Abstract

                                A field trial was conducted at Ranchi Agricultural College, Kanke, Ranchi to study the influence of various doses of six pesticides on nodulation, grain and straw yields and nitrogen uptake by grain and straw of soybean (Glycine max L. Merril). It was observed that highest number of nodules, grain and straw yields was obtained with the application or recommended and double of the recommended doses of all pesticides except 2,4-D and butachlor decreased the straw yield even at the double the recommended dose. The adverse effect on number of nodules and grain and straw yield of soybean was observed at three and five times of the recommended dose, the lowest being with five times of the recommended dose of all pesticides. The highest nitrogen uptake by the grain and straw or soybean was observed with the application of carbofuran at recommended dose where as the application 2,4-D at five times of the recommended dose resulted in lowest nitrogen uptake by grain and straw of soybean.

Key words : Pesticides, Nodulation, Yield, N uptake, Soybean