Sustainable Agriculture:

http://www.digmnl.com/health-and-beauty/grow-your-own-food-a-quick-guide-to-urban-farming

Soil-less agriculture is a method that plants grow with out soil. Instead of soil the rout of plants are located in water with enough nutrient or in gravel or sand that use same water. This kind of cultivating is sustainable because it uses low amount of water to compare with cultivating in soil. Furthermore the water stayes in this system and it can be used over and over. The light, humidity and temperature can be controlled in indoor spaces. This could be effective especially in areas that the condition for cultivate is not suitable. This system also have some problems.Plants can catch some sort of disease because of water.Furthermore to provide this kind of cultivate in large scale the cost will not be efficient. However this method have some problems because it could help to grow different plants in different climate with low amount of water. Also it could be more efficient if farmer use sunlight instead of artificial lights.

http://www.greenprophet.com/2010/05/aerofarms-vertical-farming/

 



 Source:
 Benton,J 2012,Hydroponics: A Practical Guide for the Soilless Grower, CRC press.
https://www.youtube.com/watch?v=PSS5mFjwLtI