Please help wot 5 week old plant yellowing

[NugNewb]

This is a strawberry kush CBD plant. I don't know if it's me or the genetics but this strain i purchased is giving me all kinds of trouble. This is my most successful one out of five i tried to grow. Let me give the details first...
In happy frog soil in 5th week of growth. 1000w LED Gixxer light at about 28 inches. Started in a solo cup and transplanted last week. While in the cup the plant started yellowing from the bottom up. Looked like nitro deficiency so while in cup I tried a half strength feeding... still no change after a week. I then transplanted to the air pot that is her new home. It had happy frog soil with worm castings, little bit of lime and 25% perlite. I figured the plant might perk up in better soil. I have a fan for circulation and temp hovers around 70 with 50% humidity. The roots looked really good and strong when removed from the cup and I watered with some recharge in the transplant to help the roots take hold. But the yellowing is getting worse and now growth is slowing... I properly ph everything and only water once a week if needed, I use a meter to check the soil if it needs watering. Should I continue feeding despite it being in new soil. I did notice slight yellow tips.. I need help cause it's starting to look bad.. pics attached and thank you...

 

[macsnax]

Looks like a ph issue to me. Burnt tips and def usually points to ph issues. I can see a little calcium def coming in to, which further point to ph issues.

 

[NugNewb]

Looks like a ph issue to me. Burnt tips and def usually points to ph issues. I can see a little calcium def coming in to, which further point to ph issues.

What do you recommend??? should I add Cal Mag+ to every other watering??? What about pests, I just found two gnats flying around the room...? Any recommendations on a pesticide or nute schedule, thanks????

 

[macsnax]

What do you recommend??? should I add Cal Mag+ to every other watering??? What about pests, I just found two gnats flying around the room...? Any recommendations on a pesticide or nute schedule, thanks????

If you have gnats, you're over watering. It's probably the cause of everything else going on. Correct the over watering and go from there.

 

[Driver733]

I use a meter to check the soil if it needs watering. ...

Moisture meter is not recommended, they are not accurate.

The best way to tell when to water again is to weigh the pots - first, when they are full of just dry potting soil, then you know the dry weight. Do not water until the pots are down to the dry weight, no matter what you think they need, just be patient and let the pot dry out. The rest will resolve itself.

I use a scale with the dry weight of my various pot sizes right on the scale:

 

[Granite]

Moisture meter is not recommended, they are not accurate.

The best way to tell when to water again is to weigh the pots - first, when they are full of just dry potting soil, then you know the dry weight. Do not water until the pots are down to the dry weight, no matter what you think they need, just be patient and let the pot dry out. The rest will resolve itself.

I use a scale with the dry weight of my various pot sizes right on the scale:
View attachment 4779085

Interesting, how do you account for the plant weight as it grows bigger? Or is that ignored?
As the plant grows you might not come down to dry weight of pot+soil no matter how dry it gets?

 

[Driver733]

Interesting, how do you account for the plant weight as it grows bigger? Or is that ignored?
As the plant grows you might not come down to dry weight of pot+soil no matter how dry it gets?

The weight of the plant as it grows is negligible, most of that weight is water, but as the plant grows I will adjust. For example, the largest pot weights between 3600 and 4000 grams depending on how much dirt is in the pot, so I go 4000 grams and see how the plant looks.

I just watered yesterday, 2 pots were down to 3700 grams and looked great, no wilting at all. I watered and they didn't droop, just perked right up, so I know I waited long enough. If they droop when you water, then you could've waited a little longer.

I also have a runt that weighed 4700 grams yesterday, so I didn't water that one. It was down to 4300 grams when the lights went out an hour ago, I will weigh it again in 5 hours when the lights come back on. I will wait until that pot is down to at least 3800 grams which will probably take another day.

It is especially helpful to weight the pots when the lights go off because I don't like to water right before dark, I prefer to wait until the lights are on so they have a full day in the light with fresh water. However, sometimes I have to water before lights out because they are so dry waiting another 6 hours will cause them to wilt. So it's a balancing act.

In general, the longer you can wait and the drier the pot gets (to a point, wilting is bad), the better the cannabis plant will do.