The effects of alfalfa extract and plant growth promoting rhizobacteria on growth and uptake of micronutrients in sorghum (Sorghum bicolor L. Var. Speedfeed).

Asma Miri1, Ahmad Gholamalizadeh Ahangar2, Ebrahim Shirmohammadi3* and Maryam Ghorbani3

ABSTRACT

In order to evaluate the effect of alfalfa extract and plant growth promoting rhizobacteria (PGPR) on growth and uptake of micronutrients in sorghum, a pot experiment was arranged in factorial based on completely randomized design with six replications. The first factor was inoculations (non-inoculated-control and inoculated soil medium with PGPR) and second factor included alfalfa extract concentrations (0, 2 and 4 per thousand). The results showed that by increasing the alfalfa extract, dry weight and uptake of micronutrients such as iron, zinc, manganese and copper increased in shoot of sorghum. Adding PGPR to the soil increased uptake of copper in the plant. Also, alfalfa extract at the level of 4 per thousand and PGPR added to growth medium (soil) significantly increased uptake of manganese in the shoot of sorghum. At the level of 2 per thousand of alfalfa extract, adding these microorganisms to the soil significantly decreased dry weight of sorghum shoot. In general addition of the 0.004 alfalfa extract with PGPR in soil had the best effect on studied parameters.

Keywords: Alfalfa extract, Dry weight, Micronutrients, Plant growth-promoting rhizobacteria, Sorghum

 

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