Abstract

This research was conducted in Nagari Selayo Tanang Hill Sileh, Lembang Jaya, Solok, West Sumatra. The purpose of this study was to determine (1) the best combination of indigenous rhizobacterial isolates and coumarin, (2) the rhizobacterial best individual isolates and (3) the best concentration of coumarin for the growth and yield of potato plants. A completely randomized factorial (4x3) design with three replicates was used. The first factor was the rhizobacterial isolates (A2.1b2, A3.1a5, or B1.2a1) and the second factor was coumarin at concentrations of 75, 100 and 125 milligrams per liter. The Data were Analyzed using analysis of variance and further tested with Duncan’s New Multiple Range Test at the 5% level. The combination of an indigenous rhizobacterial isolate and coumarin influenced the net assimilation rate and plant growth rate. Plant height, leaf area index, net assimilation rate, root length, the root / canopy ratio and tuber weight were not influenced by indigenous rhizobacteria. Coumarin at the concentration of 125 milligrams per liter gave the best results for plant height, net assimilation rate, tuber growth rate, tuber number and tuber weight.

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