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1. The Hydroponic Process
As contained in mineral salts or fertiliser chemicals, these are: nitrogen, phosphorus, potassium, calcium, magnesium, sulphur, iron, manganese, boron, zinc, and copper.
http://www.fun-home-projects.com/hobbies/​hydroponics/​the_hydroponic_process.html

2. Feeding Your Plants
Moreover, as will be explained below, since these commercial grades contain many of the minor elements such as manganese, boron, zinc, and copper as incidental impurities, it is You will notice that the quantities of the individual fertiliser salts vary in each mixture.
http://www.fun-home-projects.com/hobbies/​hydroponics/​feeding_your_plants/​

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January 7, 2009