I have a open question... This is my third crop. The first one I did the yield was great, but the second (same amount of plants, strain the same) did not have as great a yield. The current crop some plants are more dense with buds than the others. What could be causing this?
There are a lot of factors that could be causing this and we don't have enough info to really help. Light, temp, ventilation, humidity, nutrients, feeding schedule, bugs, etc can all cause variations in yields. Look for differences in your grown. Something as simple as letting your plant dry out for to long between watering at a key time of growth can stunt it.