الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
This study was carried out at the nursery of Horticulture Department, Faculty of Agriculture, Ain Shames University during two seasons of 2015 and 2016 to study the effect of sowing medium and fertilization rates on vegetative growth and chemical composition of Swietenia macrophylla and Khaya senegalensis seedlings.
Three different sowing media were used i.e. , S M1 = perlite : peat moss: compost(1:1:1) , SM2 = perlite : peat moss : compost(1:2:1) and SM3 = perlite : peat moss : compost ( 1:1:2 ) (v/v). Also, four fertilization rates were used as follow : without fertilizer (control), 5, 10 and 15 g / seedling of hydrocomplex fertilizer.
The following data were recorded, Plant height (cm), stem diameter (cm), compound leaves number / plant, leaflet number / plant, leaf area (cm2 ) root length, fresh and dry weight of roots and total fresh and dry biomass (gm). Moreover, chlorophyll a & b leaves mg /g FW), total carbohydrate content ( mg /g DW), nitrogen, phosphorus, potassium, calcium, magnesium content in leaves (% DW), Zn, Fe, Cu and Mn (p.p.m) were determined.
The obtained results were as follow
Regarding the effect of sowing medium
Using sowing medium which content the highest percentage of compost (1:1:2) significantly increased plant height, stem diameter , number of leaves / plant, number of compound leaves / plant, leaf area, fresh and dry weight of leaves and stems, total fresh and dry biomass, root length, fresh and dry weight of roots, total carbohydrate and potassium leaves content for Swietenia macrophylla seedlings in comparison the other treatments in both seasons with exception of medium content (perlite : peat moss: compost) at percentage of (1:2:1) for root length in the first season and stem length and total carbohydrate in second seasons. Also, differences in chlorophyll a & b, carotine, nitrogen, phosphorus, magnesium, zinc, calcium, copper and manganese leaves content were insignificant. The medium contains equal percentage of perlite : peat moss : compost (1:1:1) significantly increased leaves Fe content in both seasons as compared to other treatments with the exception of medium contains the high ratio of peat moss in second seasons only.
For Khaya senegalensis, both of the medium which contain the high ratio of compost (1:1:2) and high ratio of peat moss(1:2:1) were superior in both seasons as compared the other medium in plant height, stem diameter, number of compound leaves, leaf area , total fresh and dry biomass and leaves carbohydrate content with the exception of total dry weight in the first seasons and leaves number, leaf area, fresh leaves for leaves and stem and root length in second seasons.
Concerning the effect of fertilization rates
For Swietenia macrophylla , using fertilization at the rate of 15 g /plant caused significantly increased plant height, stem diameter , number of leaves / plant, leaf area, total fresh and dry biomass, chlorophyll a & b content, total carbohydrate content, nitrogen, phosphorus and potassium leaves content in comparison the other fertilization rates with the exception of leaf area, chlorophyll a , phosphorus and potassium leaves content at the rate of 10gm/seedling in the second seasons only.
As for khaya senegalensis , application the rate of 15 g / plant resulted significantly increasing in plant height, stem diameter, number of compound leaves, leaves number, roots fresh weight, total fresh and dry weight, root length, chlorophyll a & b leaves content, carbohydrate content, nitrogen, phosphorus, potassium , magnesium, calcium, zinc, and iron leaves content in comparison the other treatments in the two seasons of study with the exception of stem length ,roots dry weight, potassium leaves content at the rate of 10 g/plant in second season only. Also, using the rate of 10 and 15 g / plant caused significantly increased in leaves phosphorus, zinc, calcium and copper content while, there were any significant differences in leaves manganese content at any fertilization rates. Moreover, the control treatments, non-using fertilizer, and the rate of 5 g /plant significantly increased leaves carotene content as compared other fertilization rates with exception of the rate of 10 g/ plant in second season only.
Regarding the interaction between sowing medium and fertilization rates. In general, application of growing medium which contain a high ratio of compost (1:1:2) was superior in all tested characteristics for both species followed by which contain a high ratio of peat moss (1:2:1) at 15 gm fertilization as compared to the other treatments.