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Reload this Page What soil pH should I aim for?
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Old 11-07-2009, 12:43 AM
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Quote:
Originally Posted by Roland View Post
Plants grow better with good soil pH .. soil pH can be adjusted with Sulphur compounds .. MJ likes 6.5 - 6.8 ... just like tomatoes .... Tomatoes grown in 6.5 soil have a MUCH better flavor than tomatoes grown in soil that is 8 or higher ... sure u still get tomatoes .. but the health robustness flavor in 6.5 soil is BETTER !
Nobody in NorCal Ph's any water at all in any soil grow. Arguably the weed capital of the world.
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Old 11-07-2009, 07:51 AM
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Thanks for all the great replies guys! I'm wondering now if since I'm growing in a soiless mix, do I need to keep my pH in the 5.5-6.2 range? Or since its not a true hydro I need to shoot for the soil pH of 6.2 - 6.8?
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Old 11-07-2009, 08:55 AM
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Nobody in NorCal Ph's any water at all in any soil grow. Arguably the weed capital of the world.
OP is not growing in soil, so your point is meaningless.

I thought soilless grows were supposed to be PH'd at hydro levels-5.5-5.8?
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Old 11-07-2009, 09:47 AM
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I keep my Rock Wool in the low 6's to high 8's. I remember reading he's growing in soil...no need for internet wars...went back and looked. He's not.

But I still stand by not Phing drinkable tap.

Edit, meant to say high 5's.
Last edited by DubsFan; 11-07-2009 at 02:14 PM..
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Old 11-07-2009, 01:41 PM
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Where I live ... the water company goes to great lengths to keep Municipal water supply at 7.0 ... rain water is usually pretty close to 7.0 .. unless you are in areas prone to Acid rain which is generally about the same as tomato juice ... 6.5 to 6.8
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Old 11-07-2009, 07:10 PM
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Hydro and Soil less Mediums
Nitrogen gets locked out of Hydro, Soil less mediums at the levels of 4.5-5.0.
Nitrogen has the best absorption rate at a ph of 5.5 to 8.0
(Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range to have Nitrogen is: 5.0-7.0. Anything out of that range will contribute to a nitrogen def.
 Phosphorus gets locked out of Hydro and Soil less Mediums at ph levels of 6.0-8.5.
Phosphorus is absorbed best in Hydro and Soil less Mediums at ph levels of 4.0- 5.8. (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Phosphorus Deficiency.
 Potassium gets locked out of Hydro and Soil less Mediums at ph levels of 4.0-4.5, 6.0-6.5.
Potassium is absorbed best in Hydro and Soil less Mediums at ph levels of 4.7-5.3, 6.7-8.5. (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a potassium deficiency.
 Magnesium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-5.7
Magnesium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.8-9.1
(Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Magnesium deficiency.
 Calcium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0- 5.3
Calcium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.4-5.8 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Calcium Deficiency.
 Zinc gets locked out of Hydro and Soil less Mediums at ph levels of 5.7-8.5
Zinc is absorbed best in Hydro and Soil less Mediums at ph levels of 4.0-5.5 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Zinc Deficiency.
 Iron gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-3.5
Iron is absorbed best in Hydro and Soil less Mediums at ph levels of 4.0- 6.0 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to an iron deficiency.
 Sulfur gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-5.5
Sulfur is absorbed best in Hydro and Soil less Mediums at ph levels of 6.0- 9.5 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to an Sulfur deficiency.
 Manganese gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-4.5
Manganese is absorbed best in Hydro and Soil less Mediums at ph levels of 5.0-5.6 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a manganese deficiency.
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Last edited by lonleysmoka; 11-07-2009 at 07:13 PM..
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Old 11-08-2009, 07:35 AM
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so basically I should be shooting for the 5.5-6.2 range that hydro users aim for since i'm growing in a soiless mix. Just to remind everyone my medium is B'cuzz HydromixxHP (70% spahgahm peat moss, 30% perlite & dolomite lime)
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Old 11-08-2009, 11:49 PM
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Yup. You're good to go.
 
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