Integrating Half Rates of Dicamba and Atrazine with Increasing Sorghum Density and Nitrogen Rate for Palmer Amaranth Control

I B Cuvaca,R Currie,A J Foster

doi:10.4148/2378-5977.7589

Abstract

Integrating Half Rates of Dicamba and Atrazine with Increasing Sorghum Density and Nitrogen Rate for Palmer Amaranth Control

Highlights

Sorghum is an important crop in Kansas
Particular research emphasis was to evaluate the effect(s) of integrating half rates of dicamba and atrazine applied as PRE with increasing sorghum density and nitrogen rate on Palmer amaranth control and grain yield in an irrigated environment
Integrating half rates of dicamba and atrazine with increasing sorghum density and nitrogen rate could speed up canopy closure and suppress Palmer amaranth (PA)

Summary

In-season weed control options for grain sorghum (Sorghum bicolor) are limited. Palmer amaranth (Amaranthus palmeri) can significantly reduce sorghum yield. Integrating half rates of dicamba and atrazine with increasing sorghum density and nitrogen rate could speed up canopy closure and suppress Palmer amaranth (PA). A study was conducted at the Southwest Research-Extension Center near Garden City, KS from 2016 to 2017 to determine if PA could be suppressed with half-rates of dicamba and atrazine applied as preemergent (PRE) with increasing sorghum density (60,000, 90,000, and 120,000 seeds/a), and nitrogen rate (0, 100, and 200 lb/a). Sorghum grain yield was reduced by about 40% with the integration of increased sorghum density and nitrogen rate with half rates of dicamba and atrazine. Integrating half-rates of dicamba and atrazine applied as PRE with increasing sorghum density and nitrogen rate may not be an effective strategy for Palmer amaranth control

Introduction

Procedures

Conclusion