Autoflowering indoor from Argentina

@leitogrowARG, The point is not if it hurts or it does not. Each & every element the plant needs (N-P-K-CA-MG-IR-etc...) both macro & micro are best absorbed by the plant in a specific PH range. The problem is that each element has its own absorption-range and gets locked out of the plant (can't be taken in) outside a certain PH level. To clarify the importance and effect of this I make an example. Calcium is absorbed best in the soil at a ph level of 6.5-9.1 and gets locked out of soil growing at ph levels of 2.0- 6.4. If your soil has a PH constantly below 6.4 your plants are going to suffer a Calcium deficiency (which is very bad considered that after N, Ca is the element these babes use more) which will be disguised by the Magnesium deficiency the plant will show too, as Magnesium gets locked out the very same range as Calcium! NB: these values are for Soil & Soil-mixes growth - they differ in Soil-less mediums! In this example, you'll find yourself with a plant showing confusing deficiencies when you are well aware you gave 'em everything they need. And adding Ca & Mg won't help eighter! Because they're not missing, they're locked out. This is why plants should be watered abundantly and then left to dry out, as while drying the soil (which has a buffering capability) gets more and more alkaline. So that during a wet-dry cycle, your plant has a more acidic soil in the beginning and absorbs all the elements which love a lower PH, while getting dryer and dryer the PH will rise and meanwhile the plant takes in all nutes it needs. To make it easier, (for Soil or Soil-mixes only) a PH between 6.5-7.0 is best. I'd advise against a higher than 7.0 PH for soil growth. To be precise I'm talking about the Soil PH and not the solution's one. You can use the "saturated soil" method to get a fairly precise approximation of your soil's PH and then go from there. I would also say that looking at your pics, these plants look overwatered to me...I see them droop and wilt, which generally are signs of overwatering. Obviously is your call to make a diagnosis, as I talk with knowledge and few pictures only...you have your girls at touch distance every day. GL! I'll follow along if you don't mind ;) DG

@DaGroa, Hi ! Thanks for the tips. The pH 6 is irrigation water that I use. I will increase it progressively until it reaches 6.5-6.8 pH in bloom. Will it hurt to drastically raise irrigation pH to the crop?