ive taken the time to link you to the first results of a google search.
In print and online, Maximum Yield is your source for cannabis and cultivation knowledge, with informative grow articles and tips to enhance your life with mmj.
www.maximumyield.com
this is the guy who wrote it: Rich Hamilton, has been in the hydroponics industry for more than 20 years, working originally as a general manager in a hydroponics retail outlet before becoming an account manager at
Century Growsystems. He enjoys working on a daily basis with shop owners, manufacturers, distributors, and end users to develop premium products.
if you need articles from scientific journals ill look them up for you.