fear that the roots of the cattleyas may be suffering from this pH of 3.5 or, in the worst case, some of the nutrients are not being absorbed by them. The bulbs are growing slowly without any apparent problems, but I haven't gotten flower stems yet. Please, any comments on this topic? Thanks in advance.
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I wrote it in English, but I'm not sure if the message sent was automatically translated into Portuguese by my cell phone. If this happened I apologize. Can anyone tell me if this topic is actually written in English?
---------- Post added at 10:41 AM ---------- Previous post was at 10:22 AM ----------
I noticed that there is an exclusive forum for topics related to semi hydroponics. I ask the forum moderator to feel free to transfer this matter to the appropriate forum, if necessary. Sorry for the misunderstanding.
Ph problems in nutritive solution stored in semi hidroponic pots
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