my babes are two weeks into flowering and I have two questions. 1. some of the leaves near the bottom are gaining yellow tint...? 2. what a cheap and efficient way to put more nitrogen in the room??
The fan leaves very near the bottom should be yellowing and falling off as the plant ages. Pics would help so we could look for a problem. For your #2 question, try asking in the Advanced Cultivation room if you don't get an answer here.
I'm just assuming a soil grow since you didn't say. The cheapest source of nitrogen for plants that I know of is your own urine (yes, it's safe for you); another cheap source would be used coffee grounds (if you don't drink coffee get 'em from your local Starbucks); rabbit manure can be used and directly put on the soil without composting. If you have a few bucks and just want to go to the store - blood meal.