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SCROG McDuck
<< I'm not sure..2-3 wks of only water not good for plant. especially if desire large, aromatic flowers, w/ nice texture...
boron, manganese & calcium are needed to fully & properly develop fruit. & lots of potassium - up to 4400-500ppm. in tomatoes, there is blossom end rot, in other certain plants, there is generally calcium (top) & magnesium (bottom) deficiencies... but b & mn also help fruit ripen to peak maturity... iron, manganese & calcium immobile in plant, so once not supplied, those parts w/out it stored have none...
the anionns (sulfates, phosphates, nitrates, chlorides) are held mostly in solution, not on particles...so if no flowing solution, these rinse out easy...
the opposite may be good.... increase ec to 3.5-4.0 (2500-3000+ppm). this gives slight water stress, but not much, as sub-irrigation (ppk/passive hidro) keep water present. it increases concentration of elements required for fruit/flower finishing.
I've never heard this before... Ph still 5.4>5.8ish?
Must be a B to keep the Ph there..
not every gardener do this... but ec can slowly rise wkly... "flushes" can be every 5 days. just pour in water to res, run for 24h. end...re-fill tank w/ regular ferts.
We 'are' talking PPKs here, mistress, yes? The controll tank..
I would think that it woud take more than 24 hours for
'flushing' to work in the PPKs...
flush only requires 1-2 waterings (han)...or....1-3 days recirculation.
the plant requires in-organic elememts 100% of tyme. espcially cal, mag k & sulfur during flowering + the ^^^ micros
another option, maybe in pages back... crf's. can insert a crf @ begin of season, or simple break off small piece(s) @ wk 3-4, & insert into coco. 1in down... then slow-release for final 2-4 wks & feed only r.o./h20...
if desire to increase flavor/aromatics/texture - add gh fl0ralicious bl00m. every other water @ 1/2-1 tsp/gal...
"flush" coco last 2-5 days.... or every 3rd water (hand)/1x/wk (recirculation). end..... much more difficult to insert calcium into feed regime, once absent...the fruit may suffer for 1-2 wks w/out signs - then yellow bottom leaves (>mg++), stunted, yellow tops (>cal++), small, airy fruit (>b-)...
hope this help