Title: Partial Substitution of Mineral Nitrogen Fertilizers by Bio-Fertilizer to Alleviate the Possible Risks of Chemical Pollution for Broccoli Plants
Abstract: FIELD experiment was conducted on a clayey soil at Sonnuris district, El-Fayoum Governorate, Egypt during the two successive seasons of 2010-2011 and 2011-2012 to evaluate the response of vegetative growth, nutritional status and yield of broccoli (Brassica oleracea L. var. Italica) as well as head quality to a partial substitution of 50% and 25% N-mineral from the recommended fertilizer rate by the N-bio-fertilizer, Azotobacter chroococcum (AT)and Azospirillium brasilense (AZ)[1:1] at one or two or three doses as compared with applying 100 % recommended dose of N-mineral fertilizer (120 kg N fed-1), hopping an alleviation of the possible reduces of chemical pollution for broccoli yield and environmental risks.