Investigation of actinomycetes inoculation on phosphorus dissolution and the effect of two selected isolates on the growth and nutritional indices of barley plant

Articles in Press

Document Type : Research Paper

Authors

1 Department of Soil Science, Faculty of Agriculture, University of Guilan, Rasht, 41635-1314, Iran

2 Department of soil Science, University of Guilan, Rasht, Iran

3 Agriculture Organization of Guilan Province, Management of Plant Protection, Rasht, Iran.

10.22059/ijswr.2025.404231.670026

Abstract

This study was conducted in two parts to investigate the ability of actinomycete strains to enhance phosphorus (P) solubility, improve soil properties, and promote barley growth. In the first part, a factorial experiment with a completely randomized design with three replications was carried out using 29 actinomycete strains and three types of culture media, GA, NBRIP, and SMM, to evaluate the effectiveness of these strains in dissolving P and altering the pH of the culture media. In the second part, barley was cultivated in a completely randomized block design under four treatments: control (C), chemical fertilizer (CF), and two actinomycete strains, S4A and S4F, with three replications. After 40 days of cultivating and harvesting barley, some soil characteristics, growth traits, and the nutritional status of the plant were evaluated. The GA medium exhibited the highest average pH at 6.14, along with the highest P solubility at 172.4 mg L-1. The highest soil P was found in the S4A. Additionally, there were significant increases in mineral nitrogen and available potassium in both the S4A and S4F. Stem length, root length, and shoot dry weight did not show a significant difference in the CF with two actinomycete strains. The P and iron contents in the plants in S4A and S4F showed a significant increase compared to C and CF. Using actinomycete strains as biofertilizers can enhance soil stability and fertility. Therefore, it is recommended to apply biofertilizers in conjunction with chemical fertilizers to support sustainable agriculture and environmental protection.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 13 December 2025

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