1st grow - CFL fridge grow - NL auto

Start of week 7, nothing new to report. Now its in full flower mode think I'll stop alternating nutes and ph'd water and just stick with nutes every water. Still using 2ml/l of grow nutes, will start reducing that this week. Went up to 3ml/l of flower nutes. Still watering every 2nd day with a litre of fluid. Few more of the lower leaves are starting to yellow and shrivel up, think it's a combination of getting no light and flowering. If anyone has any advice fire away, I've added some pics. There are 5 in total, all at the bottom but those are the worst 3. Day 45 - thanks for the answers to the question folks. Think it's a mixture of everything that folk were saying. Will keep the grow nutes the same quantity and start using nutes every water. Will know by end of week how it does. The uppermost leaves at the flowers are starting to get frosty from trichomes. Looking forward to how it progresses this week. Day 47 - not checked since day 45 and noticed an apparent difference in the flowers. They're certainly gaining some weight. All 3 waters this week have been with nutes, will keep the grow nutes the same level as the plant obviously needs it and will start reducing them closer to harvest before flushing. Don't think it's going to be too long as some of the pistils are changing colour already, this might be a usual occurrence, not too sure Day 49 - end of week 7. I think from doing a bit of digging that I've a slight phosphorous deficiency. The dark splotches on the leaves seem to be a bit of a giveaway for that. Watered for the last time this week so upped my flower nutes to 4ml/l and will keep the grow at 2ml/l, maybe reduce to 1ml/l over the next week. Apart from that the plants doing well, really pleased with it so far. Will keep a close eye next week to make sure the deficiency doesn't turn into a problem. Hoping that adding nutes every water will help me out