Promoting undifferentiated cell proliferation in the central zone of shoot apical meristem. The continuous cell multiplication will become the input for differentiated tissues (stem, leaf, branch and inflorescence) development
By adding fertilizing substances such as plant organic matter to the all-important growth medium. Such organic materials [matter] add Humus to Soil and - 'the more the blacker'.
well simply what helps it increase is good circulation in the root zone. sry i dont know what decreases it but i have been told that what decreases it is rock or hard metal music but the vibrations...