berikut membahas tentang masalah pupuk berikut manfaat dan kegunaanya:
www.anneahira.com/macam-macam-pupuk.htm
http://pupukplus.blogspot.com/
http://thikalagi.blogspot.com/2009/04/pupuk-itu.html
http://pusri.wordpress.com/2007/10/01/khasiat-unsur-hara-bagi-tanaman/
http://epetani.deptan.go.id/node/kontroversi-seputar-pupuk-pemupukan-tanaman-1555
http://kasmadi-kasmadi.blogspot.com/2010/05/kandungan-manfaat-pupuk-npk.html
http://www.petrokimia-gresik.com/phonska.asp
www.anneahira.com/macam-macam-pupuk.htm
http://pupukplus.blogspot.com/
http://thikalagi.blogspot.com/2009/04/pupuk-itu.html
http://pusri.wordpress.com/2007/10/01/khasiat-unsur-hara-bagi-tanaman/
http://epetani.deptan.go.id/node/kontroversi-seputar-pupuk-pemupukan-tanaman-1555
http://kasmadi-kasmadi.blogspot.com/2010/05/kandungan-manfaat-pupuk-npk.html
http://www.petrokimia-gresik.com/phonska.asp
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