So, this morning I took Rose out of the tent and in to our sun room. I wanted to use natural light to avoid any spectrum bias from the LED's. The natural coloration of the all the leaves in general do not present as much yellow as under the lights. I plucked two more of the older leaf fans which were presenting as the others I've posted. Reviewing the situation from outside the tent gave me a better feeling about the overall health and severity of what I thought I was seeing and shared here.
I thought it was prudent to check a couple of things in case there might be a need to flush the soil and pick the feeding back up after a "clean sweep". I watered with RO yesterday (14 8oz cups of RO and 2 cups of RO containing a dose of mycorrhizae). From the drain holes in the container a small amount of runoff remained in the bottom of the catchment overflow. This had been sitting there all yesterday afternoon and through the night till I was able to access the tent after the lights came back on (around 1100 this morning). I was able to get enough pf the runoff to do a pH test which I ran twice. Both times the pH reading was a solid 6.5. I then used a pipet to gather as much remaining effluent as possible to run the TDS. I barely was able to get enough to submerse my meter. I strained it through a clean coffee filter to remove the detritus. I tested, cleaning the electrodes between each test with RO water, and the TDS indicated an average of 3050 ppm. Clearly too high, but you have to keep in mind that the samples had been in the catchment for about 24 hrs and that evaporation had been occurring during that period and salt concentrations would have been measurably increased as a result.
So, I'm thinking now I could flush with RO and start over on the nutes or, water a couple of more times (roughly every 36-42 hours; the soil and plant clearly needs this schedule as measured by soil dryness, container weight and relative humidity readings inside the tent) with RO water and monitor the TDS's after each watering. I am amenable to reintroducing the CaMg and increasing N to a responsible level. I've been watering with RO and nutes to around 1300-1400 ppm during the 28 days in flower.
I sue Advanced Nutrients pH perfect base elements of Micro, Grow and Bloom and have been adding Big Bud since the second week in flower. Both Bloom and Grow contain S, .2% and .5% respectively. My nutrient schedule has been every other watering, so about feeding once every four days.
Would appreciate any other observations or suggestions you all may have. Thanks very much.
) and Nutty sKunK !!