Effect of Method of Seeding and Weed Control on Weed Growth and Yield of Two Rice Crops Grown in Sequence

1980 ◽  
Vol 26 (3) ◽  
pp. 303-308 ◽  
Author(s):  
N. U. Ahmed ◽  
K. Moody
Keyword(s):  
Weed Control ◽  
Growth And Yield ◽  
Weed Growth

Weed management options in transgenic stacked and non transgenic maize (Zea mays) hybrids-A review

2017 ◽  
Vol 38 (04) ◽  
Author(s):  
K. Sivagamy ◽  
C. Chinnusamy ◽  
P. Parasuraman
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Crop Growth ◽  
Control Programme ◽  
Growth And Yield ◽  
Growth Stages ◽  
Management Options ◽  
Maize Crop ◽  
Weed Growth ◽  
Vigorous Growth

Weeds are generally hardy species having fast growth, deep root system and capable of competing very efficiently with cultivated crops for the available resources and adversely affect the crop growth and yield. Weed management systems that rely on post emergence control assume that crops can tolerate competition for certain periods of time without suffering yield losses. Initial slow growth particularly at early crop growth stages and wider plant spacing of maize crop encourages fast and vigorous growth of weeds. It is of paramount importance that, competition from weeds must be minimized to achieve optimum yield. Among the different weed control methods, chemical method bears many advantages in suppressing weed growth and to get healthy and vigorous crop stand. Non-selective herbicide molecules with a variety of mode of action were discovered, developed and marketed for successful weed control programme.

scholarly journals Response of onion (Allium cepa L.) to plant population and weed control methods in a chicken weed (Portulaca quadrifida L.) infested field In Sudan Savanna, Nigeria

2021 ◽  
Vol 20 (1) ◽  
pp. 19-27
Author(s):  
Y. Garba
Keyword(s):  
Weed Control ◽  
Block Design ◽  
Plant Population ◽  
Growth And Yield ◽  
Control Methods ◽  
Weed Species ◽  
Pooled Data ◽  
Weed Growth ◽  
Infested Field ◽  
Sudan Savanna

Chicken weed is a significant weed in India and it occurs under onion cultivated field at Birnin Kebbi in the Sudan Savannah, Nigeria. On-farm experiment was conducted at Birnin Kebbi during the 2017/2018 and 2018/2019 dry season to evaluate the effect of plant population and weed control methods on the management of chicken weed (Portulaca quadrifida) alongside other weeds in onion field. The experiment consisted of three plant populations (500,000, 333,333 and 250,000 plants per hectare) and twelve weed control methods (Pendimethalin at 1.0 kg a.i. ha-1, + 1Hw; pendimethalin at 1.5 kg a.i. ha-1 + fluazifop-p-butyl at 2.0 kg a.i. ha-1; pendimethalin at 2.0 kg a.i. ha-1; butachlor at 2.0 kg a.i. ha-1 + 1Hw; butachlor at 2.8 kg a.i. ha-1 + oxyfluorfen at 1.0 kg a.i. ha-1; butachlor at 3.6 kg a.i. ha-1; fluazifop-p-butyl at 2.0 kg a.i. ha-1; oxyfluorfen at 1.0 kg a.i. ha-1 + 1Hw; hoe weeding at 3 (WAT); hoe weeding at 3 and 6 WAT; weed free and weedy check). The experiment was laid out in a randomized complete Block design replicated three times. Results showed that weed, growth and yield parameters were not significantly affected by plant population. Pendimethalin at 1.5 kg a.i. ha-1 + fluazifop-p-butyl at 2.0 kg a.i. ha-1 and weed free plots consistently recorded the lowest weed cover and highest weed control efficiency. Butachlor at 2.0 kg a.i. ha-1 + 1 Hw recorded the lowest crop injury score. Increase in plant height was observed when pendimethalin at 1.0 and 1.5 kg a.i. ha-1 + 1 Hw and fluazifop-p-butyl at 2.0 kg a.i. ha-1 respectively was applied, while application of pendimethalin at 2.0 kg a.i. ha-1 and butachlor at 2.0 kg a.i. ha-1 + 1 Hw recorded highest number of leaves and leaf area. Cured bulb and marketable bulb yield were greater with the use of pendimethalin and butachlor at 1.0 and 1.5 kg a.i. ha-1 + 1 Hw and the pooled data respectively. Application of pendimethalin and butachlor at the rate of 1.0 and 2.0 kg a.i. ha-1 followed by 1 Hw at 6 WAT respectively was therefore recommended for the control of chicken weed alongside other weed species in the ecology

scholarly journals Effect of Weed Management Practices on Weed Growth and Yield of Greengram (Vigna radiata (L.) Wilczek) in Southern Rajasthan

2020 ◽  
pp. 12-19
Author(s):  
Arvind Verma ◽  
Roshan Choudhary
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Management Practices ◽  
Green Gram ◽  
Growth And Yield ◽  
Leaf Stage ◽  
Net Returns ◽  
Weed Growth ◽  
Hand Weeding ◽  
The Impact

A Field experiment was conducted at Agronomy instructional Farm, Rajasthan College of Agriculture, MPUAT, Udaipur (Rajasthan) during 2016-17 to find out the impact of new generation herbicides in green gram.  The results revealed that all growth and yield characters of blackgram were significantly affected by distinct weed control practices. A similar trend was also observed in weed parameters. Higher seed yield (13.8 qha-1) and higher weed control efficiency (88.97%) were recorded under application of acifluorfen sodium + clodinafop propargyl (370 g a.i. ha-1) at 3-4 leaf stage and which comparable with pre-emergence application of pyroxasulfone +pendimethalin (TM) 127.5+1000 g a.i/ha, imazethapyr+ quizalofop (TM) use at 70 + 60 g a.i/ha at 3-4 leaf stage, imazethapyr 70 g a.i/ha 3-4 leaf stage, imazethapyr + imazamox (RM) use at 70 g a.i/ha at 3-4 leaf stage, pendimethalin fb quizalofop 1000 + 60 at pre-emergence & 3- 4 leaf stage, imazethapyr + pendimethalin (RM) 1000 g a.i/ha as pre-emergence, propaquizfop 75 g a.i/ha at 3-4 leaf stage, weedy check and two hand weeding twice at 20 & 40 DAS. They also recorded improvement in yields and net returns by 65.22% over weedy check. These herbicide ready-mixes may be a promising weed management strategy for the green gram grown in the Southern Rajasthan.

scholarly journals Phytotoxic Effect of Herbicides with and without Surfactant on Weed Growth and Yield of Wheat

1999 ◽  
Vol 4 (2) ◽  
pp. 35
Author(s):  
A. Tanveer ◽  
M. Ayub ◽  
A. Ali ◽  
R. Ahmad
Keyword(s):  
Acetic Acid ◽  
Grain Yield ◽  
Weed Control ◽  
Growth And Yield ◽  
Weed Growth ◽  
Phytotoxic Effect ◽  
Dimethyl Urea ◽  
Methyl Phenyl

Use of surfactants is an effective mean of improving herbicide efficiency. The herbicides methabenzthiazuron [l ,3-Dimethyl-3-(2-benzothiazolyl)urea], chlortoluron[N-(3, Chloro-4-methyl phenyl)-N-N-dimethyl urea] + MCPA(2-Methyl-4-chlorophenoxy acetic acid] and lsoproturon [3-(4-isopropylphenyl)-1, 1-dimethyl urea] were evaluated for weed control at recommended rates of 1.26, 1.50 and 0.97 a.i. kg ha-1, respectively, in comparison with a 12.5 and 25% less rate after the addition of 0.2 % surfactant. Application of herbicides with surfactant even at lower rates was as effective as recommended rates in controlling weeds and increasing grain yield. Grain yield ranged from 20.8 to 45.3 % and 26.3 to 38.1 % more than the weedy check in 1992-93 and 1993-94, respectively, for various herbicide concentrations. Thus for economical weed control, a lower rate of herbicide with the addition of surfactant should be recommended.

INFLUENCE OF INTER-ROW SPACING AND WEED CONTROL METHODS IN GROUNDNUT (Arachis hypogeal (L.)

2017 ◽  
Vol 16 (1) ◽  
pp. 86-95
Author(s):  
J. A. ADIGUN ◽  
O. R. ADEYEMI ◽  
S. T. O., LAGOKE ◽  
P. M. OLORUNMAIYE ◽  
O. S. DARAMOLA ◽  
...  
Keyword(s):  
Weed Control ◽  
Crop Production ◽  
Field Trials ◽  
Growth And Yield ◽  
Row Spacing ◽  
Control Methods ◽  
Weed Growth ◽  
Need To Evaluate ◽  
Weed Infestation ◽  
Main Plot

Weed competition has been identified as one of the major obstacles in crop production. The produc-tion of groundnut is limited by high weed infestation resulting in yield losses ranging from 50 - 80% in Nigeria. Hence, the need to evaluate integrated weed control in its production. Field trials were there-fore conducted at the Teaching and Research Farm of the Federal University of Agriculture, Abeokuta (7o 20’ N, 30 23’ E) to evaluate the influence of inter-row spacing and weed control methods on growth and yield of groundnut during the wet seasons in 2009 and 2010. The experiment was a Randomised Complete Design (RCBD) laid out in a split plot with three replications. The main plot treatment con-sisted of three inter-row spacings of 60 cm, 75 cm and 90 cm while the subplots included five weed control treatments of commercial formulation of metolachlor plus promethyne mixture (codal) at 1.0 kg a.i/ha, codal at 1.0 kg a.i./ha followed by supplementary hoe weeding at 6 weeks after sowing (WAS), codal at 2 kg a.i./ha, hoe weeding at 3, 6 and 9 WAS and a weedy check. Inter-row spacings of 60 cm and 75 cm reduced weed growth with consequent higher yields compared to the inter-row spacings of 90 cm in the early season of 2009. Application of codal at 1.0 kg a.i./ha followed by supplementary hoe weeding at 6 WAS combined with 60cm inter-row spacing gave effective weed control and higher groundnut pod yield than hoe-weeded control in both years of experimentation.

scholarly journals Response of cowpea (Vigna unguiculata, L., Walp) to inter-row spacing and weed competition

2020 ◽  
Vol 53 (2) ◽  
pp. 73-79
Author(s):  
Joseph Aremu Adigun ◽  
Olusegun Raphael Adeyemi ◽  
Olumide Samuel Daramola ◽  
Patience Mojibade Olorunmaiye
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Field Trials ◽  
Growth And Yield ◽  
Row Spacing ◽  
Subsequent Increase ◽  
Weed Density ◽  
Weed Growth ◽  
Major Factors ◽  
Density And Biomass

AbstractWeed infestation is one of the major factors attributed for the poor yield of cowpea in Nigeria and other parts of sub-Sahara Africa (SSA). Field trials were therefore conducted to evaluate the effect of row spacing and different weeding levels on weed control, growth and yield of cowpea during the early and late wet seasons of 2009. In both seasons, the use of 60 cm row spacing resulted in significant (P < 0.05) reduction in weed density by 18 – 39% and weed biomass by 17 – 27% with subsequent increase in cowpea growth and grain yield than 75 and 90 cm row spacing. Cowpea grain yield increased by 67 – 109% in the early season and 24 – 56% in the late season at 60 compared to 75 and 90 cm row spacing. Hoe weeding reduced weed growth significantly in both seasons with the lowest weed density and biomass recorded in plots weeded thrice. However, this was not significantly different from weed density and biomass recorded with two weedings in both seasons. Hoe weeding twice resulted in optimum growth and grain yield of cowpea. An additional weeding, however, did not improve cowpea growth and yield in both seasons. The results of this study showed that narrow (60 cm) inter-row spacing and two hoe weedings at 3 and 6 weeks after sowing (WAS) will improve weed control and productivity of cowpea. Additional weeding is considered superfluous.

scholarly journals Weed control in corn and weed sample size for growth evaluations

2014 ◽  
Vol 32 (1) ◽  
pp. 51-59 ◽  
Author(s):  
L.B. Tavella ◽  
P.S.L. Silva ◽  
V.R. Oliveira ◽  
P.L.O. Fernandes ◽  
R.P. Sousa
Keyword(s):  
Grain Yield ◽  
Sample Size ◽  
Weed Control ◽  
Block Design ◽  
Corn Yield ◽  
Weed Growth ◽  
Randomized Block Design ◽  
Experimental Variation ◽  
Yield Values ◽  
Viable Seeds

The objectives of this study were to evaluate baby corn yield, green corn yield, and grain yield in corn cultivar BM 3061, with weed control achieved via a combination of hoeing and intercropping with gliricidia, and determine how sample size influences weed growth evaluation accuracy. A randomized block design with ten replicates was used. The cultivar was submitted to the following treatments: A = hoeings at 20 and 40 days after corn sowing (DACS), B = hoeing at 20 DACS + gliricidia sowing after hoeing, C = gliricidia sowing together with corn sowing + hoeing at 40 DACS, D = gliricidia sowing together with corn sowing, and E = no hoeing. Gliricidia was sown at a density of 30 viable seeds m-2. After harvesting the mature ears, the area of each plot was divided into eight sampling units measuring 1.2 m² each to evaluate weed growth (above-ground dry biomass). Treatment A provided the highest baby corn, green corn, and grain yields. Treatment B did not differ from treatment A with respect to the yield values for the three products, and was equivalent to treatment C for green corn yield, but was superior to C with regard to baby corn weight and grain yield. Treatments D and E provided similar yields and were inferior to the other treatments. Therefore, treatment B is a promising one. The relation between coefficient of experimental variation (CV) and sample size (S) to evaluate growth of the above-ground part of the weeds was given by the equation CV = 37.57 S-0.15, i.e., CV decreased as S increased. The optimal sample size indicated by this equation was 4.3 m².

scholarly journals (220) Pelargonic Acid Weed Control Parameters

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1034D-1034 ◽  
Author(s):  
Charles L. Webber ◽  
James W. Shrefler
Keyword(s):  
Weed Control ◽  
Field Research ◽  
Pelargonic Acid ◽  
Nonanoic Acid ◽  
Ionic Surfactant ◽  
Application Timing ◽  
Weed Growth ◽  
Time Period ◽  
Visual Damage ◽  
Multiple Species

Producers and researchers are interested in pelargonic acid (nonanoic acid) as a broad-spectrum postemergence or burn-down herbicide. Pelargonic acid is a fatty acid naturally occurring in many plants and animals, and present in many foods we consume. The objective of this research was to determine the effect of pelargonic acid concentration, adjuvants, and application timing on weed control efficacy as a burn-down herbicide. Field research was conducted at Lane, Okla. (southeast Oklahoma), during the 2005 growing season. One month prior to spraying the weed control treatments, the land was cultivated to kill the existing weeds and provide a uniform seed bed for new weed growth. The factorial weed control treatments included three application concentrations of Scythe (57.0% pelargonic acid) applied at 3%, 6.5%, and 10%; three adjuvants (none, orange oil, and non-ionic surfactant); and two application dates. All herbicide treatments were applied with an application volume of 935 L/ha to seedling weeds. The experiment had a high weed density with multiple species of grass and broadleaf weeds. Weed control across species increased as the herbicide concentrations increased from 0% to 10%. At all concentrations applied, pelargonic acid produced greater weed control for a longer time period for the broadleaf weeds than the grass weeds. Visual damage to the weeds was often apparent within a few hours after application. There was a significant increase in weed control when applied to the younger weeds. In this research, pelargonic acid was effective in controlling both broadleaf and grass weeds as a burn-down herbicide, although crabgrass was tougher to control.

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