White leaves, its not powdery mildew

[The70’s]

Any idea what would cause white leaves

 

[Roy Growin]

Trace minerals, I'd try some kelp

 

[Wastei]

Any idea what would cause white leaves

Looks like Sulfur deficiency to me? What is she planted in? Sulfur starts to drop out of solution below pH 5.5 in soil. It's not that big of a problem early on.

It's very common with a combination of Ca, Mg and Sulfur def since they all drop out of solution at lower pH values. Depending on the soil mix sulfur might be the one to fall out first.

Peat has a natural pH of 3.5-4.5 while coco coir about 5.5. Both needs to be amended and buffered with extra Ca and Mg in the mix to keep pH in range. Many soil mixes already come pre-buffered and amended but if you re-use soil from previous grows you're better of re-amending and buffering with things like lime and gypsum or by letting the medium sit in Ca/Mg solution for 12+ hours to let the medium re-buffer.

The last approach takes shortest time but also need more Ca/Mg in the nutrient mix. With slow release Ca/Mg like Lime and Gypsum you're better of adding and letting the soil "cook" for a couple of weeks to let the lime, often dolomite lime break down before use. If you don't let it break down fully before use you end up with a negative Ca:Mg ratio and plants will suffer as a result.

Use both sparingly and at the lowest possible concentration. You use them in terms of keeping pH in check, not adding Ca/Mg back to the plants. At least that what you're doing when running a complete plant food in readily available form from mineral salts, the ratios (Ca:Mg) are already calculated in the base formula and are often better kept alone.

Hope that makes sense.

Cheers!

 

[The70’s]

Looks like Sulfur deficiency to me? What is she planted in? Sulfur starts to drop out of solution below pH 5.5 in soil. It's not that big of a problem early on.

It's very common with a combination of Ca, Mg and Sulfur def since they all drop out of solution at lower pH values. Depending on the soil mix sulfur might be the one to fall out first.

Peat has a natural pH of 3.5-4.5 while coco coir about 5.5. Both needs to be amended and buffered with extra Ca and Mg in the mix to keep pH in range. Many soil mixes already come pre-buffered and amended but if you re-use soil from previous grows you're better of re-amending and buffering with things like lime and gypsum or by letting the medium sit in Ca/Mg solution for 12+ hours to let the medium re-buffer.

The last approach takes shortest time but also need more Ca/Mg in the nutrient mix. With slow release Ca/Mg like Lime and Gypsum you're better of adding and letting the soil "cook" for a couple of weeks to let the lime, often dolomite lime break down before use. If you don't let it break down fully before use you end up with a negative Ca:Mg ratio and plants will suffer as a result.

Use both sparingly and at the lowest possible concentration. You use them in terms of keeping pH in check, not adding Ca/Mg back to the plants. At least that what you're doing when running a complete plant food in readily available form from mineral salts, the ratios (Ca:Mg) are already calculated in the base formula and are often better kept alone.

Hope that makes sense.

Cheers!

Lets see, Coast of Maine living soil Stonington blend. I add worm castings, perlite, and GaiaGreen 444 (3tbs per gallon soil).

 

[The70’s]

This is what happens when you add twice the amount of fertilizer, um ya kill ur plants…

New plan, no fertilizer for seedlings and much smaller first pots, things are going real well for the new grow, just soil worm castings and some perlite. I water once every three or four days.