Document Type : Research Paper
Authors
1
M.Sc. Student, Fars University of Science and Research
2
Associate Professor. Soil Biology Department, Soil and Water Research Institute
Abstract
In sustainable agricultural systems, soil biological potentials, such as useful and efficient soil microorganisms, have received especial attention. Non-symbiotic helpful bacteria in the plant rhizosphere, the so called plant growth promoting rhizobateria (PGPR), directly and indirectly promote plant growth as well as quality and quantity of yield. One of the important stages in application of PGPRs is selection of efficient isolates. In the current study, in order to evaluate the efficiency of PGPR and Phosphate Solubilizing Bacteria inoculates on yield and chemical composition of corn, an experiment was conducted as factorial completely randomized block design in a field at Dashti region of Isfahan province. Treatments were: inoculation (one PGPR pseudomonas, two Phosphate Solubilizing Bacteria, and one un-inoculated control) and phosphorus fertilizer (0, 25%, 75%, and 100% of the recommended rate based on soil testing). At grains milk stage, maize plants from each plot were randomly selected and harvested, then, the grain yield as well as N, P, Zn, and Fe contents in plants were measured. The results indicated that the effect of inoculation on measured indices was significant (5% level) compared with the control. At all levels of applied fertilizer, inoculation increased corn yield compared with un-inoculated control. The highest grain yield was obtained by application of high levels of phosphorus fertilizer and PGPR inoculation. The two inoculated bio-fertilizer treatments had no significant differences in grain yield, seed weight, and number of grain in corn at different levels of the applied chemical fertilizer. But, there were significant differences in concentration of P, N, Fe, and Zn in corn plants.
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