hi all, this is a green house seeds white rhino that is about 4 weeks old. it was germinated in a root riot cube, thn transfered into a 3 inch rockwool cube. its is now in cellmax (1cm rockwool cubes) with a layer of clay pebbles at the top and bottom. it was fed on formulex seedling food until it was a week or 2 old and is now n vitalink max grow feed at between 1.0 and 1.2 ec and a ph of 5.8. handwatered. it is under a t5 lightwave (4 flourescent tubes) which is about 6 inches away. i tied the top down for a week and all seemed fine, i untied it a few days ago as it has become more bushy and have now noticed these brown patches. can anyone tell me whats going on please? i want this to be a mother plant.
thanks for the relpy, the newest leaves coming out of the top also have some marking on the tips. what should i do to cure this? up thec to 1.4? i have grown this before with aan ec of 1.4 at this stage and havnt had this problem. have i just answered my own question??? is it not anything to do with heat? temps peak at 85 deg f, humidity is only about 30%.
You can add a teaspoon per gallon of epson salt, but I think people are too quick to throw around deficiencies around here. Looks like a PH issue to me.
to be fair i havnt checked my run of for about a week. i think i'm going to up the ec to 1.4 and check the run off ph. i thought deficiencies usually show yellowing of the leaves and mine are not at all yellow as you can see.
too low or too high?, its been going in a 5.7 or 5.8 i know i need to check the run off next time but do i go in a 5.5 or 6 for the next watering?
I do hydro man, I dont know for certain, I know it's real important what your run off is, that you run off at least 20% of what you put in, and you only water when it's dry. but that's about it. sry
well 'll see what happens when i up the food and check the run off. should i remove the affected leaves or will they repair themselves? sorry if thats a stupid question but am only on my second grow.
I'm on my first, I just read a lot, like constantly lol. Not a stupid question, you will get differing opinions on that one (like everything). I would leave them under the premise that she will drop them when she is done with them. But since you are in early veg, I dont think it will matter either way.
leafs do not repair ...ever..... dont pull them as they will be a good indicator on when the problem is solved.. ph causes def... so #1 keep ur ph correct....your in dirt so 6-5 To 6.8 is what you need...
thanks for your input, i am NOT in dirt, i am in rockwool cubes. that is classd as hydro isnt it? so ph between 5.5 and 6.5???? do i need to flush or just feed and measure the run off? should i be feeding every watering as a general rule? with other plants i have only used clay pebbles with flood and drain and not had a problem. i thought hand watering in rockwool would be easier, obviously not!
hydro is 5.8.... dont let it get lower then that... when it does it locks out mag... so im thinking if you keep it at 5.8 it will most likely stop. that is classic ph signs man... ....hope this helps you bro.... this is all my opinion... so everyone knows...
update! i poured in 1 litre of tap water ph'd to 6.0 with a background ec of 0.4 run off measured ph 6.7 and 1.1ec then i put in another litre of tap water ph'd to 5.7 with a backgrond of 0.4ec run off measured ph 6.4 and 0.7 ec the i put in another litre of tap water ph'd to 5.5 with a background of 0.4ec run off measured ph 6.4 and 0.5ec. so does that mean that my rockwool is currently at ph 6.4? this is obviously as higher than i need. do i keep flushing or adding nutes at say 1.0ec with a ph of 5.5 and check the run off hoping that the ph comes down? also does this give any further indication of what exactly my problem is?