Authors:- Hossein Soleimanzadeh
Published:- American-Eurasian J. Agric. & Environ. Sci., | 2012 | 2 (3): 337-341

Abstract:-

The effect of seed inoculation by Mycorrhizae and different levels of phosphorus fertilizer on growth and yield of sunflower (Azargol cultivar) was studied in experiment farm of Islamic Azad University, Pars Abad Moghan Branch during 2010 growing season. The experiment treatments were arranged in factorial based on a complete randomized block design with three replications. Four phosphorus fertilizer levels of 25%, 50% 75% and 100% P recommended with two levels of Mycorrhizae: with and without Mycorrhizae (control) were assigned in a factorial combination. Results showed that head diameter, number of seeds per head, seed yield and oil yield were significantly higher in inoculated plants than in non-inoculated plants. Head diameter, number of seeds per head, 1000 seeds weight, biological yield, seed yield and oil yield were increased with increasing P level above 75% P recommended in non-inoculated plants, whereas no significant difference was observed between 75% and 100% P recommended. The positive effect of mycorrhizal inoculation decreased with increasing P levels due to decreased percent root colonization at higher P levels. According to the results of this experiment, application of mycorrhizae in present of 50% P recommended had an appropriate performance and could increase seed yield and oil production to an acceptable level, so it could be considered as a suitable substitute for chemical phosphorus fertilizer in organic agricultural systems.

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