pics 1 and 2---> soil is very dry on this plant... altho it looks pretty good... I am having yellowing at the bottom... mainly on growth coming in.. can someone help me on this??

pics 3 and 4----> another decent sized lady about 5 weeks old on week 2 of FF schedule feeding... again yellowing and dying of bottom leaves.. this is becoming very frustrating!! ANY ADVICE VERY MUCH APPRECIATED!