Improving Mandarin Productivity and Quality by Using Mineral and Bio-Fertilization

摘要

The present study was conducted during the two growing seasons 2009 and 2010 in Agwa farm, in Deby Rasheed , El Behera governorate to investigate the effect of using two sources of nitrogen and phosphorous; the first is the mineral fertilizers ammonium nitrate and calcium supper phosphate, and the second is the bio-fertilizers Nitrobin and Phosohorin, applied either alone or in combinations to different mandarin trees cultivars; -Balady, Clementine and Chinese (Emperor), on the tree growth, leaf mineral contents and fruit quality. Obtained results indicated that, the Balady fruits had the highest leaf potassium and acidity content and higher leaf nitrogen as compared with Clementine, Furthermore. Clementine had the highest total soluble solids content. Meanwhile, the highest vitamin C content occurred in the Chinese variety. Additionally, leaf phosphorous, potassium, as well as fruit acidity contents in the three mandarin varieties increased only by applying 500 g mineral P plus 100 g Phosphorin..In addition, a significant increase in fruit total soluble solids was obtained by applying 300g Nitrobin. Furthermore, the treatment; 500 g mineral P plus 100 g Phosphorin and 250g mineral P + 200g Phosphorin increased fruit diameter . 750 mineral N plus200g Nitrobin increased fruit length .Moreover, 750mineral N plus 200g Nitrobin and 300g Nitrobin showed an increase in leaf nitrogen as compared with 1500 g mineral N plus lOOg Nitrobin in the first season.