author(s)
Israa H Kareem, Ahmed S Bahauldin and Azheen O Mohammed

abstract
Because comparable research on the impact of humic acid on the concentration of certain nutrients has not been conducted in Iraq, vegetative growth, and yield characteristics, and due to the climate of Iraq that is suitable for growing citrus fruits and obtaining good quality fruits, and due to the increase in the proportion of population in Iraq and the world, and the increase in consumer requirements for citrus fruits due to their high content of vitamins. The vegetative and flowering parts of citrus fruits are the finest types of essential oils: Limonine, which is used in the manufacture of perfumes, foodstuffs, and soap. This study aims to collect previous studies on citrus seedlings and trees.