Help with problem(1st grow) Flower week 5 - Mg deficiency or too much P or K

[sneakythumb]

Hello,

Growing Master under 6 1000w hps. I started to get this problem at the end of week 4. Only on 6 plants but that is 20% of my grow. I have searched and some of the problems have been maybe magnesium deficiency but I do not know how when it is getting adequate mg from cal-mag and bud candy. But then I read that too much phosphorus can cause mg lockup.

Need help diagnosing this.

Thank you.

Sneaky

 

[Maer]

Re: Help with problem(1st grow). Flower week 5 - Mg deficiency or too much P or K

what is your pH?

 

[sneakythumb]

Using coco in 3 gal pots. Soil pH 5.75 and feed is 5.9-6.1(long 1600-1750). Water everyday, 2x a day. They get 2-4 cups per feeding. Water with RO water every 6-7 days with 1.5-2 gals. Feeding Heavy 16 nutes, liq karma, sweet, big bud (powder,) bud candy, N.U.T.S, just started using ooze week 4, slica, cal-mag plus. Been monitoring and havent seen any more plants shwoing signs. But I have another post with leaves burning and all these plants have that also.

Thanks for any help you can offer.

 

[Maer]

Does your run off pH swing? There really is no one perfect pH so a pH swing from 5.5 to 6.1 is good for the plants because it passes through the max absorbtion for all macro / micro nutes. I would try adjusting your next batch of nutes to 6.1 or maybe even 6.3 to bring your ph up a bit and see if they like that.

I am no hempy expert but is giving nutes 2x per day normal? Seems like a lot?

 

[sneakythumb]

I flushed the other day and lowered the base nutes to about 40%. Friend said that I using big bud powder which is highly concetrated P and K. So he said I should lower some of the other nutes esp the base.

As for the 2x watering it is to mimic the previous drip system I used before. Just tight on space cannot use the drip system. Know a few ppl who do this also with good results. I thought it was also. Plus the second feeding I reduce to 50-60%.

Thank you for your help.