الفهرس 
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Abstract
58 Based upon the importance of micronutrients and biological dinitrogen
fixation(BNF) to soil fertility and sustainable agriculture, the present work aimed at studying the efficiency of N2-fixing bacterial agents (Diazotrophs) under treatments with mixtures (composites) of certain micronutrients, i.e. Mn+Zn+Cu, on plant growth of two major food and feed crops, namely Maize and Faba Bean grown on two different arid soils of Egypt, namely Alluvial and
Calcareous soils. The study was excuted via two separate experiments.
Two different soils were chosen to achieve the purpose of this
investigation, namely alluvial clay loam, of the Experimental Farm, Faculty of
Agriculture, Minufiya University (Shibin El-Kom), and calcareous sandy, of
El-Nobariya, El-Behiera Governorate, Egypt. Maize (Zea mays,
c.v.T.W.C.321), as a summer cereal crop (shallow fibrous rootted plant), for
the first experiment, and faba bean (Vicia faba, c.v. Giza 3 mohassan), as a
winter legume crop (deep tap rootted plant), for the second experiment, were
examined.
The micronutrient additions were considered as a major treatment ″M″ in
this study. Mixtures of sulphate salts of each of Manganese ″Mn″ + Zinc ″Zn″+
Copper ″Cu″, were used as sources of micronutrients for both crops in either
soil. Concentration of each element in the mixture (composite) varied
depending on the interested crop. Two levels of each mixture ″M1<M2″ were
used for each experiment.
The diazotroph inoculations.