Hebicides-mediated weed control of soybean saturated on tidal swamp

Abstract

Herbicide can be used to control some weeds in soybean saturated cultivation on tidal swamp environment. The objective of this study was to obtain the most effective herbicides for controlling weeds on soybean saturated culture grown in tidal swamp. The research was conducted on tidal swamp at Banyu Urip village, Tanjung Lago sub districts, Banyuasin, Palembang, South Sumatera Province from July to December 2013. The experiment was done in a randomized block designed with one factor and three replications. There were eight treatments including control (P0), manual weeding at 4 weeks after planting (P1), 2 L haˉ¹ of paraquat application at 4 weeks after planting (P2), 3 L haˉ¹ of glyphosate application at 4 weeks after planting (P3), 2 L haˉ¹ of oxyfluorfen application 3 days before planting (P4), 2 L haˉ¹ of oxyfluorfen followed by paraquat application 3 days before planting and 4 weeks after planting (P5), 2 L haˉ¹ and 3 L haˉ¹ of oxyfluorfen followed by glyphosate application 3 days before planting and 4 weeks after planting (P6), 1 L haˉ¹ of penoxulam application at 2 weeks after planting (P7). The results showed that paraquat effectively suppressed the total weight of weed at 4, 6, and 8 weeks after planting. The highest soybean productivity was 3.76 tons haˉ¹ as resulted from glyphosate treatment. Our results indicate that weeds eradication by applying herbicide as pre-treatment prior planting is necessary and that the herbicide application should be carried out in a way to minimize toxicity in plants.