ESTIMATING YIELD LOSSES AND ECONOMIC THRESHOLD LEVEL OF Parthenium hysterophorus IN FORAGE SORGHUM

Asif, Muhammad; Ayub, Muhammad Ashar; Tanveer, Asif; Akhtar, Javaid

doi:10.1590/s0100-83582017350100038

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…Data on stem diameter averaged over both the years showed that S.S. hybrid plants obtained highest stem diameter (1.85cm) in the experimental unit where minimum weed density (1.63 weeds tiller m -2 ) was observed and minimum stem diameter (1.0875 cm) was observed at highest weed intensity (410.62 tillers m -2 ) (Tables 1 and 3). These findings are in concurrent with the conclusions of Asif et al, 2017 andGholami et al, 2013 who observed that stem diameter reduced in un weeding treatment as compare to other weeding treatments, which shows minimum weed intensity.…”

Section: Number Of Leaves Per Tillersupporting

confidence: 89%

Comparison of Different Weedicides on Multi-cut Sorghum Sudan Grass Hybrid for Productivity Enhancement and Control of Grassy Weeds

Gondal¹,

Riaz²,

Rizvi³

et al. 2020

PJAR

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Section: Number Of Leaves Per Tillersupporting

confidence: 89%

Comparison of Different Weedicides on Multi-cut Sorghum Sudan Grass Hybrid for Productivity Enhancement and Control of Grassy Weeds

Gondal¹,

Riaz²,

Rizvi³

et al. 2020

PJAR

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“…Similar negative effects have been reported on the number of grains per cob, 1000-grain weight and yield of maize enduring Parthenium weed competition for 5-8 weeks (Safdar et al, 2016). In a recent study, sorghum crop grown for fodder purpose suffered from severe losses in plant height, stem diameter, leaf area and yield by Parthenium weed competition at the weed density of 16 plants m −2 (Asif et al, 2017).…”

Section: Discussionsupporting

confidence: 70%

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

et al. 2019

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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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“…This, we suspect is mainly due to severe resource competition at the higher weed densities and longer competition durations. Previous studies on other cereal crops also showed that this weed caused substantial yield losses at relatively high densities and for longer competition durations (Asif et al, 2017;Bajwa et al, 2019c,d;Safdar et al, 2015Safdar et al, , 2016Tamado et al, 2002). Most weed species at high densities often increase inter-specific competition which benefit them by physical dominance and better resources acquisition and crop suppression depends on weed density also differ among weed species.…”

Section: Discussionmentioning

confidence: 90%

“…In another study on maize, dry biomass of parthenium weed increased over 400% as the weed density increased from 5 to 20 plants m -2 (Safdar et al, 2015). Furthermore, parthenium weed is known to uptake more nutrients from root zone at higher densities (Asif et al, 2017;Safdar et al, 2015), enabling the whole population to grow faster and affect the crop growth at these high densities.…”

Section: Discussionmentioning

confidence: 99%

Parthenium weed (Parthenium hysterophorus) competition with grain sorghum under arid conditions

et al. 2020

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Parthenium weed is an invasive species in a growing number of countries where it infests numerous crop fields, including sorghum. Two field studies were conducted to quantify the effect of parthenium weed on the performance of grain sorghum at different weed densities (0, 5, 10, 15 and 20 plants m−2) and durations of weed-crop competition (season-long weed-free, weed-free after 2, 4, 6 or 8 weeks, and season-long weedy). Our aim was to identify the density threshold and ideal duration to control parthenium weed in sorghum fields. Both field experiments were planned in a randomised complete block design each with three replications in 2016 and were repeated in 2017. Parthenium weed biomass increased significantly with increasing density and competition duration. The increasing parthenium weed density had a linear negative effect on sorghum growth, yield and yield-contributing traits. The highest yield loss, of up to 66%, was recorded at the highest parthenium weed density of 20 plants m−2 when compared to weed-free treatment. In addition, the season-long competition of this weed with sorghum caused 81% reduction in grain yield over weed-free treatment. According to our results, parthenium weed should be managed below a density of 5 plants m−2 and throughout the crop growth duration in grain sorghum fields as it can cause serious yield losses even at low densities and through strong competition at early as well as late growth stages of the crop.

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ESTIMATING YIELD LOSSES AND ECONOMIC THRESHOLD LEVEL OF Parthenium hysterophorus IN FORAGE SORGHUM

Cited by 8 publications

References 15 publications

Comparison of Different Weedicides on Multi-cut Sorghum Sudan Grass Hybrid for Productivity Enhancement and Control of Grassy Weeds

Comparison of Different Weedicides on Multi-cut Sorghum Sudan Grass Hybrid for Productivity Enhancement and Control of Grassy Weeds

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

Parthenium weed (Parthenium hysterophorus) competition with grain sorghum under arid conditions

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