Originally Posted by bullebulle
Damn. I just watered today without nutrients. From now on I start using nutrients on every watering.
I also ordered PH drop tester today. However, I keep water standing atleast one day at watering can, but maybe it's not enough?
Are you saying my pot are too small? It is 11 litre fabric pot...
Nah, that's a fine size. The perspective made it seem a little smaller. You may find that you only need to feed 3 out of 4 waterings or something, it will all depend on the rhythm of the plant and how it responds to extra ions. I would feed twice in a row in the short-term though. As you realize, some non-feed waterings are important for maintaining a healthy soil and not congesting the root zone.
Letting your water stand before applying will mainly bring it to room temperature and allow gasses to sublimate. This includes oxygen, unfortunately. A $15 aquarium pump and aerator will solve that issue.
When you add nutrients, the pH can get really imbalanced, depending on whether you've got lots of anions or cations in the mix. That's where your pH testing is going to really make a difference. You may find that it isn't so much that you're underfeeding but that you're feeding at a pH that doesn't allow optimal uptake of ions by the plant.
Looks like you just need a couple of tweaks and you'll be killing it.