الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Maize (Zea mays L.) is one of the most important crops and ranks the third of the most important cereal crops in the world surpassed by wheat and rice. Efforts being done all over the world to improve maize productivity to fulfill the food requirements for an over expanding population. Maize has many uses, which are directly or indirectly in human food, animal feed and an essential ingredient in animal feed and diets, in addition to nutritious, medicinal, and other industrial purposes, so it is known as the queen of grain crops.
In Egypt, Maize is essential for human and livestock consumption as an available source of carbohydrate, oil and slightly for protein. It is required for several industrial purposes such as starch and oil. It is quite important to increase maize production to fill the great gap between the local production and the home consumption of cereals. This fact indicates the important role of maize as a main component in human nutrition. The cultivated area of maize in Egypt during 2020 year is about 2,614,146 fed of which, yellow corn reached 691, 756 fed. The average grain yield fed was about 12.6 ton fed-1 (Bulletin of Agricultural 2020).
The Egyptian policy aims to increase yellow maize production to face the large demand in order to minimize its imports through breeding for high yielding hybrids. Nitrogen is a vital element for maize productivity as well as in many other cereal crops. Nitrogen is without doubt the most spectacular of all essential nutrients in its effect on plant growth. A certain level of N must be present in plant cells for optimum u