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Grams Per Day: Determining Cannabis Yield Success by Weight

Rider509

Well-Known Member
I read an interesting article by Ben Burkhardt, who once owned the largest indoor grow facility in the country. He found that there was no simple metric for yield analysis which took into account not only the power used by lights but also the length of flowering time. Often yield is stated as grams per watt, but that doesn't take into account the difference between a plant that finishes in 45 day versus a plant that takes 90 days. He put forth a metric that takes both into account and works for the closet grower as well as a huge commercial grower, and returns a number that can be compared across any grow type.
The equation is as follows: Yield in grams ÷ number of 1000W lights ÷ days in flower = GPD average.
As an example, my three plants were under 1600W of leds and took an average of 90 days, and yielded 3000 grams of dry flowers.
3000g ÷ 1.6 ÷ 90days = 20.8 grams per day.

Here's a link if anyone would like to see the source material.
Grams Per Day by Ben Burkhardt.
 
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PurpleGunRack

Well-Known Member
Nice one, but I must say I judge crop success on a lot more than just weight and often find that the strain that yielded half of the top yielder in a grow is better on all other parametres than yield :)

I think price per gram says much more than g/w and g/m2, I usually factor in everything in a spreadsheet, but it lacks the abstracts such as effect and terpene profile which are the most important to me, but it's still fun to see how things stack up.

 

Rider509

Well-Known Member
Good post Rider! Can even go further n figure how many gram per day per watt then figure your electric usage n figure out exactly how much it costs to grow every gram.
Do we really want to know that, Marz? I prefer blissful ignorance of how much I spend. :hmmmm:
:ganjamon:
 

Rider509

Well-Known Member
So....this basically says that unless I get 2.5 oz per Auto, I’m having crop failure.
From a commercial grower's point of view, yes. But us hobby growers just smile and wave as we drive by the people standing in line at the dispensary.
 

InTheShed

Member of the Year: 2018 - Member of the Month: Jan 2018, Nov 2018 - Grow Journal of the Month: Aug 2018 - Plant of the Month: Oct 2018

InTheShed

Member of the Year: 2018 - Member of the Month: Jan 2018, Nov 2018 - Grow Journal of the Month: Aug 2018 - Plant of the Month: Oct 2018
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