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دانلود رایگان کتاب Hydroponics

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دانلود رایگان کتاب کشاورزی  Hydroponics

Free download : Hydroponics

Further, continuous cultivation of crops has resulted in poor soil fertility, which in turn has reduced the opportunities for natural soil fertility build up by microbes . This situation has lead to poor yield and quality .
In addition, conventional crop growing in soil is difficult as it
involves large space, lot of labour and large volume of water. And in some places like
metropolitan areas, soil is not available for crop growing. Another serious problem experienced since of  late is the dif ficulty to hire labour for conventional open field agriculture.

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