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Hey KJC!!! Thank you so much for stopping by!!
Your small plant appears to have a phosphorous deficiency and possibly a calcium deficiency. Your medium size plant appears to have either a developing phosphorous deficiency or a calcium deficiency. I believe your larger plant is better able to deal with the adverse conditions.
I believe your plants deficiency's are most likely from 2 things
1) FoxFarm Ocean Forest soil is considered to be high in nutrients and are often too high in nutrients for seedlings and small plants.
2) The addition of FoxFarm Nutrients to an already high nutrient soil has resulted in a nutrient buildup in the soil and has also caused the soil pH to drop out of a favourable pH range. The FoxFarm Nutrient Schedule also calls for regular flushing, have you been flushing your plants pots?
I have not flushed at all yet...Some suggested I wait...And according to the FF feeding chart I am supposed to flush after 4 weeks...I was scheduled to perform a full flush a week from today on 07-21-14 but I will be moving that up to today
I believe you have a nutrient buildup in your soil that has also resulted in your soils pH dropping out of favourable pH range and you should flush your soil with at least twice the amount of pH adjusted water as pot size or until the runoff is pH 6.5.
I notice the amounts you list for your nutrient mixture, are those per gallon or per quart?
It should say it in my notes but if I left it out I apologize...All teaspoons of nutrients are per gallon
The FoxFarm nutrient soil recommended dosage is for soils that are not already high in nutrients. I would use 1/2 the recommended dosage and see how your plants react.
I have been using half strength on each of the nutrients according to the Fox Farm soil feeding chart that I obtained from their website...The chart I have been using is different than the one you provided...see my image below:
Here is the FoxFarm Nutrient Feed Schedule for Soil
You want pH 5.8 for hydroponic and soiless (peat moss and coco coir) and pH 6.5 for soil.
Here is a nutrient availability chart
Here is a cannabis leaf deficiency chart
here is the Cannabis Plant and Pest Problem Solver and the Plant Abuse Chart
Cannabis Plant and Pest Problem Solver: Pictorial
Plant Abuse Chart
For vegetative growth I would use a 18/6 18 hours of light and 6 hours of darkness lighting schedule. I read a study where lighting schedule versus root length was tested and plants grown under a 16/8 lighting schedule grew the longest roots, 18/6 was not tested. I was made aware of a study where lighting schedule versus growth was tested and plants given at least 5.5 hours of darkness grew the most.
A soil or soiless mixture lower in nutrients is more appropriate for use with the FoxFarm Nutrient Feed Schedule.
Here is my soiless mixture
I use peat moss, perlite, vermiculite and mycorrhizae for my plants. I would mix your soiless mixture in a ratio of 60% peat moss, 20% perlite and 20% vermiculite. If you can get Pro-Mix HP you would only need to add 20% vermiculite and mycorrhizae. Vermiculite acts as a catalyst between nutrients and the plants roots as well as retaining moisture.
PRO-MIX HP Mycorrhizae - High porosity peat-based growing medium
https://www.hydro-organics.com earth juice rooters mycorrhizae
You want 70°-90° Fahrenheit and 50%-70% humidity for vegetative growth and 30%-50% humidity for flowering. What size exhaust and fans are you using in your attic space? You may have to reduce the amount of Compact Florescent Lights you are using or increase the airflow to reduce the temperature in your grow area. If your humidity is too low consider using a cool mist humidifier either in your grow area or in the area where you air intake is.
to my journal!!
, to 6.5 pH...
