Every Grow I Get This Problem

[Haunts]

Problem: Every grow i get this problem about 4 weeks from ending. Spots, Yellowing
Medium: Plant Magic Soil Supreme
Feed: I only use the Grow and Bloom following this schedule but at half strength, also use 0.5ml cal/mag every other feed.

Strain: Sweet Skunk Automatic
Climate: Max 27C Min 20C, Root Ball 20C (controlled with thermostat and heat mat)
Additional info: It usually starts about 4 weeks from end? Every grow i get this problem

These are images from my previous grow but it is happening the same with my current grow.

 

[namvet25]

What are the npk numbers of your nutes? Your 0.5ml cl/mg,is that per litre or gal?

 

[Chester]

Looks like ... http://www.growweedeasy.com/calcium-deficiency-cannabis

I feed mine 5-10ml / gal of CalMag w/ each watering ...

 

[Spanglish]

If you are using the plant magic calmg then 0.5ml/L every other feed looks to be good for when you start off but as you get further into flower they are going to need more so would then up it to 1ml/L every other feed and later on still as chester said every feeding until a week or two before harvest when you can cut it out of the feeds completely.

 

[Spanglish]

What are the npk numbers of your nutes? Your 0.5ml cl/mg,is that per litre or gal?

Here is the nute brands homepage bro, details on the NPKs and doses can be found there,

http://www.plant-magic.co.uk/products/magne-cal-/7/

 

[namvet25]

Even for organic those numbers are really low and the cal/mag doesn't list how much it contains.whats up with that?

 

[Spanglish]

CalMg looks to be

N 2.6%
P 0.1%
K 0.3%

Is listed at bottom of the page i linked to in a really light coloured text.

The NPK on the grow and bloom seems to have less P and K than Bio Bizz when combined but more N, could be a marketing thing i suppose as Bio Bizz dont sell any kind of PK booster and Plant Magic do, i have always thought of Bio Bizz as mild so yeah suppose those PK numbers looks a bit on the low side.

 

[namvet25]

Most cal/mag doesn't contain npk.I saw those numbers but I didn't see actual percent of calcium and magniesium.I think his problem is low npk numbers and not enough cal/mag.

 

[Spanglish]

Found a bit more on the contents from the following link http://www.onestopgrowshop.co.uk/nu...plant-magic/plant-magic-magne-cal-500mls.html

Plant Magic - Magne-Cal+ recommended dosage for Soil/Coco: 0.5ml-1ml/Litre

Plant Magic - Magne-Cal+ recommended dosage for Hydroponics: 1ml-2ml/Litre (important - mix thoroughly before switching the pumps on!)

Plant Magic - Magne-Cal+ NPK: 2.55 - 0.11 - 0.33

Plant Magic - Magne-Cal+ Calcium content: 3.54% (as 4.96% Calcium Oxide CaO)

Plant Magic - Magne-Cal+ Magnesium content: 1.55% (as 2.58% Magnesium Oxide MgO)

Plant Magic - Magne-Cal+ Iron content: 0.0424%

Plant Magic - Magne-Cal+ Molybdenum content: 0.0011%

Plant Magic - Magne-Cal+ Zinc content: 0.0073%

 

[Haunts]

Sorry for the late reply, i've been super busy at work today. Here are the NPK numbers for the Grow and Bloom:

Grow - 5-3-3
Bloom - 3-5-4

I don't use the plant magic cal/mag because they don't class it as organic so ive been using Humboldt Equilibrium cal/mag. The percentage on the back says 12% Cal and 2% Mg, and the NPK is 1-1-2. Use 1-5ml per gallon but i converted it to litre.