Hydro New Growth Yellow

Hi all,

Hydro (flood, drain)
Northern Light
400w HPS
58% humidity
70-78f

My plant is about a week into flowering and my new growth starts off yellow and slowly turns green. I also have a few brown, shiny blotches on some leaves. My roots are bright white and the plant is growing, but slowly.

It only liked 1/4 nutes, 3 times/day during veg, nothing stronger and thrived. I fed water for a day and then added 1/2 bloom nutes. Could this be nute burn? I did some research and the plant has the symptoms of boron deficiency, but that doesn't seem like the case. Can too much boron create the same symptoms as deficiency?

I have just diluted the nutes to see if it helps. Think this plant will recover?

Thanks!

The new yellow growth is turning green now but the tips are twisted and one leaf actually has a hole in it.

id prune off the sickly leafs, but ive also heard not to trim them in flowering so id wait on some confirmation here.

Don't cut off any leaves before they're ready if you're in flowering. The plant needs their energy and will release them when it is done. The only reason to cut off leaves in flowering is if they are infested with bugs or something like that.

With regards to the light green, I'm really not sure about hydro grows but check your pH to make sure nothing is getting locked out, especially magnesium & sulphur since they lock out at 5.7 and 5.5 respectively. It doesn't look like nute burn to me.

Antigen said:

check your pH to make sure nothing is getting locked out, especially magnesium & sulphur since they lock out at 5.7 and 5.5 respectively..

Click to expand...

My pH is about 6.0. I don't want to drop below this correct?

I think I have found the cause of my problems. I didn't ween my plants off of veg nutes. I just jumped right into bloom nutes after flushing a few times. So this is either nute burn or veg nute deficiency. Should I bother adding some veg nutes at this point?

I'm not sure about the nutrient schedule for hydro plants, but here is a nutrient availability chart that shows you what gets locked out at certain pHs. Use the bottom chart for hydro grows, the top one is for soil. Maybe it can help you to diagnose your problems. I see from the chart that both phosphorous and potassium lock out in hydro at pH 6.0, so you might want to run a slight bit lower, like around 5.8.

Anyway here is the chart:

Thanks for the info!

The plant still seems to be declining. I don't think it is a pH problem but most likely a nutrient deficiency. The plant is about 17 inches high and I am feeding it nutrients of about 450 ppm. If this isn't nute burn should I increase the nutrients?

Sorry, I don't know enough about hydro nutes to know if that is the right amount but it does not look like your plant is getting nute burn.

Hopefully someone who knows more about hydro can tell you how much you should be giving it.

450 ppm is wayyyyyy too low... what nutes are you using? in general your ppm should register 1200-1800 and that is a mid range/ safe zone most cultivators stay within.... you may want to check the conductivity in the water you are using before you add your nutes for a more accurate reading...also...how often are you changing your water?

I'm using in house nutes from a shop called Second Nature Hydroponics. I'll increase my nutes slowly by bringing them to 900 ppm and then higher. This is my first grow flowering so I was planning on changing the water about every two weeks.

Yeah you nutes are extrmely low for hydro grow. Slowly bump up your nutes. I tend to hover around the 1200 to 1300 mark for my plants. I don't think it is burn, I think they are hungry. Yellowing when starting flower tends to be from lack of Nitrogen due to the high ratio of P-K and not N. This will cause some lower and mid leaves to start yellowing out because the plant is using the stored nutes int he leaves in order to sustain growth.

Hope this helps somewhat

well first off if you measure the ppm of your water you will probably find it is conductive...some only 50 ppm , others 200 and higher... if your water contains a ppm of say 150 and you plan to use 900ppm worth of nutes then your meter should read 1150...i would suggest building up to 1800 as most plants have no problem with those levels...slowly bring them down during the last two weeks and give it a good 5 days of just ph'd water before you harvest... as far a watering is concerned ,every two weeks works for some but you find within a weeks time your ec will drop and ph will rise... depending on the npk ratio...the plant could be using up all of one nutrient before you change your water... some just top up to save nutrients others will change everyweek...in this case , the benefit to changing every week is to keep the nutrients the plant isnt using as much from building up... just try to keep your ec and ph around the same levels at all times...I would suggest flushing with a new low ph , proper ec solution instead of plain water to try and corect your def. and combat salt build-up

ha... Correction..i meant to say if your water contains a ppm of say 150 and you plan to use 900ppm worth of nutes then your meter should read 1050... sorry for the confusion...

How are the babies?

My plants look like this what did u figure out
thanks

The plant is doing great now. I increased the nutrients from 450 ppm to 1350 ppm.

Very nice.. I'm glad to see they're doing better...what do they take , 9-10 weeks for flowering?