Response of corn (Zea mays L.) production in response to PGPRs under different rates of phosphorus

摘要

Plant growth promoting rhizobacteria (PGPRs) may be significant on yield levels and efficient for crop production. Field experiment was conducted in Karaj Research Field in 2010 with corn cultivars (Zea mays L. var. SC 704 and SC 700) and combinationof PGPRs (Pseudomonasputida, Amspirillum lipoferum and Azotobacterchrococcum) and different phosphorus fertilizer rates. In our research, a significant difference was observed in PGPR+P treatments. The mean yield was 4.7 and 4.1% higher with PGPR+20% P (60 kg triple super phosphate/ha) than adequate phosphorus fertilizer (300 kg triple super phosphate/ha without PGPRs) applied in SC 704 and SC 700 cultivars, respectively. Overall application of all PGPR+P (60 to 240 kg TSP/ha) treatments increased meangrain yield. The results indicated that P supply was related to PGPRs and it was the way for reduction of chemical fertilizers application.