Effect of Sequential Application of Herbicides on Weed Persistence Index and on Nutrient Status in Sweet Corn Crop (Zea mays var saccharata)

摘要

A field experiment was conducted during 2015 to study the efficacy of sequential application of herbicides viz., atrazinc, pendimethalin, halosulfuron methyl, topramezone and tembotrione in sweet corn. The lowest persistence of weeds was observed withatrazine/fo tembotrione and phytotox-icity symptoms observed on sweet corn at 3-4 leaves stage when halosulfuron methyl applied as pre emergence @ 110 g a. i. per hectare. Application of atra-zine fb tembotrione or topramezone were found to be at par with weed free condition with respect to fresh cob yield of sweet corn. Maximum uptake of N, P, K (kg ha~(-1)) by sweet corn was observed with atrazine fb tembotrione whereas, the same treatment resulted in lower removal of N, P and K by weeds.