Relations of rice seeding rates to crop and weed growth in aerobic rice

Chauhan, Bhagirath Singh; Singh, Virendra; Kumar, Avnish; Johnson, David E.

doi:10.1016/j.fcr.2010.11.019

Cited by 101 publications

(72 citation statements)

References 18 publications

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“…Currently, it is believed that high yielding inbred varieties developed through conventional breeding have reached in yield plateau. Hybrid rice cultivars have a 15-30% yield advantage over modern inbred rice varieties, therefore, hybrid rice technology is considered as the key approach for increasing global rice production (Walker et al, 2008;Chauhan et al, 2011;Haque et al, 2015). It is also reported that even in weedy conditions, the yield of hybrid cultivars is high .…”

Section: Introductionmentioning

confidence: 99%

“…In rice, the average yield losses due to weed competition are estimated to vary between 40 -60% which may go up to 94 -96% in season long weedy condition (Chauhan and Johnson, 2011). In addition, season long weedy condition reduced crop yield by up to 57% in paddy rice and 82% in direct seeded rice (Mahajan et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…However, use of same herbicide for a continuous period will cause herbicide resistant weed biotypes and shifts in weed flora (Johnson and Mortimer, 2008;Chauhan, 2012;Chauhan and Opeña, 2013). Moreover, for the sustainability point of view integration of herbicide with other weed management strategies is needed (Azmi et al, 2005;Chauhan and Johnson, 2011). The choice of a cultivars (inbred or hybrids) may play a vital role in this area as inbred and hybrids may differ in their weed suppressive ability (Mortensen et al, 1998;.…”

Section: Introductionmentioning

confidence: 99%

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E Efficacy and Economics of Herbicidal Weed Management in Monsoon Rice of Bangladesh

Islam

Popy

Hasan

et al. 2017

jsa

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Weed management is a challenging task in sustainable rice production. Physical and cultural methods of weed control are laborious and expensive, whereas chemical control is cheaper and less time consuming despite of some detrimental effect on environment with its inappropriate application. Considering these points, an investigation was conducted during July-December 2015 to find out appropriate weed management practices for inbred and hybrid rice. The experiment comprised of four rice varieties (two inbred; BRRI dhan49 and Binadhan-7, and two hybrids; Dhani gold and Agrodhan-12); and eight herbicidal weed control treatments (season-long weedy or weed free, Pretilachlor fb Penoxsolum or 2,4-D dimethyl amine, Pendimethalin fb Penoxsolum or 2,4-D dimethyl amine, Pretilachlor or Pendimethalin fb one-time hand weeding). Eleven weed species belonging to five families were observed in the experimental plots. The highest weed density and dry weight were found in season-long weedy treatment and the lowest one was found in Pretilachlor fb one-time hand weeding. The highest above ground crop biomass (9.7 t ha -1 ) and harvest index (46.3%) were obtained from the hybrid variety Agrodhan-12 and the lowest biomass (8.3 t ha -1 ) was obtained from the inbred variety Binadhan-7. Season long weed free condition resulted the highest above ground crop biomass (10.9 t ha -1 ), harvest index (48.7%), highest yield increase over control (213.8), weed control efficiency (100%) and gross return (BDT 141480 ha -1 ) and the lowest values for all those parameters were obtained from season-long weedy treatment. Season-long weed free treatment combined with Pretilachlor or Pendimethalin fb onetime hand weeding showed the best performance in reducing weed density and increasing above ground crop biomass, but gross return was higher because of high labor wages in these treatments. The highest BCR (2.5) was observed in Pretilachlor fb Penoxsolum. Therefore, from economic view point Pretilachlor fb Penoxsolum is the best combination. But from sustainability view point Pretilachlor or Pendimethalin along with one-time hand weeding may be recommended for effective weed management in inbred and hybrid rice during monsoon season.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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E Efficacy and Economics of Herbicidal Weed Management in Monsoon Rice of Bangladesh

Islam

Popy

Hasan

et al. 2017

jsa

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“…In direct-seeded rice systems, weeds are an important biological constraint and pre-emergence (PRE) herbicide application is essential for controlling weeds in these systems [6,7,10]. The use of biochar in such systems may inhibit or stimulate weed seedling emergence.…”

Section: Introductionmentioning

confidence: 99%

Rice Husk Biochar Influences Seedling Emergence of Junglerice (<i>Echinochloa colona</i>) and Herbicide Efficacy

Chauhan¹

2013

AJPS

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The use of carbonized rice husk biochar improves the fertility and productivity of poor soils in rice-based cropping systems. However, biochar may also influence weed seedling emergence and the efficacy of soil-applied herbicides. Experiments were conducted in a screenhouse to evaluate the effect of biochar rates (0, 20, 40, and 80 t·ha ) and seed burial depth (0, 1, and 2 cm) on seedling emergence of junglerice (Echinochloa colona) and the effect of biochar rates and pendimethalin (0, 500, 1000, and 1500 g·a.i.·ha ) and pretilachlor doses (0, 300, 600, and 900 g·a.i.·ha ) on seedling emergence and seedling biomass of junglerice. Data were analyzed using nonlinear regression. The burial depth to inhibit 50% of maximum seedling emergence was 0.76 cm when biochar was not added to soil and the depth increased with an increase in biochar rates for soil. Similarly, compared with the soil with no biochar, the use of bichoar increased the pretilachlor dose to inhibit 50% of maximum emergence or biomass. The pretilachlor dose to inhibit 50% of maximum biomass of junglerice was 100, 130, 240, and 240 g·ha −1 when biochar was added at 0, 20, 40, and 80 t·ha −1 . However, the efficacy of pendimethalin was not influenced by biochar rate. The results of this study suggest that rice husk biochar may increase weed seedling emergence from deeper burial depths and may decrease the efficacy of some soil-applied herbicides.

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“…The higher weed biomass in the wet season was mainly responsible for the lower yield in the nontreated plots in the wet season. One hand weeding was performed in the nontreated (weedy control) plots because growers in irrigated areas do not leave their rice fields infested with weeds throughout the season [13,14]. Growers use at least one method of weed control.…”

Section: Months (2012)mentioning

confidence: 99%

Fertilizer Placement Affects Weed Growth and Grain Yield in Dry-Seeded Rice (<i>Oryza sativa</i> L.) Systems

Chauhan¹,

Abugho²

2013

AJPS

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A study was conducted in a split-plot design to evaluate the effect of fertilizer placement method on weed growth and grain yield in a dry-seeded rice (DSR) system. Main-plot treatments were four fertilizer placement methods: between narrow rows (between 15-cm-wide rows of the pattern 25-15-25 cm), between uniform rows (between 20-cm-wide rows), within uniform rows, and surface broadcast. Subplot treatments were three weed control methods: herbicide-treated, nontreated, and weed-free. Weed biomass was greater in the nontreated plots than in the herbicide-treated plots. Herbicide application reduced weed biomass by 89% to 99% compared with the nontreated control. Fertilizer placement did not influence weed biomass in the herbicide-treated plots; however, it greatly influenced biomass in the nontreated plots. Fertilizer placement on the surface increased weed biomass (69 -71 g·m -2

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Relations of rice seeding rates to crop and weed growth in aerobic rice

Cited by 101 publications

References 18 publications

E Efficacy and Economics of Herbicidal Weed Management in Monsoon Rice of Bangladesh

E Efficacy and Economics of Herbicidal Weed Management in Monsoon Rice of Bangladesh

Rice Husk Biochar Influences Seedling Emergence of Junglerice (<i>Echinochloa colona</i>) and Herbicide Efficacy

Fertilizer Placement Affects Weed Growth and Grain Yield in Dry-Seeded Rice (<i>Oryza sativa</i> L.) Systems

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Relations of rice seeding rates to crop and weed growth in aerobic rice

Cited by 101 publications

References 18 publications

E Efficacy and Economics of Herbicidal Weed Management in Monsoon Rice of Bangladesh

E Efficacy and Economics of Herbicidal Weed Management in Monsoon Rice of Bangladesh

Rice Husk Biochar Influences Seedling Emergence of Junglerice (&lt;i&gt;Echinochloa colona&lt;/i&gt;) and Herbicide Efficacy

Fertilizer Placement Affects Weed Growth and Grain Yield in Dry-Seeded Rice (&lt;i&gt;Oryza sativa&lt;/i&gt; L.) Systems

Contact Info

Product

Resources

About

Rice Husk Biochar Influences Seedling Emergence of Junglerice (<i>Echinochloa colona</i>) and Herbicide Efficacy

Fertilizer Placement Affects Weed Growth and Grain Yield in Dry-Seeded Rice (<i>Oryza sativa</i> L.) Systems