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Increasing the productivity of potato crops will require the availability of tubers that are of high quality and resistant to disease. Giving isolates rhizobacteria and coumarin is expected to increase the growth and formation of potato tubers. The purpose of this study was to obtain the best types of rhizobacteria and coumarin concentrations in increasing the productivity of potato plants. The research was conducted in the experimental garden of the Center for Technology Transfer and Agricultural Zone Development of Andalas University, Alahan Panjang, Solok Regency, West Sumatra, from October 2016 to January 2017. The study used a 2-factor complete randomized design with three replications. The first factor was rhizobacterial isolates, namely without bacteria, BT.4.1 isolates, BT.4.2 isolates, BT.4.3 isolates. The second factor was the concentration of coumarin growth inhibitors, namely 0, 50, 100, and 150 mg L-1. The parameters observed were morphological characterization rhizobacteria, leaf area, relative growth rate, growth rate potato tubers at 1-month-old, fresh weight of tubers aged 100 days after planting, tuber classes, namely: large, medium and small. Observation data were analyzed by the F test, followed by the HSD test at 5% level. The results showed that BT4.1 and BT.4.2 rhizobacteria with coumarin 100 mg L-1 and 150 mg L-1 increased the growth of potato plants, while the results of potato plants were more affected by the application of BT.4.1 and BT rhizobacteria.

Pemberian Rizobakteri dan Coumarin pada Pertumbuhan dan Pembentukan Umbi Tanaman Kentang (Solanum tuberosum L)