Anyway, I was wondering what the optimum levels of nitrogen, potash, and phosphorus in the soil (not in fertilizer or nutes) is for cannabis?
Jump to content
Advertise on Grasscity.com - MANTIS Announces Publishing Partnership with Grasscity
Posted 11 March 2009 - 12:55 AM
Posted 11 March 2009 - 01:02 AM
Posted 11 March 2009 - 01:06 AM
The plant has different needs for vegging than for flowering. And... the nutes you give it by ferting it and the nutes it gets from the soil, I don't think the plant can really tell the difference.
20-10-10 for veg
10-20-20 for flower
Posted 11 March 2009 - 01:13 AM
So, if I used a rapitest soil test kit, it would measure the NPK levels on the same scale that you refer to? I really don't know.
Posted 11 March 2009 - 03:39 AM
Sorry I don't know anything about soil test kits
Grandpa's grow guide has recommendations for NPK ratios, doesn't mention soil testing though.
Earlier by "20-10-10" I meant ratio 20N-10P-10K
Grandpa recommends 10-60-30 or 10-30-20 for flowering
Posted 11 March 2009 - 02:28 PM
Edited by toastybiz, 11 March 2009 - 02:29 PM.
Posted 14 April 2010 - 11:51 PM
0 members, 1 guests, 0 anonymous users