الفهرس 
INRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Two field experiments were carried out during the two successive summer seasons of 2018 and 2019 at the experimental farm of the Faculty of Agriculture, Moshtohor, Benha University to investigate the effect of different levels of mineral NPK fertilizers added with bio fertilizer to the soil and foliar spray with some growth stimulants such as yeast extract, garlic extract, seaweed extract and potassium citrate as well as their interaction on vegetative growth characters, chemical constituents of plant foliage, total tuber yield, physical and chemical quality of potato tubers (Solanum tuberosum L.) cv. Sponta. Each experiment included 15 treatments resulted from the combination of three soil addition with five foliar application as follows. 100% mineral NPK fertilizer (of the recommended dose), 80% mineral NPK fertilizer + Bio fertilizer and 60% mineral NPK fertilizer + Bio fertilizer while Foliar application treatments, Potassium citrate at 5g/L, Yeast extract at 5%, Seaweed extract at 5%, Garlic extract at 5% and Control (without spraying). Obtained results revealed the following, using bio-fertilizers (Rhizobacterin, Phosphorin and Potassine) as soil inoculation two times during planting date and after compelete germination and fertilizing the grown plants with 80% of the recommended NPK dose [150 kg N per Fed. (As ammonium nitrate 33% N), 60 kg P2O5 (As Calcium superphosphate 16% P2O5) and 96 kg K2O per Fed. (As potassium sulphate 48% K2O)] combined with the foliar