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Abstract
1. INTRODUCTION
Onion (Allium cepa, L.) is one of the foremost alliaceous vegetable plants, and one of the most important field crops for export and local consumption it has been used for flavouring, salads, sausages, soups and is also of a medical valued due to its high contents of carbohydrates, proteins, vitamins, minerals and antioxidant substance.
Onion is a biennial crop in the first growing season, bulbs are formed, but in the second one, bulbs are utilized to produce seeds. Onion is widely cultivated in multifarious countries and considered one of the principle field crops grown in Egypt. Moreover, beside its importance for local consumption, it has great potentiality as export commodity to some European markets. According to the statistic of 2002 in Egypt the average annual bulbs production from an area of 54012 fed. was 628376 tons.
Organic and bio-fertilizers are very important sources for providing the plants with their nutritional requirements without having an undesirable impact on the environment.
Nitrogen nutrition has been known in affect growth and yield potential of field crops. Nitrogen as an essential element was found to be involved in amino acids chlorophylls and auxins metabolism as well as enzymes and protein synthesis.
Bio-fertilizers which can be more appropriately called microbial inoculants are preparations contain living strains of organisms applied to soil seeds and/or compost with the objective of increasing the number of such microorganisms and accelerate certain microbial processes.