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MicGrow

Nutrient strength sure, but what about volume?

Hey folks.

People talk a lot about nutrient strength in terms of how many milliliters of feed to a litre of water.

However, what's rarely discussed is the volume of feed. Is it just assumed that pots are totally saturated on a wet dry cycle with a fully mixed feed?

Many people use plain water regularly or intermittently.

I've got into the habit of "pre-wetting" dry pots with plain water through a dripper system. I then hand feed my nutrient mix with a watering can a short time later.

 

Are there any tested rules about volume? What have people found?

 

 

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Fully saturate the medium with at least 10%  runoff. :)  Easy as pie.

 

Edit - remove volume of pot. Should be 10% runoff of the total volume absorbed by medium. 

Edited by Saddam
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As simple as that. Thanks mate.
 

I still find I get some drooping, slight clawing and sometimes slowed growth from a big watering. Just like "overwatering" but starting from 100% dry for sure. They always recover fine. I water over a few minutes allowing a proper soaking, there's runoff in the saucers which the soil soaks up over five or ten minutes. I never leave them standing in water.

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No problem man, what size pots are you flowering in? If the soil's still soaking up feed then it's not fully saturated, I'd feed them slower, get the 10% runoff (minimum)  then remove the all runoff from the trays/saucers  with a wet vac, sponge, mop or whatever.  As long as you stick to wet/dry feeding cycle, you shouldn't go far wrong. :) 

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Something I've picked up as a general rule of thumb is the root ball when fully developed should take up 25-30% total pot volume . IE 11ltr pot = 2.5/3ltr total volume of nute solution per feed. 

 

I find this to be quite accurate. You don't get full absorption until flowering . Mine tend to stay around 20% of pot size in veg. 

 

HTH 

:yinyang:

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