الفهرس 
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Abstract
Two field experiments were carried out at El-Bramoon Agricultural Research farm of
Mansoura Horticultural Research station, during the two successive summer seasons of 2011
and 2012 on sweet potato (Ipomoea batatas, L.) plants cv. Beauregard. The aim of this study
was to study the effect of foliar spray of calcium at (0, 1000 ppm and 2000 ppm), potassium
fertilization at (0, 48, 72 kg K2O/fed.), and foliar spray of antioxidants (control, ascorbic acid at
200 ppm and salicylic acid at 200 ppm) on plant growth, yield and its components, tuber root
characters, some chemical constituents of tuber roots, as well as quality of tuber roots during
storage period. The obtained results showed that foliar spray of only 2000 ppm of calcium or
with the interaction among 1000 ppm of calcium, potassium fertilization at 72 kg K2O/fed. and
foliar spray of antioxidants as ascorbic acid at 200 ppm or salicylic acid at 200 ppm recorded
the highest values of the above-cited indices compared with the control. Positive interaction
between foliar spray of calcium and potassium fertilization and foliar spray of antioxidants
were often observed.
Conclusion:
The best results were obtained by foliar spray of only 2000 ppm of calcium or with the
interaction among 1000 ppm of calcium, potassium fertilization at 72 kg K2O/fed. and foliar
spray of antioxidants as ascorbic acid at 200 ppm or salicylic acid at 200 ppm, under the
conditions of El-Bramoon Agricultural Research farm of Mansoura Horticultural Research
station.