Nute burn or ph issues

[Smokingjallday]

Hi guys this is my first auto grow she is 47 days old from seed she is getting some purple around the edges on top flowers and yellowing aswel feeding biobizz grow 1ml/l,bloom 2ml,alg a mic 1ml/l ph at 6 using canna pro soil plus need to know to cut down nutes maybe or i dont know wats going on

 

[Beerhunter CDN]

I’m not familiar with Canna Pro soil, is it an actual soil or is it a soilless medium? Your plants look deficient and possibly locked out of a macronutrient. In flower, they demand more Phosphorus and potassium hence the separate bloom nutes. What is the pH of your nutrient water? Water only? Are you following a Biobizz feed schedule? Are you watering to runoff?

 

[Smokingjallday]

Hi thanks for the reply my tap water ph is 6.4 after 24h. With the nutes its at 5.8 i add 2 drops of biobizz plus ph to bring it to 6 but i think my ph Meter is shit it reads really slow with nutes in so ordering hanna phep 2mo run off is usually good bit not following biobizz feeding schedule as it looks like its burnt at the moment even with low doses

 

[Beerhunter CDN]

I’m sure that you are not nute burnt. What are you using to gauge when to water? Lifting the pot? Moisture probe? What is the concentration of your nutes (EC, ppm) and the concentration and pH of your runoff? Ideally, a slurry test will help you measure the pH of the root zone.

 

[Smokingjallday]

Hi again using a cheap ph pen always have to calibrate it will be ordering better one today im lifting the pot watering every third day and measuring run off aswel had it few waterings before testing at 5.3 the last watering was ph run off 5.9 so its gone up a bit dont have ec or ppm meter only ph meter at tge moment

 

[Beerhunter CDN]

If I had to guess, your pH is off in the medium. I started with a $10 pH pen but I spent a bunch of time calibrating and still not trusting it. I spent a little bit more on a better one and it makes a world of difference. I use an Apera pH20, pretty reasonable compared to Blue Labs. Anyway, your target pH should be higher for soil like pH 6.4-6.8. You’re medium pH is coming out too low for nutrient uptake and the plant is starving for nutrients. You need to pH your water higher and give it a good watering with lots of runoff. Water slowly. This will help rinse out the nutrient imbalance and reset the soil in the root zone to a pH where the nutrients are available to the plant. Does that make sense?

 

[Smokingjallday]

Hi that makes sense to get higher ph level in soil for uptake but its stating on the bag to ph to 6 as its soilless medium so i thought 6 is good but runoff was low so ill try tonite or 2mo with ph 6.4 maybe and see is hanna phep any good its about €60 delivered to me

 

[Beerhunter CDN]

I’m not familiar with them really but I’m sure there are enough reviews for them out there. I just know that it saved me a lot of grief by spending a few dollars on a decent pH pen. Money well spent. As for EC/ppm pens, you can spend a little less in my opinion as the technology is fairly simple and still get trusted results.

 

[Smokingjallday]

Thanks mate should get it 2mo wats the best to store the meter in ill check the manual of the meter when it arives 2mo aswel

 

[Boognelson87]

Do you feed cal mag? I used biobizz and was finding myself needing 2.5 ml/l of bloom and grow around this age as well.