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Confused about using of gravel and sand in hydroponics

Date: 20 Sep 2016   Posted By: sanathoi wahengbam     Group: Science and Technology    Category: Science   

Soil as we know is a part of earth's crust where plant grows and it contains plant nutrients for the growth of the plants. Gravel and sand is a part of soil. How we can say hydroponics culture as soil-less plant culture?
Soil contain all the macro and micro nutrients necessary for a plant to grow. Soil also contains the eco-friendly micro organisms which in turn provide the necessary method for the conversion of one molecule to another. How can gravel can act as an anti soil method for hydroponics?
awaiting response.

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