ok, I think I got ot figured out now.

Plants need higher levels of "N" and "K" and less levels of "P" during grow phase.

Plants like a light dip in "N" and "K" and a boost of "P" during flowering.

If you notice the N-P-K rating on your nutrient bottles, you'll see the difference between the grow and bloom bottles, and it should be similar to what I described above with the boost and dip between the two.

So................ following the attatched pH to nutrient uptake chart, I've deduced that during growth stage, I will keep the pH between 5.5 and 5.8, and during the bloom phase between 5.8 and 6.1.

This should provide the optimum conditions and nutrient uptake.

Look at the chart, It tells all about nutrients and pH. For example, if your pH is below 5.8, you won't be getting any potassium to your plants which is essential, especially during flowering. Magnesium only uptakes in low pH environments like 5.5-5.6, which is important in growth phase and flowering.
In my resevoir, which is only 5 gallons, I have the best results by keeping pH between 5.6 and 6.1. But now I have figured out when to keep it closer to the high side or low side.

Low side during grow (5.6-5.8)
high side during bloom (5.8-6.1)

Everyone get a pH monitor by American Marine (Pinpoint)!!!!!!!!!!!!!
you can fine tune your pH effortlessly and worry-free
Stormcooker Reviewed by Stormcooker on . pH plan of attack ok, I think I got ot figured out now. Plants need higher levels of "N" and "K" and less levels of "P" during grow phase. Plants like a light dip in "N" and "K" and a boost of "P" during flowering. If you notice the N-P-K rating on your nutrient bottles, you'll see the difference between the grow and bloom bottles, and it should be similar to what I described above with the boost and dip between the two. So................ following the attatched pH to nutrient uptake chart, I've Rating: 5