الفهرس 
Increasing Yield of Some Economic Crops Under Organic Agricultural Conditions
AbstractOnly 14 pages are availabe for public view
 |  | from | 154 |  |  |
| | | from | 154 | | |
Abstract
The objective of this work was to study the support of vegetative growth, productivity and quality of common bean (Phaseolus vulgaris L.) cultivar ”Polista” and potato (Solanum tuberosum) cultivar ”Diamount” grown using inocula of bacterial endophyta, alone or with Rhizobium sp. (for legume crops). In this study, the field experiment was carried out during the two growing seasons of 2016 and 2017 at the ”Bio-Egypt” farm in Qalyubia – Governorate-Egypt.
The examined endophytic bacterial strains isolated and characterized in a previous work were conclusively identified using 16S rDNA gene sequence analysis asAzotobacter vinelandii ,Bacillus subtilis , Rhizobium phaseoli and Azospirillum lipoferum .These isolates showed ability invitro to produce plant growth promoting substances as ammonia (NH3), hydrogen cyanide (HCN), as well as the ability to fix nitrogen, dissolve phosphate and poly-β-hydroxybutyrate (PHB) along with their intrinsic antibiotic resistance. Plant growth promoting ability of these bacteria was evaluated in field experiments.
The results showed that the integrated use of biofertilizers increased the plant height, number of stems, total chlorophylland chemical composition of potato tubers also specific gravity, carbohydrate and protein content and total phenol in potato. When inoculated with Azotobacter sp., Azospirillum sp., Bacillus sp. and compost extract (P16) and Azotobacter sp., Azospirillum sp. and compost extract (P13), the highest total yield from potato (14.4 – 14.7 ton/fed) was obtained in season 1 and season 2, respectively. On the other hand, inoculation of common bean with Rhizobium sp., Azotobacter sp., Azospirillum sp. and compost extract (Ph14) increased total yield up to (22.85 – 25.38 kg/fed) in the two seasons. Results referred a possible role of the isolated endophytes, as inocula, in improving commonbean and potato growth and productivity