Nitrogen deficiency

[Albertslund]

Hello fellow gowers. This is my first grow: 21 plants cbd and thc. Only one plant in photoperiod the rest is autoflower. 5 days ago I replanted a lot of them into 15L textile pots. Medium: 60% coco, 30% perlite and 10% fresh compost. I use Biobizz Fishmix as fertilizer NPK: 5-1-4
Now 11 plants are showing deficiencies in their new pots. I'm not sure what to do and it's been progressing the last 2-3 days. Please help me!

 

[NuttyProfessor]

what ph are you feeding , i dont add compost to my coco , just perlite , i take it they are outside , you getting plenty of light and temps ok ?

 

[Albertslund]

Water pH is 6,5-6,6 and medium pH is 6,8
Do you think its a bad idea with compost?

 

[NuttyProfessor]

your ph in coco should be 5.6/6.2 veg then up to 5.9/6.5 flower ...the compost sometimes just gives some pests and it will buffer you ph a bit , well not so much you only have 10 percent , lucky enough ... you go by hydro , left side of this chart ... they will come back , they are young enough autos

 

[Albertslund]

That's a lot lower than I expected. How will I get the pH of coco that far down? Thank you. Your a life saver, spent a lot of energy on this project

 

[NuttyProfessor]

buy some ph up and some ph down , a ph pen will keep you right, dont go cheap either get one that will last and give you the right readings

 

[NuttyProfessor]

the one in this link is same as mine , i love it , great price also

ETI Pal Pro ph Pen, Digital Nutrient pH Tester | eBay

 

[NuttyProfessor]