PK1
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you can't really overwater rockwool because the water drains from it. your 10% run off is correct and im sure @tobh can explain better than i do but don't over think it too much.it measures 2.7 in the 2.7 solution. maybe my understanding of rockwool isnt correct or im overthinking it myself . by the last watering i should have 10% runoff correct?? i dont know where i heard that but it sounded right to me and i figured it would be a start. that's what i based my volumes on really once i moved them into the 4" cubes. my understanding of it may be leading to excess dry backs causing tension in media and high ec runoff. when i upped the volumes it wasnt enough and pushed everything to bottom of cube is my guess. man what a ride!!! but its enjoyable to say the least . im going to figure out if you can overwater rockwool today and ill let you know lol!!
ok ill move the ec down on the input makes sense. and ill grab that app thank you for the help i sure do appreciate it ill keep you all updatedcorrect, you can't really overwater rockwool. it can become waterlogged but your volumes aren't anywhere near the level that would cause that. at the feed rate you're at, you're going to see that high of EC in the media, you can likely get away with pulling back a bit, like down to 1.2ish EC for your input. Keep an eye on those leaf spots, that looks like the start of calcium def to me, which it might've been locked out due to the lack of the plant's ability to transpire before you fixed the temps and RH.
if you have an android phone, download the vpd calculator app and play with the numbers so you know where to dial in your environment. it's much easier than trying to follow those charts which are more geared towards greenhouses and don't account for leaf surface temperatures which is a pivotal metric for dialing VPD.
ill def check out the info for sure slabs may be in my future vs bottom feeding . if it is locked out how do i fix that? flush? should i just nip them leaves now ??at this stage, don't let the cubes dryback more than 80%. Meaning, from field capacity right after a fertigation event, the blocks should not be allowed to use/lose more than 20% of that initial volume. Hand watering will be tricky to get this right, it would be better to have automation in place so you could have your shots scheduled at consistent intervals throughout lights on period to ensure the media stays in the sweet spot.
Grodan has some fantastic information on their site about scheduling events, I highly recommend you read it, especially if you're going to move to slabs. Having events that deposit 3%-5% of total media volume is ideal, and will ensure you get 10%-15% runoff throughout the day which should keep the pH and EC more consistent in the media, encouraging much more rapid growth. It's crazy how fast both can swing if you're not on top of proper fertigation.
nah leave em there for now. you'll be taking em off later anyways. you fix the issue by identifying the root cause and correcting it. could be lighting, pH, EC, or environment. You fixed environment and are working on your EC so you just have to watch new growth now. If it persists it's likely lighting is too intense and you either need to up EC or dial back the lighting, preferably the latter. flushing through with solution at target EC and pH till runoff matches input is the course you take for corrective action.ill def check out the info for sure slabs may be in my future vs bottom feeding . if it is locked out how do i fix that? flush? should i just nip them leaves now ??
i have the roie720 at 340w at 36" I appreciate everything from everyonenah leave em there for now. you'll be taking em off later anyways. you fix the issue by identifying the root cause and correcting it. could be lighting, pH, EC, or environment. You fixed environment and are working on your EC so you just have to watch new growth now. If it persists it's likely lighting is too intense and you either need to up EC or dial back the lighting, preferably the latter. flushing through with solution at target EC and pH till runoff matches input is the course you take for corrective action.
yes open line something to automate watering for a more controlled watering. good pics looks like your getting everything figured out on your sidei think somewhere you mentioned that you would go with the drip system. Nutrient build ups does plug the drippers and i wouldn't use the drip system. Our ends are open end so that the water can get the rockwool wet. with valves you can adjust the pressure of the water so you can get adequate watering.
LFG!!!!!!!Dropped the ec a bit and vpd still on point. they are taking off I can see the growth already! Thank you all for the help @PK1 @tobhlooking excellent! little dark so might drop the EC light we discussed before you start seeing burn but overall they're looking very healthy, albeit rubbing the crust outta their eyes atm.
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