Influence of Site factors and Chemical fertilizers on growth of Paulownia tomentosa Seedlings in Shaqlawah-Erbil

Across the globe, urban centers and farms are expanding, often at the cost of natural forest systems, which are also the hivictims of an increasing demand for timber. The loss of these systems causes severe damage to region’s ecosystem: soil erosion increases while soil moisture capacity and atmospheric humidity decrease The Paulownia tree provides a unique and ideal solution to this problem. It is a fast-growing, readily sustainable hardwood requiring minimal management and very little investment. Harvesting begins within 8-10 years and can continue yearly for as long as is desired, since new shoots grow from the stumps of felled trees. This study aimed to check the comparable effect between chemical fertilizer NPK and Potassium sulphate KS in comparable with control on growth traits of Paulownia tomentosa seedlings. the experiment conducted in shaqlawah town which belong to erbil 50 km to the north in the north face of safeen mountain. during may 2022 to April 2023. The experiment designed according to RCBD full factorial, two fertilizers used KS 30g. and NPK 30g. three times per one year every four months with control no fertilize treat. the biometric traits height and diameter measured three times after (4 ,8, 12) months of planting. The leaf chemical analysis were done two times after (6, 12) months of planting for NPK conc. In leaf samples, even the soil chemical and physical analysis did for the field soil before planting. The climatic factors measured by the ministry of Agriculture between may 2022 to April 2023. The results show highly significance effect of site factors conditions (temperature light and precipitation) on biometric growth of seedlings were p value ≤0.05 during the experiment with increment 89.2 cm in height of seedling and increment (5.7) mm in diameter.