erabium forest is 15 km. far from Ismailia City at the Northern East of Egypt, which had 25 years old, irrigated by treated wastewater.The Serabium forest (129 ha) was realized using different tree species a high wood production. The study was carried out from 2009 to 2013 on four years old of Corymbia citriodora Hook. and Cupressus sempervirens L. trees planted at 3 х 3 m. spacing and irrigated by drip irrigation system of primary treated wastewater to compare the growth and wood prduction of two species. The results revaled that, the growth of two tree species increased gradually through 5-year affected by treated wastewater. Corymbia citriodora had tallest significant trees and biomass as compared to Cupressus sempervirens. The results also showed that, Corymbia citriodora trees gave the highest significant annual rate increment of basal area in 2010 (39.03 cm² tree1) followed by Cupressus sempervirens (25.24 cm² tree1). Although, Cupressus sempervirens had the highest tree volume at 2009 as compared to C. citriodora (12283.6 and 4612.6 cm³ tree1), respectively. C. citriodora showed the highest significant tree volume in 2012 and 2013. At the end of the experiment, Corymbia citriodora gave the highest values of total volume per hectare followed by Cupressus sempervirens (79.43 and 49.18 m³ hā ¹), respectively. It could be concluded that, Corymbia citriodora gave the best growth performance followed by Cupressus sempervirens, which makes these species a valuable in many reforestation programs, especially Corymbia citriodora for shortcut rotation and Cupressus sempervirens for long cut rotation.

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In this investigate conducted during period of 2008 to 2011 to study the effect of NPK fertilizer on annual increment rate for growth of Swietenia mahagoni, Fam. Meliaceae. The trees were at the age seven years old, which have been planted at a distance of 3mx3m in new reclaimed land, north west of Cairo, Egypt, at the Experimental Farm of Aly Moubarak Hort. Res. Inst. Agric. Res. Center (ARC). They were fertilized with ammonium sulphate (15.5% N) at the rates of N1 = 0.0, N2 = 51.61 and N3 = 103.22 g, superphosphate (40-46% P2O5) at the rates of P1 = 0.0, P2 = 64.51 and P3 = 129.03 g and potassium sulphate (50% K2O) at the rates of K1 = 0.0, K2 = 16.00 and K3 = 32.00 g all per tree, which they were 27 treatments. The best treatments which were more effective in annual rate increment for height (ARIH) were K1N2P3 and K2N2P1 (88.333 and 83.333 cm) in the first year and K3N1P3 (83.333 cm) in the second year of fertilization. The treatment of K3N2P2 caused the high value of annual rate increment for diameter at breast height (ARIDBH) which was (3.040 cm) and high value of annual rate increment for Basal area (ARIBA) which was (56.970 cm 2) in the first year of fertilization, while, in the second one K2N3P3 treatment produced high value of BAAI (56.843 cm 2). However, in the third year of fertilization there was no significant effect of NPK fertilizers on the previous measurements, in addition to in many treatments fertilization lead to an adverse effect on these measurements.

Evaluation of biomass and some physical and chemical properties of Dendrocalamus stricus 6-year-old (Barkley et al) grown under sewage water in Sarabuim Ismailia Governorate were conducted during the season of 2009. It is shown from data that, plants where cut has weight of 3.622 kg then weight decreased to 1.203 kg after 100days from cutting. Also culm diameter decreased from 2.446 cm to 2.075 cm after 80 days from cutting. It is observed that NPK differed from group to other, the group C (culm diameter more than 4 cm) has the highest content of nitrogen while, P and K are less than the group which their plants culm less than 0.4 cm. Wood extracts, cellulose and lignin are increased with increasing plant culm diameter. So the group C (culm diameter more than 4 cm) has the largest amount of cellulose, lignin and fiber length (77.437%, 81.197% and 1.85 mm), respectively. Also group C (culm diameter more than 4 cm) has the largest content of heavy metal (Ni, Cd and Pb) 121.83, 8.160 and 50.773 mg/100 g., respectively. Branches number and their weight increased from group A (culm diameter less than 3 cm) to group C (culm diameter more than 4 cm) (culm diameter is above 4 cm) and group B (culm diameter 3-4 cm) in between.

The present study was conducted during 2012 and 2013 in Serabium forest. The aim of this study was to estimate tree biomass and some wood mechanical properties of Cupressus sempervirens L and Corymbia citriodora Hook. The results showed that C. citriodora was superior over C. sempervirens for most of biomass parameters (total and merchantable height, total volume, green and dry weight and total above-ground biomass) at the age of 5 and 7 years. However, the increment percentage of biomass from 5 to 7 years of age was higher in C. sempervirens than C. citriodora. Mechanical properties obtained from the static bending test, Modulus of Elasticity (MOE), Modulus of rupture (MOR), and Tensile strength recorded higher mean values as the trees get older while they recorded lower mean values from base to top within the tree for both species. Mean values of MOE, MOR and Ten.st. for C. sempervirens at age of 7 years old at DBH were 8128.5, 83.0 and 64.4 N/mm 2 ; respectively, while, these values were 15503.5, 158.8 and 149.0 N/mm 2 ; respectively for C. citriodora. These results revealed that, wood mechanical properties for C. citriodora were higher than C. sempervirens.