Abstract
The aim of the research was to determine the influence of oryzalin concentration on the two tomato varieties (Var. Permata and Tymoti). The research was conducted in Agricultural Faculty’s screen house, Universitas Sumatera Utara. The research was used Factorial Randomized Block Design with the first factor was Tomato varieties (Var. Permata and Tymoti), and the second was concentration of Oryzalin (0 µM as control, 30 µM, 60 µM, 90 µM and 120 µM). Parameters observed 30 days after sowing were the plant height, leaf number and the stem diameter of both tomato varieties. The results showed that there was no variation between var. Permata and Tymoti in parameters observed. However, there were differences among plants growth treated plants by Oryzalin concentration. In general, the higher the concentration of oryzalin, the shorter the plant height, the fewer leaf number and the smaller stem diameter for both tomato varieties.
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