الفهرس 
MATERIALS AND METHODSOnly 14 pages are availabe for public view
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Abstract
This study was performed in the lath house of the Experiment
Farm, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheim Egypt in the two successive
seasons of 2013 and 2014 to determine t effect of foliar spray with magnetite nanoparticles (MNPs)
as nutrie supplement on some growth parameters and chemical components orange saplings (Citrus
sinensis L) Valencia cultivar., grape saplings (vit vinifera L) Flame seedless cultivar., and pear
saplings (Pyrus serotina X Pyrus communis L.) Le-Conte cultivar.
The major parameters of vegetative growth, leaf content of N and Fe (ppm), leaf pigments content,
leaf content of total carbohydrates and total amino acids.
The protocol used in the preparation of nanoscale iron particl after the characterization and
identification of nanoparticles, concluded that iron is present in the form of Magnetite
nanoparticl (Fe3O4).
Results showed that application of MNPs gave the highe significant values of plant height,
leaf area per sapling and fresh & d weight of sapling in both seasons. Additionally, plant
chemicals showed tremendous increase for the values of leaf pigments content compar with foliar
spray with iron chelated and control treatment. Also MN was the most effective treatment in
increasing the tested chlorophyll-a a chlorophyll-b, total chlorophyll and carotenoids content in
both studi seasons. Application of MNPs gave the maximum increase for le nitrogen and
iron content in both seasons. Also increased leaf tot carbohydrates and amino acids content
of saplings comparing with oth treatments in the two studied seasons
Application of MNPs at 125 ppm and 250 ppm gave the best
effect on parameter of orange, grape and pear saplings.
MNPs proved to have unique physicochemical properties and superparamagnetism that boosted over all
plant metabolism that affected by biomass and bio-chemical properties.