scholarly journals Performance of Different Herbicides in Dry-Seeded Rice in Bangladesh

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Sharif Ahmed ◽  
Bhagirath Singh Chauhan
Keyword(s):  
Field Study ◽  
Weed Control ◽  
The Other ◽  
Weed Density ◽  
Other Hand ◽  
Hand Weeding ◽  
Density And Biomass ◽  
Preemergence Herbicides

A field study was conducted in the boro season of 2011-12 and aman season of 2012 at Jessore, Bangladesh, to evaluate the performance of sequential applications of preemergence herbicides (oxadiargyl 80 g ai ha−1, pendimethalin 850 g ai ha−1, acetachlor + bensulfuranmethyl 240 g ai ha−1, and pyrazosulfuron 15 g ai ha−1) followed by a postemergence herbicide (ethoxysulfuron 18 g ai ha−1) in dry-seeded rice. All evaluated herbicides reduced weed density and biomass by a significant amount. Among herbicides, pendimethalin, oxadiargyl, and acetachlor + bensulfuranmethyl performed very well against grasses; pyrazosulfuron, on the other hand, was not effective. The best herbicide for broadleaf weed control was oxadiargyl (65–85% control); pendimethalin and acetachlor + bensulfuraonmethyl were not effective for this purpose. The best combination for weed control was oxadiargyl followed by ethoxysulfuron in the boro season and oxadiargyl followed by a one-time hand weeding in the aman season. Compared with the partial weedy plots (hand weeded once), oxadiargyl followed by ethoxysulfuron (4.13 t ha−1) provided a 62% higher yield in the boro season while oxadiargyl followed by a one-time hand weeding (4.08 t ha−1) provided a 37% higher yield in the aman season.

EFFECT OF SEVERAL HERBICIDES ON GERMINATION, SURVIVAL, AND EARLY GROWTH OF CARAGANA AND ON WEEDS

1965 ◽  
Vol 45 (5) ◽  
pp. 477-486
Author(s):  
R. Grover
Keyword(s):  
Weed Control ◽  
Early Growth ◽  
The Other ◽  
Weed Species ◽  
Other Hand ◽  
Weed Seeds ◽  
Caragana Arborescens ◽  
Hand Weeding ◽  
Greenhouse Tests

Several pre-emergence herbicides were tested, both in the greenhouse and in the field, for tolerance to germinating and 1-year-old seedlings of caragana (Caragana arborescens Lam.) and for effectiveness in controlling weeds.Dinoseb (4,6-dinitro-o-sec-butylphenol) and its alkanolamine salt at 8 lb/ac, trifluralin (alpha, alpha, alpha-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) at 4 to 6 lb/ac, DCPA (dimethyl 2,3,5,6-tetrachloroterephthalate) at 15 lb/ac, swep (methyl 3,4-dichlorocarbanilate) at 6 to 9 lb/ac, and Tenoran (N-4-(p-chlorophenoxy)-phenyl-1,1-dimethylurea) at 6 lb/ac gave satisfactory weed control with no injury to germinating caragana seedlings. Liquid formulations of dinoseb or dinoseb-amine were more effective than the granular dinoseb formulation at rates of 8 lb/ac or less. Mixtures of dinoseb, trifluralin, and DCPA were also effective and these may be used where a wider weed species spectrum is encountered.Trifluralin at 6 lb/ac and mixtures of granular dinoseb at 8 to 12 lb/ac with DCPA at 10 lb/ac also provided satisfactory weed control with no injury to 1-year-old caragana seedlings.In the greenhouse tests, pre-emergence applications of trifluralin, diphenamid (N,N-dimethyl-2,2-diphenylacetamide), swep, DCPA, and DMPA (Q-(2,4-dichlorophenyl) O-methyl isopropylphosphoramidothioate) did not retard the germination of weed seeds, but the young weed seedlings were either killed or retarded in growth as the experiments progressed. On the other hand, linuron (3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea), dichlobenil (2,6-dichlorobenzonitrile), and dinoseb affected the emergence of weed seedlings. The weeds surviving the dinoseb treatment grew well. Hand-weeding stimulated the germination of more weed seeds.

scholarly journals Weed Control with Landscape Fabrics

1989 ◽  
Vol 7 (4) ◽  
pp. 129-133 ◽  
Author(s):  
Jeffrey F. Derr ◽  
Bonnie Lee Appleton
Keyword(s):  
Field Study ◽  
Weed Control ◽  
Cyperus Esculentus ◽  
Digitaria Sanguinalis ◽  
Yellow Nutsedge ◽  
Black Plastic ◽  
Hand Weeding ◽  
Preemergence Herbicides ◽  
Large Crabgrass

Abstract Six polypropylene landscape fabrics were compared with black plastic and preemergence herbicides for weed control. Large crabgrass [Digitaria sanguinalis (L.) Scop.] shoots and roots and yellow nutsedge (Cyperus esculentus L.) shoots penetrated all of the fabrics tested and developed into large plants. In greenhouse studies, black plastic plus mulch, and pennant (metolachlor) [2-chloro-N-(2ethyl-6-methylphenyl)-N-(methoxy-1-methylethyl)acetamide] at 4.5 kg ai/ha (4.0 lb/A) plus mulch provided equal, or greater control of large crabgrass than the landscape fabrics. In the field study, more time was required to hand-weed landscape fabrics covered with mulch than uncovered fabrics. When covered with mulch, hand-weeding time and weed shoot fresh weights were similar for black plastic, surflan (oryzalin) [4-(dipropylamino)-3,5-dinitrobenzenesulfonamide] at 2.2 kg/ha (2.0 lb/A), and the landscape fabrics.

Broadleaf weed control in rain-fed chickpea

2019 ◽  
Vol 33 (5) ◽  
pp. 727-732 ◽  
Author(s):  
Saeed Shahbazi ◽  
Marjan Diyanat ◽  
Sareh Mahdavi ◽  
Soheida Samadi
Keyword(s):  
Weed Control ◽  
Yield Response ◽  
Weed Species ◽  
Weed Density ◽  
Wild Mustard ◽  
Herbicide Treatments ◽  
Hoary Cress ◽  
Hand Weeding ◽  
Density And Biomass ◽  
Wild Safflower

AbstractWeeds are among the main limitations on chickpea production in Iran. The efficacy of herbicide treatments including linuron PPI, imazethapyr PPI, PRE, and POST, pendimethalin PPI and POST, bentazon POST, pyridate POST, and oxadiazon POST along with one or two hand weedings were evaluated for weed control and yield response in rain-fed chickpea in Aleshtar, Lorestan, Iran in 2015 and 2016. Wild safflower, threehorn bedstraw, wild mustard, and hoary cress were the predominant weed species in both experimental years. Total weed dry biomass in weedy check plots averaged 187 and 238 g m−2 in 2015 and 2016, respectively, and weed density and biomass were reduced in all treatments compared to the weedy check in both years. Treatments composed of pyridate followed by one hand weeding or imazethapyr POST followed by two hand weedings resulted in the lowest weed biomass. The presence of weeds reduced yield by 74% and 66% in the weedy check plots compared to the weed-free control plots in 2015 and 2016, respectively. Application of oxadiazon, bentazon, and imazethapyr PPI, PRE, and POST resulted in lower chickpea yields. All herbicides tested injured chickpea slightly, with pyridate causing the least injury.

Economical Control of Weeds in Sugarbeets (Beta vulgaris)

Weed Science ◽  
1982 ◽  
Vol 30 (6) ◽  
pp. 620-623 ◽  
Author(s):  
Steven R. Winter ◽  
Allen F. Wiese
Keyword(s):  
Weed Control ◽  
Beta Vulgaris ◽  
Great Plains ◽  
The Other ◽  
Kochia Scoparia ◽  
Total Cost ◽  
Southern Great Plains ◽  
Weed Density ◽  
Other Hand

Economical combinations of herbicides and hand labor for weeding sugarbeets (Beta vulgarisL.) in high and low weed densities were determined for irrigated production in the southern Great Plains. Ethofumesate [(±)-2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonate] preplant incorporated, a 50:50 mixture of phenmedipham (methylm-hydroxycarbanilatem-methylcarbanilate) and desmedipham (ethylm-hydroxycarbanilate carbanilate (ester)] sprayed postemergence on small weeds, and trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) incorporated at layby controlled pigweed (Amaranthusspp.) and kochia [Kochia scoparia(L.) Schrad.] with acceptable selectivity in sugarbeets. Sucrose yield was identical for all methods of weed control. Using herbicides did not lower, and in some cases doubled, the total cost of weed control in an area with a low weed density. On the other hand, effective herbicide combinations saved $298 to $966/ha compared to total reliance on hand labor in an area with a high weed density. Elaborate combinations of herbicides were not justified even with heavy weed density. The last few weeds remaining in a field can be most economically removed by hand labor.

The Effect of Trifluralin Applied Preplant on Grass Weed Control and Establishment and Yield of Barley (Hordeum vulgare)

1997 ◽  
Vol 11 (3) ◽  
pp. 515-519 ◽  
Author(s):  
Julio A. Scursoni ◽  
Emilio H. Satorre
Keyword(s):  
Weed Control ◽  
Field Experiments ◽  
Herbicide Application ◽  
Planting Pattern ◽  
Weed Density ◽  
Time Of Application ◽  
Density And Biomass ◽  
And Control ◽  
Crop Planting ◽  
Grass Weed

The objective of this paper was to evaluate the effect of preplant applications of trifluralin on barley stand and yield, and control of grass weeds in field experiments during 1992 and 1993. Factors examined were: (1) crop planting patterns (conventional drill with rows 15 cm apart and deep-seeder drill with rows 25 cm apart), (2) herbicide application times (22 d before sowing and immediately before sowing), and (3) herbicide application. During 1993, hand-weeded plots also were established. Trifluralin applied preplant at 528 g ai/ha reduced weed density and biomass. Weed control was higher under conventional planting than under the deep planting pattern, and there was no effect of the time of application on herbicide efficacy. There was no herbicide injury to the crop, and grain yield was higher in treated than in untreated plots due to successful weed control.

Effect of herbicides and herbicide mixtures on weeds in wheat

2016 ◽  
Vol 50 (2) ◽  
Author(s):  
Dhirender Choudhary ◽  
P. K. Singh ◽  
N. K. Chopra ◽  
S. C. Rana
Keyword(s):  
Triticum Aestivum ◽  
Weed Control ◽  
Harvest Index ◽  
Dry Weight ◽  
Field Investigation ◽  
Weed Density ◽  
Metsulfuron Methyl ◽  
Weed Control Efficiency ◽  
Herbicide Mixtures ◽  
Hand Weeding

A field investigation was carried out to evaluate the effect of herbicides and their mixtures on weeds in wheat (<italic>Triticum aestivum</italic> L.) cv. PBW-343. Minimum weed density per m<sup>2</sup> and weed dry weight (5.13 and 17.31g) was recorded with sulfosulfuron at 25g ha<sup>−1</sup> followed by clodinofop at 60g + metsulfuron methyl at 4g ha<sup>−1</sup> (5.19 and 18.45g), metribuzin at 200gha<sup>−1</sup>(5.85 and 25.98g), pendimethalin at 1000g fb 2,4-Dat400g ha<sup>−1</sup> (6.49 and 31.73g) and hand weeding twice(7.01 and 35g), respectively. Also, maximum weed control efficiency was recorded under sulfosulfuron at 25g ha<sup>−1</sup> (83.85%) followed by clodinofop at 60g + metsulfuron methyl at 4g ha<sup>−1</sup> (83.17%) and metribuzin at 200g ha<sup>−1</sup> (75.85%), respectively. All the weed control treatments recorded significantly higher harvest index than the weedy check (40.24). Among various herbicidal treatments, application of clodinofop at 60g + metsulfuron methyl at 4g ha<sup>−1</sup> recorded highest harvest index (41.91) followed by sulfosulfuron at 25 gha<sup>−1</sup> (41.83) and pendimethalin at 1000g fb2,4-Dat 400gha<sup>−1</sup> (41.25) respectively. The harvest index recorded under clodinofop at 60g + metsulfuron methyl at 4g ha<sup>−1</sup> and sulfosulfuron at 25 g ha<sup>−1</sup> was significantly at par with weed free (42.06).

scholarly journals Effect of water management and weed control treatments on the performance of transplanted aman rice

1970 ◽  
Vol 33 (3) ◽  
pp. 399-408 ◽  
Author(s):  
MH Kabir ◽  
MN Bari ◽  
M Moynul Haque ◽  
GJU Ahmed ◽  
JMS Islam
Keyword(s):  
Water Management ◽  
Grain Yield ◽  
Weed Control ◽  
Management Practices ◽  
Weed Biomass ◽  
Weed Density ◽  
Control Efficiency ◽  
Free Treatment ◽  
Weed Control Efficiency ◽  
Hand Weeding

A study was conducted from June to December 2003 to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39) in different weed control treatments e.g. two hand weedings at 15 and 40 DAT; Weeding by BRRI Weeder at 20 and 40 DAT; Rifit 500EC @ 1L/ha at 7 DAT; Rifit 500EC @ 1 L/ha at 7 DAT and one hand weeding at 40 DAT; Butachlor 5G @ 2 kg/ha at 7 DAT; Butachlor 5G @ 2 kg/ha at 7 DAT and one hand weeding at 40 DAT along with weed free and unweeded check under both good and poor water management practices. Weed density, weed biomass and weed control efficiency were significantly influenced by different weed control treatments under both water management practices. Other than weed free treatment, Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DAT showed the best performance under good water management with minimum weed density (16 g/m2) as well as weed biomass (9.27 g/m2) and the highest weed control efficiency (82.57%). Yield and yield components were also significantly influenced by different weed control treatments and water management. The highest grain yield (5.22 t/ha) was obtained under good water management in weed free treatment followed by Butachlor 5G @ 2 kg/ ha and one hand weeding (4.96 t/ha) under same water management. Results revealed that integration of approaches, particularly Butachlor application along with one manual weeding accompanied by proper water management might be the best option to combat weed problems as well as to obtain satisfactory grain yield in transplanted aman rice. Key Words: Transplanted aman rice, water management, weed control treatment and yield. doi:10.3329/bjar.v33i3.1599 Bangladesh J. Agril. Res. 33(3) : 399-408, September 2008

Effects of Imported Technology on Iranian Architecture

2012 ◽  
Vol 174-177 ◽  
pp. 1966-1970
Author(s):  
Mohammad Reza Maghareh ◽  
Mohammad Aliabadi ◽  
Maryam Dastgheib Parsa
Keyword(s):  
Field Study ◽  
The Other ◽  
Past Century ◽  
Fars Province ◽  
Cultural Backgrounds ◽  
The Past ◽  
Other Hand ◽  
Negative Effect ◽  
Engineering Organization

In order to study the effects of imported technology on Iranian architecture, a field study was conducted according to the views of architects and engineers involved in construction activities. At first, the literature subject was reviewed, then, the technology indexes, that affect the architecture, were identified. A questionnaire was prepared to recognize their effects, and ninety architects and engineers of Engineering Organization of Fars Province were surveyed. In this paper, the methodology of determination and prioritization of the indexes are studied and; the results of six indexes are discussed. According to the results, five of the indexes are negative. It is found that, lack of attention to the harmony between imported technology and social and cultural backgrounds has the most negative effect on the Iranian architecture during the past century. On the other hand buying and transferring professional imported technologies has been positive based on the participants’ idea.

scholarly journals Effects of weed control through cowpea intercropping on mayze morphology and yield

2007 ◽  
Vol 25 (3) ◽  
pp. 433-441 ◽  
Author(s):  
J.K.O. Gomes ◽  
P.S.L. Silva ◽  
K.M.B. Silva ◽  
F.F. Rodrigues Filho ◽  
V.G. Santos
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Control Method ◽  
The Other ◽  
Weed Species ◽  
Mean Values ◽  
Maize Cultivars ◽  
Poaceae Family ◽  
Maize Yields ◽  
Hand Weeding

Intercropping combined with competitive maize cultivars can reduce the use of herbicides to control weeds. The objective of this work was to evaluate the effects of intercropping cowpea and maize, as well as hand-weeding on maize morphology and yield. The experimental design was in randomized complete blocks, with treatments arranged in split-plots and five replications. The plots consisted of four maize cultivars (BA 8512, BA 9012, EX 4001, EX 6004) and the split-plots consisted of the following treatments: no-weeding; twice hand-weeding (20 and 40 days after sowing); and intercropping with cowpea ('Sempre Verde' cultivar), both maize and cowpea sown at the same time. The variables evaluated were: maize fresh green ears and grain yield; characteristics of internodes, leaves, tassels, ears, grains; plant height and ear insertion height; number of weed plants and species; fresh and dry biomass of weed species and cowpea. Ten weed species were outstanding during the experiment, many of them from the Poaceae family. No interactions were found between weed control method and maize cultivars for most variables evaluated; and plants from hand-weeded split-plots showed superior mean values compared to plants from non-weeded and intercropped split-plots, both not differing from each other. The cowpea was inefficient in controlling weed, reducing the maize yields and not producing any grain. The maize cultivars 'BA 8512' and 'BA 9012 showed the highest mean green ear yield, and the highest grain yield in hand-weeded, no-weeded and intercropped split-plots. On the other hand, the maize cultivar 'EX 6004' showed such high means only in no-weeded and intercropped split-plots. 'EX 4001 presented the worst means in these variables for hand-weeded, no-weeded ant intercropped split-plots.

Weed management in white beans with postemergence herbicide tankmixes

2013 ◽  
Vol 93 (4) ◽  
pp. 669-674 ◽  
Author(s):  
Nader Soltani ◽  
Robert E. Nurse ◽  
Peter H. Sikkema
Keyword(s):  
Adverse Effect ◽  
Weed Control ◽  
Weed Management ◽  
Field Studies ◽  
Control Efficacy ◽  
Weed Density ◽  
Herbicide Treatments ◽  
White Bean ◽  
Effect On Yield ◽  
Density And Biomass

Soltani, N., Nurse, R. E. and Sikkema, P. H. 2013. Weed management in white beans with postemergence herbicide tankmixes. Can. J. Plant Sci. 93: 669–674. Weed control efficacy of cloransulam-methyl, halosulfuron, bentazon, fomesafen and their tankmixes applied post-emergence (POST) for weed management in white bean was evaluated in field studies conducted in four Ontario locations during 2008–2011. Cloransulam-methyl, halosulfuron, bentazon, fomesafen, bentazon plus fomesafen, cloransulam-methyl plus bentazon, cloransulam-methyl plus fomesafen, cloransulam-methyl plus bentazon plus fomesafen, halosulfuron plus bentazon, halosulfuron plus fomesafen, and halosulfuron plus bentazon plus fomesafen caused white bean injury ranging from 1 to 18%. Control for AMARE, AMBEL and CHEAL ranged from 47 to 92%, 66 to 98% and 36 to 91%, respectively, among herbicide treatments. Similar results were observed for weed density and biomass of AMARE, AMBEL, and CHEAL. Cloransulam-methyl, halosulfuron, and cloransulam-methyl plus fomesafen reduced the yield of white bean by 34, 21, and 17%, respectively, compared with the weed-free control. However, bentazon, fomesafen, bentazon plus fomesafen, cloransulam-methyl plus bentazon, cloransulam-methyl plus bentazon plus fomesafen, halosulfuron plus bentazon, halosulfuron plus fomesafen, and halosulfuron plus bentazon plus fomesafen had no adverse effect on yield of white bean. Based on these results, tankmixes of cloransulam-methyl and halosulfuron with bentazon and fomesafen can reduce crop injury and provide control of broadleaf weeds in white bean.

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