They are light intensity, pruning or training, nutrients, climate issues, and the harvest time.
An excellent product such as Marijuana Booster, will give your plant plenty and a variety of nutrients it needs and this can substantially make a difference in your yield.More than anything, the genetics of your marijuana plant are going to have the greatest effect on the final yield.
The physical development of your plant could be hampered by branches interlocking from untidy, uneven growth.
This makes your plant grow outwards in a thick bush.
Consider the "screen of green" (ScrOG) method where a grid of string guides the plants towards neater growth.Increasing light intensityYou will know your plants are having an issue with the intensity of the light by the way they are growing.
This can lead to large spaces on the stem between nodes and leaves, or perhaps even growing tall enough to fall over.Tall, lanky plants are not the type of plants that are going to get you a high yield – bushier plants will.