ok there can be a few variables in this one i checked the plant today haven't visited it in 10 days.
On the last visit i upped the P and K probably a bad decision (still in veg) and this has resulted in the lower fan leaves turning yellowish.
I added more N today hopefully that will fix it. The only other thing that could have done this was the heat wave we had in the last two days also i dont water as much i let the water storage crystals do the work.
Please help
Heres the pics, the plant is just over one meter tall
Use water crystals as back up, not to be relied upon for any extended period of time.
10 days between watering is too long. 4 or 5 days at the most, Less water means smaller plant, smaller yeild.
higher P and K is good from now onwards. dont forget plant need N too!
On really hot days (40oC +), 1 big water in morning, one at mid day and one in the evening.
Fertilise every 3-5 days, stop fertilising 3-4 weeks before expected harvest