الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This work was carried out during two seasons of 2012/2013 and 2013/2014 in the agricultural research center in El Khassasen .The aim of the present study was to investigate the effect of arbuscular mycorrhizal (AM) fungi inoculation with NPK fertilizer or sewage sludge on the growth traits of Swieteina mahogani, seedlings. The AM fungi were used as a mixed culture from species of Glomus mosseae, G. etunicatum and G. clarum. The factorial pot experiment was designed in six NPK fertilizer ratios (00:00:00, 00:10:05, 05:10:05, 10:05:05, 05:05:05 and 05:00:05) with four levels of AM fungi spores plant-1 (zero, 150, 300 and 450±10) . Also six additions of sewage sludge (zero,250.500,750,1000 and 1250g) with four levels of AM fungi spores plant-1 (zero, 150, 300 and 450±10). The results shown that, the maximum values in all plant growth parameters were recorded in the plant treated with NPK at ratio 10:05:05 with AM fungi inoculation rate300, 450 spores/ plant and NPK % in plants leaves was obtained from NPK at ratio 10:05:05 with450spores/plant of AM fungi inoculation. Also the maximum amount of plant chlorophyll a, chlorophyll b and carotenoids were found at plants treated with AM fungi by rate 450 spores/ plant and NPK ratios 10:05:05. The biggest rate of dry weight/fresh weight and the quality index of seedling recorded from 10:5:5 ratio and450spores /plant of Am fungi. Also The numbers of AM fungi spores were increased at NPK fertilization ratio 0:10:05 with all inoculation levels. The results shown that, the maximum values in all plant growth parameters were recorded in the plant treated with 500g sewage sludge with AM fungi inoculation rate300, 450 spores/ plant and NPK % in plants leaves was obtained from 500g with 300 and450spores/plant of AM fungi inoculation. The maximum amount of plant chlorophyll a, chlorophyll b and carotenoids were found at plants treated with AM fungi by rate 300 spores/ plant with 500g sewage sludge. The biggest rate of dry weight/fresh weight and the quality index of seedling recorded from 500g sewage sludge and300 spores /plant of Am fungi . The addition of AM fungi to NPK fertilization or sewage sludge had better growth effect by increased NPK uptake when comparison between treatments. This is due to the mutual positive action of S. mahagoni and AM fungi species that helped to absorb more NPK fertilization from soil. On the basis of results it can be concluded that at this practice can be exploited for commercial production of S. mahagoni.
Key Words: Woody trees, AM fungi, Bio-fertilization, Mahogany, NPK.