Outdoor grow, soil, its a mix made of local outdoor soil and plagron light mix. its my first time growing, Im aware that right ph is essential for proper dissolution of nutrients, but i havent checked it yet since i havent managed to buy a ph meter. i intend to do that asap.
i would like to add that i have other plants near by, planted in the same soil mixture, but they don't show such deficiencies. They were transplanted 2 weeks ago and i havent used much additional nutrients so far.
But you have to get a PPH meter and check the soil ASAP. Don't add nutrients until you know the PH. Doing so can kill your plants in short order if the issue is just PH lockout, and your soil actually had plenty of available nutrients.
The other 2 plants you mention, are they Cannabis, or another plant?
You also said the other plants were transplanted 2 weeks ago, how long has the trouble plant been there?
How often are you watering? How often are you feeding nutes?