Competition dynamics of Parthenium hysterophorus in direct-seeded aerobic rice fields

Ali A. Bajwa, Aman Ullah, Muhammad Farooq, Bhagirath S. Chauhan, Steve Adkins

Research output: Contribution to journalArticle

Abstract

Parthenium hysterophorus is a prolific invasive weed species, which infests many crops in over 40 countries around the world. A 2-year field study was carried out to quantify the potential impacts of this weed on direct-seeded rice. Parthenium weed was allowed to compete for 2, 4, 6 or 8 weeks after crop emergence, while full season weedy and weed-free plots were maintained as controls. Parthenium weed plants grew taller and attained more biomass as the competition duration prolonged. The yield and yield-related attributes of rice were negatively affected with increasing competition duration. The season-long competition caused the highest reductions in panicle number (28-34%), panicle length (26-27%), grains per panicle (22-23%) and grain yield (33 and 38%) of rice in both years. Weed competition for 2-8 weeks caused 5-34% and 6-33% losses in rice grain yield during both years, respectively. Importantly, Parthenium weed control after 8 weeks of competition did not improve rice yield significantly. The results suggested that Parthenium weed should be controlled in rice fields between 4 and 8 weeks after crop emergence under direct-seeded conditions to avoid over 10% yield losses.

Original languageEnglish
JournalExperimental Agriculture
DOIs
Publication statusE-pub ahead of print - 20 Aug 2019

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Parthenium hysterophorus
Parthenium
paddies
weeds
rice
crops
grain yield
crop-weed competition
duration
weed control
biomass

Cite this

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title = "Competition dynamics of Parthenium hysterophorus in direct-seeded aerobic rice fields",
abstract = "Parthenium hysterophorus is a prolific invasive weed species, which infests many crops in over 40 countries around the world. A 2-year field study was carried out to quantify the potential impacts of this weed on direct-seeded rice. Parthenium weed was allowed to compete for 2, 4, 6 or 8 weeks after crop emergence, while full season weedy and weed-free plots were maintained as controls. Parthenium weed plants grew taller and attained more biomass as the competition duration prolonged. The yield and yield-related attributes of rice were negatively affected with increasing competition duration. The season-long competition caused the highest reductions in panicle number (28-34{\%}), panicle length (26-27{\%}), grains per panicle (22-23{\%}) and grain yield (33 and 38{\%}) of rice in both years. Weed competition for 2-8 weeks caused 5-34{\%} and 6-33{\%} losses in rice grain yield during both years, respectively. Importantly, Parthenium weed control after 8 weeks of competition did not improve rice yield significantly. The results suggested that Parthenium weed should be controlled in rice fields between 4 and 8 weeks after crop emergence under direct-seeded conditions to avoid over 10{\%} yield losses.",
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language = "English",
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Competition dynamics of Parthenium hysterophorus in direct-seeded aerobic rice fields. / Bajwa, Ali A.; Ullah, Aman; Farooq, Muhammad; Chauhan, Bhagirath S.; Adkins, Steve.

In: Experimental Agriculture, 20.08.2019.

Research output: Contribution to journalArticle

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AU - Adkins, Steve

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