A
anarchov
- 3
- 3
I am new to the forum and growing cannabis, but not new to hydroponics. I used to operate a commercial hydroponic lettuce farm (NFT) where we grew about 1000 lbs of lettuce per week. While operating the farm, our nutrient regimen was backed by some pretty solid research of optimal hydroponic solutions that included ppms of each chemical element. I have a lot of this research for lettuce, tomatoes and cucumbers but not for cannabis. We used all dry fertilizers in our operation due to the cost savings and I hope to switch to the same with my cannabis grow (I just started growing with the most readily available liquid nutes in my rural area, fox farm, a year ago).
I have been looking at Jack's 321 and crunching numbers on nutrient ppms based on their recommended rates per gallon- 3.7g part A 2.5g part B 1.1g MgSO4:
I also stumbled across this research paper: https://www.preprints.org/manuscript/202108.0460/v1
To summarize the study- "Based on the results of this study, we recommend providing plants with a nutrient solution containing N and P at approximately 194 and 59 mg L-1 , respectively, to achieve maximal inflorescence yield." Optimal K supply was found to vary based upon cultivar.
While this is just one study and is far from conclusive, has anyone experimented with lower P rates and higher N rates with success? I will probably just start with the standard feed suggested by Jack's 321 but was curious if anyone had any real word experience with reducing P rates.
I have been looking at Jack's 321 and crunching numbers on nutrient ppms based on their recommended rates per gallon- 3.7g part A 2.5g part B 1.1g MgSO4:
N | 151.24 |
P | 117.29 |
K | 254.13 |
Ca | 125.48 |
Mg | 28.48 |
S | 37.49 |
B | 0.49 |
Cu | 0.15 |
Fe | 2.93 |
Mn | 0.49 |
Mo | 0.19 |
Zn | 0.15 |
I also stumbled across this research paper: https://www.preprints.org/manuscript/202108.0460/v1
To summarize the study- "Based on the results of this study, we recommend providing plants with a nutrient solution containing N and P at approximately 194 and 59 mg L-1 , respectively, to achieve maximal inflorescence yield." Optimal K supply was found to vary based upon cultivar.
While this is just one study and is far from conclusive, has anyone experimented with lower P rates and higher N rates with success? I will probably just start with the standard feed suggested by Jack's 321 but was curious if anyone had any real word experience with reducing P rates.