I shied away from you on this topic because it is a bit much for my head.
I understand how important the concept is but never put into action.
But yea, good stuff.
2 Likes
I bet you could teach me a thing or three! Yes this place is such a treasure trove of information and personalities. Having a good time and hopefully helping to share information and ideas 
while learning new things.
4 Likes
From the camp of Bruce!
This is a really great tool to calculate sunlight PPF (aka PPFD aka PAR) at any time of day and any day per year and any location and elevation. The only trick is the sky has to be clear, as in no clouds, etc., for the calculated PPF to be the actual PPF.
The PPF value provided is very useful for a few different reasons. Including planning a greenhouse (and whether it will need supplemental lighting), forecasting when it may be too bright outside for the plants so you can plan on how to help them, note effects of PPF on plants without an expensive quantum sensor, etc. Also, this tool is used to check the accuracy of quantum sensors, for example LI-COR LI-190 and Apogee ‘sunlight’ calibrated quantum sensors.
Make sure to read the “INPUT AND OUTPUT DEFINITIONS” section to know how to use this tool:
http://clearskycalculator.com/quantumsensor.htm
3 Likes
I also grow using the “Bugbee Method”. It has made growing super easy for me since it’s an easy formula to follow. Dr. Bugbee is the best.
5 Likes
Get your water tested. Once I did, moved off 20-10 -20 to 15-5-15.
They love it. Worth the $35.
3 Likes
I found Dr. Bugbee on the internet when covid arrived and I decided to grow my own. I found his video on the 9 cardinal parameters. This information has become my backbone. It keeps the plants healthy and flourishing. . The quality and strength come more from genetics than any turbocharging of of the grow method. I haven’t tried any sort of hydroponics yet. My yields in Coco Mix are very satisfying. A huge thank you to Dr. Bruce Buge for sharing his knowledge.
3 Likes
Case # 1. Assume a transpiration to dry-mass growth ratio of 300:1 and a desired K concentration in the plant of 4% (40 g kg-1). For every kg of plant growth, 300 Liters of solution went through the plant, so there must be 40 g of K in 300 Liters of refill solution, or 0.133 g L-1. The molar mass (atomic weight) of K is 39 g mol-1. The refill solution must have 0.133 / 39 = 0.0034 moles L-1 of K in it, or 3.4 mM K.