Discolouration at top, couple weeks to harvest.

[awolace]

Hi, can anyone help me out with this deficiency. Day 50 of a 65 day strain. Plastic 10l pot, fed when dry with bloom and pk boost. Ph in is 6.8, she has suffered from the start, is short in stature and has twisted / curled leaves but has plodded along. This has come on over the last week. I feed every watering and she has not been flushed but haven't noticed any real issues apart from this apart from slight yellowing on bottoms few leaves.

 

[Waira]

...looks like Zn to me, the most common mircronutrient element to be defc.,... best fix is a dedicated micronutrient supplement, like Earth Juice MicroBlast, but there are lots of others,.. just check out the labels to be sure it's there... Zn is immobile within the plant, so newer growth is affected first... doesn't reverse, so it's a halting of progression to look for,...

 

[derek420colorado]

@Waira you are such a G!!!

 

[Waira]

:smoking: Cheers Derek, thank you! ..appreciate you helping here and there too, mate-

..awolace-- I forgot to mention, try to get you pH down to mid-to-low 6's,... Zn, Fe and some other metal micro's lock out fast as you get near to and over 7.0,...

 

[derek420colorado]

@Waira this is the only section where there is virtually always something to respond to and I remember when I was a new grower I had more questions than God should allow so I feel obligated to try and share anything that can help(nothing like you I mean you seriously are like the autoflower Dr. House!!) . Also @awolace here is a nutrient availability chart that really helped me, soil is on the right of the chart and Hydro is on the left. It just shows what nutes are available at different pH levels, hope this helps

 

[awolace]

Cheers for all the help guys. I'm on my final flush now so will apply all this to my other grows and hope it doesn't crop up again.