Merfat T. Ben Mahmud ^(1)*

(1). Department of Soil and Water, Faculty of Agriculture, Tripoli University, Tripoli, Libya.

(*Corresponding author: Dr. Merfat T. Ben Mahmud, E-mail: dr.mbenmahmoud@yahoo.com).

Received:29/03/2022                       Accepted:2/06/2022

Abstract: 

This study was conducted in Wadi Elrabie (Tajoura) region, which is an agricultural area in Libya during the autumn agricultural season 2021. To find out the effect of biofertilization represented by Plant growth-Promoting Rhizobacteria PGPR, Azotobacter, Burkholderia, and Bacillus locally isolated from the soil of the study area with organic fertilizer OM (a mixture of poultry and sheep manure) on the availability of nutrients in the soil (nitrogen, phosphorous, Potassium) and the growth of potato cultivar Spunta. Where the results showed the superiority of the treatment of the mixture of the three types of bacteria and organic fertilizer in all the studied traits, as the concentration of nitrogen, phosphorous and potassium was recorded as 64.5, 18.75 and 165.5 mg / kg soil, the average plant height was 76.1 cm, the number of aerial stems was 4, and the total production was 30.5 tons / hectare The concentration rates of nitrogen, phosphorous and potassium also increased, as the treatment of a mixture of the three types of bacteria recorded the highest results, reaching 54.28, 16.35 and 149.74 mg/kg soil, plant height rate of 62.53 cm, number of stems 3.03 and total production of 22.48 tons/ha. Results The concentration of the elements increased with the addition of organic fertilizer and reached 61.47, 15.27 and 129.09 mg/kg soil, with a significant difference from the control treatment, which recorded the lowest results.

Keywords: Biofertilization, Plant Growth, Promoting Rhizobacteria, Organic  Fertilization, Potato Plant                     

Full paper in Arabic: pdf