Fertiliser N and P rates can be halved in sugar beet through bacterial inoculation

Hamid Hatami1, Mohammad Reza Tokalloo2, Mojtaba Ghanbarabadi3  and Soghra Kebriaie4

1,2 Faculty member, Bojnourd branch, Islamic Azad University, Bojnourd, Iran, Email: hatamee@hotmail.com

3,4 Graduated Master of Science, Bojnourd branch, Islamic Azad University, Bojnourd, Iran, Email: kebriay@hotmail.com 


In order to reduce the use of nitrogen and phosphorus fertilisers in sugar beet cultivation, an experiment was conducted in a completely randomized block design with four replications during 2017 in Iran. Experimental treatments were consisted of: no fertiliser application, 100% of currently recommended rates of  N and P fertiliser (110 kg N/ha as urea, 36 kg P/ha as triple superphosphate) and a combination of 75%, 50% and 25% of N and P with two bacterial inoculation products – “Phosphozist”, which contains phosphobacteria that cause soil P to become more readily available to plants, and “Nitrozist” containing free-living N-fixing Azotobacteria. The highest sugar yield of 6.8 t/ha was obtained with 50% of the recommended rate of N and P with both “Phosphozist” and “Nitrozist”. Lower yields were obtained at both 25% and 75% of recommended rates, and the 100% N and P rate without inoculation. The highest concentrations of N and K in the beet (which are contaminants in sugar beet) occurred at the 100% N and P rate without inoculation.  The results of the experiment showed that N and P application rates can be halved through inoculation with phosphobacteria and free-living N fixers.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography david_marland@hotmail.com Graham Centre for Agricultural Innovation, Charles Sturt University

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