rpo503

I will start my grow in just a few weeks; need a little more clearification.

I wanted to do an entirely organic grow but seem to be lost with a few things. The part im lost on is the P because from what i hear its not ussally water soluble. I know i can buy organic fertilizer that contain N, P, and K that i could mix in the soil. This is confusing because it doesnt release right away. Also im a little confused about flushing soil that contains ferts mixed in. So maybe i might have to go organic during vegg and organic/chemical during flowering.

Is it hard to find water soluble nutrients that contain high amounts of P.

Any one have any advice about the water soluble part?

Thanks

Lizzie Borden

You're right, most organic P is not water soluble and isn't immediately available when mixed into the soil. Fortunately the plants don't need a lot of P until flowering. So if you mix bone meal, rock phosphate, etc. into the soil from the beginning, by the time the plants are flowering the P will be there for them. Bat guano is water soluble, and some of it is high in P. You can make tea out of that if they're not getting enough P from the soil during flowering.

rpo503

I plan to use kelp meal tea and blood meal tea for veg. and my plant will use bone meal when flowered and if i think she needs a little boost ill give her some bat guano high in P.

Will this do the trick?

Thanks a lot!

Lizzie Borden

That sounds like a pretty good plan, but I would add more K. Sul-po-mag mixed into the soil with the bone meal would do it.

rpo503

Sul-po-mag what is the npk ratio for this. Should i use this instead of the kelp meal or with the kelp.

Thank you

Lizzie Borden

Sul-po-mag (sulfate of potash magnesia) is 0-0-22. I use it as my primary K source because while kelp is often mentioned as having K, there's only 1%-2.5% so it would take a lot to balance that with the 12% N of blood meal. But I still use kelp because it has other benefits besides K (growth hormones, enzymes and trace elements).