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Hi Hypeshot!
Welcome to this grow!
The chalk is added to raise the pH of the soil.
The soilmix I use has too low a pH without it.
I know the pottingmix and seedling soil in the mix are around pH 5.
The cocopeat and compost do not really help raising the pH either so I added chalk.
Not really an exact science so I keep a close eye on the plants, and overwater occasionally to take runoffwater to measure pH with.
Not very accurate I agree but it enables me to compare soils I have here, add a bit of experience and there I go....
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