Abstract
Test of resistance of some varieties and the influence of planting distance on leaf rust (Puccinia polysora Underw.) on lowland. The aim of the research was to know the resistance of some varieties of corn (Zea mays L.) and the influence of planting distance on leaf rust (Puccinia polysora) on lowland. The research was conducted at Tanjung Selamat village, Medan. The research used Cluster Random Design of 2 factorials with 9 treatments and 3 repetitions. The results of the research showed that the varieties of BISI 13 were resistant to leaf rust of corn. The optimal treatment of planting distance for the attack of corn leaf rust was 70 x 25 centimeters. The appropriate treatment of varieties and planting distance for the corn leaf rust attack was on V3J3 treatment (BISI 13 with the planting distance of 70 x 25 centimeters). The highest corn production of the varieties of BISI 13 was 6.3 tons/ha. The highest corn production of the planting distance treatment of 70 x 25 centimeters was 5.58 tons/ha. The highest corn production in the interaction treatment of BISI 13 with the planting distance of 70 x 25 centimeters was 7.54 tons/ha. Keywords: varieties of corn, planting distance, P. polysora, leaf rust, resistant varieties
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