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Abstract
Three field experiments were conducted during 2002 / 2003 and 2003 / 2004 at Aladlia farm, in Belbais county, Sharkia Governorate, to study the effect of organic, bioorganic, and mineral fertilization on potato.
I-Organic fertilizers .
II-bio-organic fertilizers.
III-mineral fertilizers 1- Organic fertilizers -Three sources of orhanic manures were manures were studied comost ( treated farm manure) chicken and cattle manures -three sources of bio -organic fertilizers were added at the rates of Of 90, 120 and 180Kg nitrogen feddan .11-Bio-organic fartilizers - three souces of bio-organic fartilizars were used : - Bio-compost compost with Bio fertilizers) Bio-cattle manure cattle manure+ bio- fertilizers and Bio poltery manure ( chicken manure+ Bio ferthlizers) .these fertilizers were added by rates of 90 120 nitrogen /feddan