تأثير التسميد باليوريا والرش بحامض الهيوميك Humic Acid في نمو الخضري لأشجار الليمون الحامض المحلي Citrus lemon

Abstract

This study was carried out in the orchard of horticulture and landscape design department - College of Agriculture - University of Kirkuk - Iraq during The period Sep. 2017 to Jul. 2018 to study effect of urea fertilizing with three levels (0 , 50 and 100) g.tree-1 and humic acid spraying with three levels (0 , 2 and 4)g.L-1 on some growth characteristics of lemon seedlings. The results in this experiment could be summarized as:1-The 50g.tree-1 of urea had significant increase on all the growth characteristics 2-The 4g.L-1 of humic acid led to significant increase on ( plant height, number of leaves and branches, branches height and diameter, leaf area and chlorophyll content) and the 2 and 4 g.L-1 hasn’t have significant increase in stem diameter.3-The interaction of treatments had significant increase in 50g.tree-1 urea and 4g.L-1 humic acid on all studded characteristics.