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Abstract
Two field experiments were conducted during 2008/2009 and 2009/2010 seasons at Sakha Agricultural Research Station, Kafer El-Sheikh, Governorate, Egypt, to study the effect of phosphorus treatments: 30 kg P2O5 and 300 and 600g/fed of phosphorin, Bucillus megatherium (phosphate dissolving bacteria) and nitrogen treatments: 100 kg N/fed, Azotobacter chroococcum +60 or 80 kg N/fed, Azospirillum brasilense + 60 or 80 kg N/fed, Azoto. + Azosp. + 60 or 80 kg N/fed on yield and quality traits of sugar beet. Azotobacter chroococcum and Azospirillum brasilense were used at the rate of 300g/fed. A split plot design with four replications was used with P treatments in the main plots and N treatments in the sub plots. Results revealed that application of 30 kg P2O5/fed produced the highest LAI, root diameter, root length, root, top and, plant fresh weight and plant dry weight, as well as yields of roots, sugar and tops and juice quality traits in terms of TSS%, sucrose%, purity%, and recoverable sugar %, followed by phosphorin at the rate of 600 and 300 g/fed in a descending order. On the other hand biophosphatic fertilizer decreased sucrose loss to molasses. Application of 100 kg mineral N/fed produced the highest growth traits followed by Azoto. + Azosp. with 80 kg N/fed. The highest values of TSS%, sucrose%, and recoverable sugar resulted from either Azoto. or Azosp.+ 60kgN/fed. Increasing N rates from 60 to 80 kg/fed in combination with N fixing bacteria depressed beet quality and increased impurities in beet roots