Ecology and Control of Speen amaranth (Amaranths patulus) in Soybean

Yong Ho Lee1   Soo In Sohn2   Sun Hee Hong1   Chang Seok Kim3   Chae Sun Na4   Young Ju Oh5,*   

1Plant Life & Environmental Science, Hankyong National University, Anseong 17579, Korea
2Biosafety Division, National Institute of Agricultural Science, RDA, Jeonju 54873, Korea
3Highland Agriculture Research Institute, National Institute of Crop Science, RDA, Pyeongchang 25342, Korea
4Seed Conservation Research Division, Baekdudaegan National Arboretum, Bonghwa 36209, Korea
5Institute for Future Environmental Ecology Co., Ltd, Jeonju 54883, Korea

Abstract

The purpose of this study was to investigate the germination ecology and soybean yields with different densities of Amaranths patulus and effects of herbicides, metolachlor, alachlor, trifluralin, bentazone, glyphosate-potassium, triclopyr-TEA. The distribution of A. patulus was surveyed at 868 research sites in Korea. Two germination tests about temperature and soil depth were conducted to elucidate the germination characteristics of A. patulus in arable lands. A. patulus showed highest germination rate at 35℃ and the optimum temperature for germination of A. patulus. Under alternative temperature condition, high germination rate was observed at 25/30℃ (night/day) and 30/35℃. The germination rate by soil depth showed high germination rate at 0.5 and 1 cm. The soybean yield decreased rapidly as the density of A. patulus increased in soybean field. Soil treatment agents such as metholachlor and alachlor were effective for controlling of A. patulus and, triclopyr-TEA, glyphosate potassium and betazone were effective as foliage treatment agents.

Figures & Tables

Fig. 1. Distribution map of in Korea.