Implications of Applied P-Sources with Calcium Super Phosphate, Phosphoric Acid and Rock Phosphate, and Phosphate Dissolving Bacteria on Snap Bean Grown Under Greenhouses Conditions

Two field  experiment were carried out  during the two successive  winter seasons  of 2017-2018 and 2018-2019 in a private sector farm at Damallo Village, Qalubia Governorate, to investigate the effect of different sources of phosphorus  as a soil application i.e., Calcium superphosphate (15.5% P₂O₅) at 50g/m², Rock phosphate (26.3% P₂O₅) at 27g/m² ,  Phosphoric acid (56%P₂O₅) at 14.3mg/m²  at recommended dose with/ without bio fertilizer Bacillus megaterium var. phosphaticum "phosphate dissolving bacteria "PDB" as well as their interaction on vegetative growth, chemical composition and productivity as well as pod quality of snap bean (Phaseolus vulgaris L.) cv. moraleda. Results showed that using Phosphoric acid (56%P₂O₅) fertilizer at the recommended dose of mineral fertilizer reflected significantly highest values in all measured vegetative growth aspects, chemical constituents of plant foliage, pod yield and its quality of bean plants compared with rock phosphate at the recommended dose of mineral fertilizer which gave the lowest values in the two seasons of study. In addition, fertilizing snap bean plants with Bio-Phosphorus fertilizer contained phosphate dissolving bacteria (PDB) (Bacillus megaterium var phosphaticum) at rate of 4 L/greenhouse applied alone at soil subsurface near the plant roots at two time started after two weeks from transplantation with one month interval at 2 l/360m²increased all measured parameters compared with the treatment without addition in the two seasons of study. Moreover, fertilizing the plants with different sources (p) plus (PDB) gave the highest values in most measure under study, fertilizing plants with phosphoric acid plus PDB  gave  the highest values in all vegetative growth aspects, fruit pod yield and the best quality compared with other treatments during both seasons of study.