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Pinto bean response to seeding rate and herbicides

Published online by Cambridge University Press:  17 December 2020

Kathrin D. LeQuia ,
Don W. Morishita Open the ORCID record for Don W. Morishita [Opens in a new window] ,
Olga S. Walsh Open the ORCID record for Olga S. Walsh [Opens in a new window]  and
Albert T. Adjesiwor Open the ORCID record for Albert T. Adjesiwor [Opens in a new window]
Kathrin D. LeQuia
Affiliation:
Former Graduate Research Assistant, University of Idaho, Kimberly Research & Extension Center, Kimberly, ID, USA
Don W. Morishita*
Affiliation:
Professor Emeritus, University of Idaho, Kimberly Research & Extension Center, Kimberly, ID, USA
Olga S. Walsh
Affiliation:
Associate Professor, University of Idaho, Parma Research & Extension Center
Albert T. Adjesiwor
Affiliation:
Assistant Professor, University of Idaho, Kimberly Research & Extension Center, Kimberly, ID, USA
*
Author for correspondence: Don Morishita, University of Idaho, Kimberly Research & Extension Center, 3806 N 3600 E, Kimberly, ID83341. Email: [email protected]
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Abstract

Field experiments were conducted in 2016 and 2017 to evaluate the effects of seeding rate and herbicide programs on weed control and pinto bean yield under irrigation. The experiments comprised a 5 × 5 factorial randomized complete block design with five replications. The weed control treatments comprised a nontreated control, hand-weeded control, EPTC + ethalfluralin PRE, EPTC + ethalfluralin PRE followed by (fb) dimethenamid-P POST at V1, and EPTC + ethalfluralin PRE fb bentazon/imazamox POST. There were five seeding rates ranging from 247,000 to 494,000 seeds ha–1 planted in 19-cm rows. Weed biomass was reduced by 6 kg ha–1 with every additional 1,000 seeds ha–1. EPTC plus ethalfluralin fb either dimethenamid-P or bentazon plus imazamox reduced weed biomass by at least 29% compared to the nontreated control. There was a significant effect of weed control treatment on pinto bean yield (P = 0.0004). However, there was no significant seeding rate (P = 0.42) or seeding rate–by–weed control interaction effect on pinto bean yield (P = 0.38). Pinto bean yield ranged from 3,080 kg ha–1 in the nontreated control to 4,740 kg ha–1 hand-weeded treatment. Increased seeding rate in narrow rows is a cultural practice that can improve weed control in pinto bean but may not necessarily increase yield.

Keywords

Crop densitycultural weed controlnarrow row spacingintegrated weed managementweed suppressionEPTCethalfluralindimethenamid-Pbentazonimazamoxpinto bean, Phaseolus vulgaris L.
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 4 , August 2021 , pp. 628 - 631
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Robert Nurse, Agriculture and Agri-Food Canada

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