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Emergence and Growth of Sicklepod (Cassia obtusifolia) with Various Planting and Herbicide Incorporation Depths

Published online by Cambridge University Press:  12 June 2017

David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Hector P. Rainero
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Clyde A. Smith
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Marshall B. Wixson
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
W.R.A.S. Ratnayake
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Stacey A. Bruff
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Larry J. Newsom
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762

Abstract

Greenhouse experiments were conducted to evaluate effects of sicklepod planting depths and chlorimuron, imazaquin, and metribuzin incorporation depths on sicklepod seedling emergence and growth. There was 35 and 90% sicklepod seedling emergence from 0- and 2-cm planting depths, respectively, in untreated soil 26 days after planting; emergence decreased with each additional increment below 2 cm. Chlorimuron at 63 g ai ha reduced the number of plants present 11 days after planting at 1- and 2-cm planting depths except when unincorporated. However, deeper sicklepod planting required chlorimuron incorporation to at least 6 cm for maximum reduction of plants. Imazaquin at 140 g ai ha was not as effective as chlorimuron, but a reduction in the number of plants was noted at 1- and 2-cm planting depths when imazaquin was incorporated to 4, 6, or 8 cm. Metribuzin at 420 g ai ha consistently reduced the number of plants at all incorporation depths except when unincorporated but had little effect on emergence. Chlorimuron and imazaquin reduced sicklepod dry weight most for all planting depths when incorporated 4 to 10 and 6 to 10 cm, respectively. Metribuzin reduced sicklepod biomass at all incorporation depths.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1990 by the Weed Science Society of America 

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