New Problem
So, ever since this yellowing thing started, the pH in my reservoir has been dropping, sometimes by .5 in 24hrs. I think this occurred on my first round and I probably attributed it to the different phenos feeding differently. The Dutch Master Gold nutrients that I use are meant to rise in pH so you set at 5.5 and adjust down at 5.9. I'm on my 6th or 7th grow with this stuff and it has been so reliable that I don't even own a bottle of pH Up.
I referred to this chart from the Flairform website for some insight as to what might be happening in the res:
Considering the stage of flowering, the pH situation, and the chart, I confirmed my suspicions that the plants were consuming allot of K and little N thus causing the crash.
Enter POTASH+ (0-4-9)
By introducing this product into my lineup, the days of mindless mixing are gone. Now I have to formulate for at least 2, maybe 3 stages of flowering.
I blame it all on the Haze!
So, Ive been trying to maintain about 100 ppm's of P+ for the past few days and my pH is still crashing and the E.C. goes down. This tells me that the plants are hungry as hell which is kinda amazing since they've been such light feeders up to this point. I'm guessing that since I added the P+ to the already nitrogen-rich res is why the pH is still crashing. Apparently I need to feed them P+ and micronutrients only at this point which I kinda figured was going to be the case when the problem started.
I'm going to replace the res tomorrow and if my formula is good then the pH should stay in range. The plants look good so they haven't been adversely affected by the pH swings and I could nurse the pH everyday and everything would probably to fine but remember that my big goal is to go 7 days with no maintenance. I get to go on vacations and the plants get to go nuts when the res has that kind of stability.
Round 3 will have an 8 gallon reservoir which will be far less stable than the 24 gallon system I'm running now but that will allow me to keep a closer eye on the feeding habits of my girl and do more frequent replacements which will be an excellent environment to base my formulations on. I'm taking the approach that E.C. fluctuations are related to nutrient strength and pH fluctuations are related to NPK ratios and formulate my regime based on that.
To put a kink in things, I'm also doing some color spectrum experiments as promised which will not help to make accurate conclusions but hopefully get the results I want. The good news is that I will start Round 3 with the same feeding regime as Round 2 so there will be some conclusiveness as to the color spectrum experiment. The goal will be to get 2-3 feet of stretch in the first 4 weeks of flowering. My cab is grossly over-lit but if I could fill the walls with vegetation there would be less light intensity. What happens is that the light is too intense on a small plant so it never climbs. The plant isn't smart enough to know that if it stretched out it would reduce the amount of reflectivity coming from the walls of my cab.
So here's the first filter I'm going to use. Neon Pink:
This is a 33% transmission filter but 90% of that loss is outside of the plant sensitivity curve. In a sense, this is the control group, not an experiment as it has the least amount of variables. Let's see what happens when you eliminate useless photons.
If that doesn't give me the stretch I want then I will aggressively reduce the blue spectrum with this filter, Apricot:
My goal is to get a V-shaped canopy in the cab for up to 12 square feet of canopy which will drop my watts/ft2 down to 50 and give me a gianormous Mango Haze harvest.
I've got a good feeling about Round 3 and there is a gorgeous Mango Haze lady in the bull-pin that should be pretty bushy by the time I complete this round.
Single plant, single hydro, pink light. Stay tuned.
Peace.