The effect of phosphate solubilizing bacteria and organic fertilization on availability of Syrian rock phosphate and increase of triple superphosphate efficiency.

摘要

A set of pot experiments was conducted to study the effects of bio- and organic fertilizers on rock phosphate (RP) availability and increase of superphosphate efficiency (SP). The experiment included eighteen treatments (control; RP; SP; phosphate solubilizing bacteria "SB"; organic manure "OM"; olive residue "OR"; OM+B; OR+B; RP+B; SP+B; RP+OM; SP+OM; RP+OM+B; SP+OM+B; RP+OR; SP+OR; RP+OR+B; SP+OR+ B) with three replications. Soil content with available P significantly increased in treatment amended with PSB by 30% as compared to control. However, available P was significantly increased in treatment (PSB+SP) by 61% as compared to control. Adding OM into soil increased available P. Available P was significantly increased in treatment amended with OM and SP by 33% as compared to treatment amended with only OM. Moreover, available P increased in treatment amended with SP and OR by 84% as compared to treatment amended with only OR, as consequently PSB and organic matters increased the efficiency of SP. Available P significantly increased in treatment amended with organic manure (OMBRP) as compared to treatment (OMRP). In terms of increasing P availability, the treatments amended with SP, PSB and OR were the best.