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Kratky Nutrient help
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Nesty
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July 2, 2014 - 8:59 pm
Member Since: July 2, 2014
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Dear All,

I have just started with hydroponics and got interested with the kratky method using lettuce as the specimen. From where I am, there are no premix powdered nutrients. In other cities I see advertisement selling masterblend. However, it is very expensive so I ended up making my own with the help of hydrobuddy. My first attempt now I felt a bit disappointed. I used the recipe by Douglas Peckenpaugh - NO3- 190ppm, P 25ppm, K 98ppm, Mg 25ppm, Ca 216ppm, S 33ppm, Fe 4.9, Zn 0.25, B 0.7, Mn 1.97, Cu 0.07, Mo 005. EC of my tap water is 200uS or 0.2ms/cm. Overall my PH is 6.0 and EC 2.0. The chemicals I use for macro are as follows. Monopotassium Phosphate, KNO3, CaNO3, and Magnesium Sulfate. And my hydroponic growing medium is cocopeat. The peatmoss Klassmann Deilmann tray grown lettuce are far more bigger than my hydroponic kratky set-up. I need from GG and the experts here on their opinion so I can correct my mistake. As of the meantime, I am thinking that the recipe of Douglas is not suited for tropical areas. I thought the K is undervalue. Any suggestions please.

Regards,
Nesty

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geekgardener
Bangalore, India
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July 6, 2014 - 10:33 pm
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Hi,

I have used DouglasPeckenpaugh nutrient before and had no issues with it. From my experiments, I prefer a higher K than what is mentioned (98). You can decrease N to somewhere between 150-170 and increase K to 200. How are the plants doing, are they showing any deficiency? Can you post some pics?

GG

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Nesty
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July 7, 2014 - 9:19 am
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geekgardener said

Hi,
I have used DouglasPeckenpaugh nutrient before and had no issues with it. From my experiments, I prefer a higher K than what is mentioned (98). You can decrease N to somewhere between 150-170 and increase K to 200. How are the plants doing, are they showing any deficiency? Can you post some pics?
GG

Hello GG,

I want to attach a picture of my petchay also in kratky but I dont know how there is no attachment button. Sorry, because I discarded my lettuces. These petchays initially used douglas formula with low K and were not doing well and I replaced the solution using leftover Resh Tomato nutrient with high K. It seems lively and strong with the high K. I will reformulate as per your advise adjusting the N and K of douglas formula. I have a few questions if you dont mind as these were my observations while I was mixing the chemicals.

1. I am using hydrobuddy and I have two parts A(major macro) B(calcium nitrate) I individually dissolve them separately using hot distilled water. They are completely dissolved I can see because I used clear container bottle. However, when I mix them in my nutrient tank in this case I sampled using 1 liter water as my final nutrient then added 10ml of each Part A and B. Mixed vigorously, I see no precipitation but after I leave it overnight in the morning I noticed a thin cloud at the bottom of the 1 liter beaker. Is this normal? I have experience it? I just stir it again but when I used it in my kratky there is this precipation.

2. In hydrobuddy it predicts the EC of the solution. Using douglas peckenpaugh the hydrobuddy predicts an EC of 1.4. But when I measure my final nutrient it reads an EC of 2.4. And since I am growing green and I want to set my EC at 1.4 the only way I can get that is to flush some nutrient and add more water. My chemical in the macro are MKP, MgSO4, KNO3, and CaNO3. I am concern that adding water to lower EC to 1.4 will also lower the ppm of each elements of the macros and I will not satisfy it. But at 2.4 I think it will satisfy because this is actual full strength. I am confused please enlighten me on this one.
I hope to hear from you soon.
Many thanks

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geekgardener
Bangalore, India
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July 30, 2014 - 8:33 pm
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Nesty,

sorry for my delayed reply. 1 & 2 are a result of your base water. Can you tell me what is the EC of the water you are using. If the predicted EC and actual EC are so far from each other, something is going wrong with the starting EC. Just check the EC of the water and share it here

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