Rice plants are important food crops in the world besides wheat and corn. Rice plants can produce rice, which rice is the most important staple food for the majority of Indonesian people. One way to satisfy the demand for rice is by planting superior varieties. One important component for supporting the success of rice planting is the seed's quality. But the continued supply of rice seeds are hampered by dormancy. Therefore, special treatment is needed to break that dormancy so the seeds can germinate. The purpose of this study was to determine the interaction between duration of immersion the KNO3 solution to several rice seed varieties. This research was conducted in Meduran, Ringinpitu, Plemahan, Kediri, East Java, from March-April 2019. This research using Completely Randomized Design (Factorial), consist of two factors. The first factor was the immersion time of the KNO3, 3% consisting of 4 levels, that was soaking for 12, 24, and 36 hours. The second factor was the kind of rice seed varieties consisting of 3 levels, that was Ciherang varieties, Inpari-32, and Situ Bagendit. The results of this study indicated that there was no interaction between the duration of soaking the KNO3solution to several rice seed varieties. The single treatment of immersion time significantly affected the parameters of long radicular observation and the number of leaves. The single treatment of varieties has a significant effect on germination, germination rate, simultaneous growth, radicular length, seedling height, and the number of leaves.
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