INFLUENCE OF MINERAL FERTILIZATION DEDUCTION WITH RHIZOBIUM AND MYCORRHIZA DUAL INOCULATION ON TWO BEAN (PHASEOLUS VULGARIS L.) CULTIVARS UNDER FIELD CONDITIONS

Abstract

Two field experiments were conducted 2015 and 2016 to study theinfluence of rhizobium and/or mycorrhiza inoculation under 50% ofrecommended mineral nitrogen and phosphorus doses compared with 100%recommended doses of nitrogen and phosphorus (control) on growth, podsyield and its components and leaf chemical constituents of snap bean cvs.Paulista and red kidney bean plants. The obtained results, obviously, studyrevealed that the red kidney bean showed better performance significantly thanPaulita for all the studied characters, in both seasons. Fertilization treatment of100%NP and/or 50%NP + dual inoculation with rhizobium and mycorrhiza gavethe most favorable effect comparing with other fertilization treatments for allstudied characters, in both seasons; without significant difference betweenthem; except for 100%NP which gave significant higher shoot fresh weightcompared with 50%NP+RM, in both seasons. The interaction effect betweenbean cultivars and fertilization treatments showed significant superiority of100%NP or 50%NP+ dual inoculation of rhizobium and mycorrhiza with redkidney bean for most cases without significant difference between them, inboth seasons. Results of this investigation referred to the ability of reducingnitrogenous and phosphorus mineral fertilization with 50% by using the dualinoculation of mycorrhiza and Rhizobium for achieving the same growth andyield with lowering the consequential environmental hazardous from intensivemineral fertilization use.