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Impact of Irrigation and Hail on Palmer Amaranth (Amaranthus Palmeri) in Corn

Published online by Cambridge University Press:  20 January 2017

Randall S. Currie  and
Norman L. Klocke
Randall S. Currie*
Affiliation:
Kansas State University Southwest Research-Extension Center, 4500 East Mary Street, Garden City, KS 67846
Norman L. Klocke
Affiliation:
Kansas State University Southwest Research-Extension Center, 4500 East Mary Street, Garden City, KS 67846
*
Corresponding author's E-mail: rscurrie@ksu.edu
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Abstract

In 2005 a hailstorm struck a long-term dose–response study of irrigation requirements and corn plant populations. This misfortune occurred again in 2006 at approximately the same growth stage. Therefore, the objectives of the studies were redirected to measure the impact of actual hail events on corn leaf area index (LAI) and the competitive interaction of escaped Palmer amaranth populations induced by hail across different levels of irrigation and corn populations. In 2005, the study treatment with the lowest corn population and level of irrigation had twice the Palmer amaranth biomass (PABM) at corn harvest compared with the highest corn population and irrigation level. Corn LAI produced simple linear models that predicted both corn grain yield and PABM. In 2007, the nonhail year, PABM was depressed 4- to 15-fold compared with hail years. PABM declined linearly from 417 kg/ha at the lowest level of irrigation and corn population to 48 kg/ha at the highest level of irrigation and corn plant population. Although economic return per increment of irrigation declined in both hail years, the trends in economic returns were still positive. This suggests that a producer with similar conditions should continue to irrigate even though his or her rate of economic return is reduced.

Keywords

Palmer amaranth, Amaranthus palmeri S. Wats. AMAPAcorn, Zea mays L.Integrated weed managementleaf area index (LAI)hail
Type
Weed Management — Major Crops
Information
Weed Technology , Volume 22 , Issue 3 , September 2008 , pp. 448 - 452
Copyright
Copyright © Weed Science Society of America 

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