الفهرس 
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Abstract
Field experiment was carried out at Desert Research Center at Ras
Suder, South Sinai Governorate, Egypt during 2010 and 2011 seasons, on
tomato plants (Lycopersicon esculentum Mill) cv. Castlrock. This work
aimed to determine the effects of magnetic treatments of both pre-sowing
seeds and irrigation water and its relevance to NPK fertilizer requirements
of tomato plants. The experimental design was split-split plot with three
replicates. Irrigation treatments (magnetized and ordinary water) were
arranged in the main plots, pre-sowing treatments (magnetized and
untreated seeds) were distributed in the sup-plots and three NPK levels
(50, 75 and100% of recommended rate) were assigned in the sub-sub
plots. In general, the best results for plant and soil were obtained by
magnetic field techniques either for presowing seeds or irrigation water.
However, the incorporated treatment (plants originated from magnetically
treated seeds and irrigated with magnetized water) tended to be more
effective for enhancing the plant and soil characteristics during various
plant stages. The interaction treatment of magnetically treated seed and
irrigation water combined with 100% or 75% NPK fertilizer levels had a
preference results, where it gave the highest values of vegetative growth
characters, increased the N, P, K, Ca, Fe, Ec values and Na soil content
but reduced S, Cl and pH value in both plant and soil solution, in addition
to improving the activity of CAT and POD enzymes. Finally we
emphasized that the techniques of magnetic field in agriculture fields
could be a promising technique for agricultural improvements but
extensive research is still required.