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Abstract
This experiment was carried out during the two successive seasons of 2010/2011 and 2011/2012 in the Farm of Agric. Res. Station, Wady-ElNatrown Area, Fac. Agric. Cairo University, Egypt under saline water and sandy soil conditions. This investigation aimed to study the effect of compost, natural alternative fertilizers (rock phosphate and feldspar) combined with bacterial inoculation (Azotobacter spp. & Azospirillum perna + B. megaterium + B. circulans) on vegetative growth, yield, quality of tubers, its component of (NPK, carbohydrate and nitrate) and storability of potato tubers Diamant cultivar. Three compost levels source of (N) (5.9, 8.8 and 11.8 ton/fed.), three rock phosphate levels source of (P) (204.4, 140.7, 77.04 kg/fed.) and five feldspar levels source of (K) (888.8, 592.6, 580.7, 333.3, 251.9 kg/fed.) were applied in a Randomized Complete Blocks Design with three replicates. Data collected after 40, 60 and 80 days after planting and at harvest, data showed significant increasing in vegetative growth characteristics, yield, its components and physical properties of potato tubers in potato leaves