Northern Lights Auto - First Grow

The smell is getting stronger, but I would still describe it as weak. The lack of odour is the main thing which attracted me to this strain as my first grow, as I'm growing in an apartment :). So far, it's been very beginner friendly. It seems all vertical growth has stopped and the bud sites are slowly fattening up. At the rate it's going, I don't think the yield will be too impressive, but I'm happy to get anything out of it for my first time. I will be going on vacation in about 4 weeks, so no matter what it will need to be chopped down and dried before I leave, but I can thankfully cure on vacation. Trichomes are now a mixture of cloudy/clear and I would say ~40% of all the pistils have browned. Also, some of the lower leaves are beginning to become yellow and dry. I understand that this happens prior to harvest, but I feel this may be a nutrient deficiency as I've been only been feeding around 120 ppm of nitrogen the last few weeks and a proper harvest is still far away.