Una Weeda Tira l'Altra

I've fed the plant just twice at the moment due to the absence of any measuring tool, I should definitely go and buy something like that :( Lower leaves started turning yellow, I guess that's the lack of nitrogen, I'll post detailed pics of these leaves. Tell me what you think guys:) Details about this first flowering week: 7/12 HEIGHT: 41.0 cm INTERNODES: 10 HUMIDITY (MAX/MIN): 85% / 42% TEMPERATURE (MAX/MIN): 31,5°C / 19,7°C 8/12 (MISSING) 9/12 (MISSING) 10/12 (MISSING) 11/12 HEIGHT: 47,0 cm INTERNODES: 12 HUMIDITY (MAX/MIN): 87% / 38% TEMPERATURE (MAX/MIN): 33,4°C / 20,1°C 12/12 HEIGHT: INTERNODES: HUMIDITY (MAX/MIN): TEMPERATURE (MAX/MIN): 13/12 HEIGHT: INTERNODES: HUMIDITY (MAX/MIN): TEMPERATURE (MAX/MIN):