Ervinda Yuliatin, Tri Ardyati, Suharjono Suharjono
The objective of this research was to determine the effect of physicochemical properties of coffee plantation soil on density of plant growth-promoting rhizobacteria (PGPR). The PGPR bacteria were isolated from rhizosphere of Coffea arabica and Coffea canephora soil using serial dilution method. The number of IAA-producing, phosphate-solubilizing, and nitrogen-fixing bacteria were determined by Tryptic Soy Agar, Pikovskaya Agar and Nitrogen-free-Bromothymol Blue Agar medium, respectively. The density of IAA producing bacteria and nitrogen-fixing bacteria of Coffea arabica soil 1.5×105 cfu/g and 2×104 cfu/g, respectively were higher than Coffea canephora soil. The density of phosphate-solubilizing bacteria 1.7×105 cfu/g of Coffea canephora was higher than Coffea arabica soil. Environmental parameters of both coffee species were significantly influenced by latitude, light intensity and tree height (p<0.05). The C/N ratio was significantly higher of Coffea arabica soil 11.33 % than Coffea canephora soil 8.66 %. The highest correlation (correlation > 0.86) was between nitrogen-fixing bacteria and IAA-producing bacteria. This analysis can be performed that the density of PGPR may vary due to some soil properties, environment factors, and plant characteristics. © 2019 Published under licence by IOP Publishing Ltd.
Department of Biology, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang, East Java, Indonesia
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