scholarly journals Weed control and productivity of maize (Zea mays L.) in Malete, Kwara State of Nigeria

2020 ◽  
Vol 53 (2) ◽  
pp. 63-71
Author(s):  
Emmanuel Oyamedan Imoloame
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Control Method ◽  
Block Design ◽  
Field Trials ◽  
State University ◽  
Application Rates ◽  
Hand Weeding ◽  
Statistical Analysis Software ◽  
Range Test

AbstractThe need to determine the minimum application rates of commonly used herbicides in Malete and the Guinea savanna of Nigeria for effective weed control and higher grain yield of maize, triggered this study. Therefore, field trials were conducted at the Teaching and Research Farm of Kwara State University, Malete, to determine the weed control method that will be more effective in controlling weeds and give higher grain yield and cash returns in the production of maize. The experiment consisted of 9 treatments viz: primextra (metolachlor plus atrazine) + 2,4-D at 1.5 + 1.5 kg active ingredient (a.i.).ha−1, primextra + 2,4-D at 2.0 + 2.0 kg a.i. ha−1, primextra + 2,4-D at 2.5 + 2.5 kg ha−1, primextra + nicosulfuron at 1.5 + 0.03 kg a.i. ha−1, primextra + nicosulfuron at 2.0 + 0.05 kg a.i. ha−1, primextra + niconsulfuron at 2.5 + 0.07 kg a.i. ha−1, primextra at 1.5 kg a.i. ha−1 + one Supplementary Hoe Weeding (SHW) at 6 Weeks After Sowing (WAS), two hand weeding at 3 and 6 Weeks After Sowing (WAS) and a weedy check. These treatments were laid out in randomised complete block design (RCBD) with three replicates. Data collected were subjected to analysis of variance using Statistical Analysis Software (SAS) package, after which means were separated using Duncan’s Multiple Range Test (DMRT). Results showed that treatment combinations of primextra + one SHW at 6 WAS, two hoe weeding at 3 and 6 WAS, primextra + 2,4-D at 2.0 + 2.0 kg a.i. ha−1 and primextra + nicosulfuron at 2.0+0.05 kg a.i. ha−1 gave effective weed control, higher grain yield and cash returns. Therefore, primextra at 1.5 kg a.i. ha−1 + one SHW at 6 WAS, primextra +2,4-D at 2.0 + 2.0 kg a.i. ha−1 and primextra + nicosulfuron at 2.0 + 0.05 kg a.i. ha−1 are recommended to farmers as alternative to two hoe weeding at 3 and 6 WAS.

scholarly journals Weed control and productivity of maize (Zea mays L.)

2020 ◽  
Vol 65 (2) ◽  
pp. 121-136
Author(s):  
Emmanuel Imoloame
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Zea Mays L ◽  
Control Method ◽  
Block Design ◽  
Field Trials ◽  
State University ◽  
Randomized Complete Block Design ◽  
Statistical Analysis Software ◽  
Range Test

Field trials were conducted at the Teaching and Research Farm of Kwara State University, Malete, to determine the weed control method that will be more effective in controlling weeds and give higher grain yield and cash returns in the production of maize. The experiment consisted of 9 treatments: Primextra + Aminicome at 1.5 + 1.5 kg ha-1 (metolachlor 375 g a.i. ha-1 + atrazine 375 g a.i. ha- 1 + 2,4 - D 900 g a.i. ha-1), Primextra + Aminicome at 2.0 + 2.0 kg ha-1 (metolachlor 500 g a.i. ha-1 + atrazine 500 g a.i. ha-1 + 2,4 - D 1200 g a.i. ha-1), Primextra + Aminicome at 2.5 + 2.5 kg ha-1 (metolachlor 750 g a.i. ha-1 + atrazine 750 g a.i. ha-1 + 2,4 - D 1500 g a.i. ha-1), Primextra + Guard force at 1.5 + 0.03 kg ha-1 (metolachlor 375 g a.i. ha-1 + atrazine 375 g a.i. ha-1 + nicosulfuron 1.2 g a.i. ha-1 ), Primextra + Guard force at 2.0 + 0.05 kg ha-1 (metolachlor 500 g a.i. ha-1 + atrazine 500 g a.i. ha-1 + nicosulfuron 2.0 g a.i. ha-1), Primextra + Guard force at 2.5 + 0.07 kg ha-1 (metolachlor 750 g a.i. ha-1 + atrazine 750 g a.i. ha-1 + nicosulfuron 2.8 g a.i. ha-1), Primextra at 1.5 kg ha-1 (metolachlor 375 g a.i. ha-1 + atrazine 375 g a.i. ha-1) + one supplementary hoe weeding (SHW) at 6 weeks after sowing (WAS), two hand weedings at 3 and 6 weeks after sowing (WAS) and a weedy check. These treatments were laid out in a randomized complete block design (RCBD) with three replicates. Data collected were subjected to analysis of variance using the Statistical Analysis Software (SAS) package, after which means were separated using Duncan?s Multiple Range Test (DMRT). Results showed that treatment combinations of Primextra at 1.5 Kg ha-1 + one SHW at 6 WAS, two hoe weedings at 3 and 6 WAS, Primextra + Aminicome at 2.0 + 2.0 kg ha-1 and Primextra + Guard force at 2.0 + 0.05 kg ha-1 gave effective weed control, higher grain yield and cash returns. They are therefore recommended for application in rotation by farmers in Malete.

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.

scholarly journals Performance Evaluation of BRRI Power Weeder for Low Land Rice (Oryza sativ L.) Cultivation

2017 ◽  
Vol 15 (1) ◽  
pp. 40-48
Author(s):  
AKM Saiful Islam ◽  
MT Islam ◽  
M Sh. Islam ◽  
AKM Lutfor Rahman ◽  
MA Rahman
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Crop Production ◽  
Block Design ◽  
Rice Variety ◽  
Field Performance ◽  
Field Capacity ◽  
Control Device ◽  
Effective Field ◽  
Hand Weeding

Mechanical intervention in crop production is increasing rapidly in Bangladesh. Researchers are finding ways to manage weeds in rice field using suitable mechanical devices instead of conventional hand weeding. A study was conducted to evaluate the field performance of BRRI (Bangladesh Rice Research Institute) power weeder compared to BRRI weeder and hand weeding in the farmers’ field at Rashidpur in Mithapukur upazila under Rangpur district during boro season of 2014-15. Three treatments: T1 = BRRI weeder (BW), T2 = BRRI power weeder (BPW) and T3 = Hand weeding (HW) were used in the experiment. The experiment was carried out in a randomized complete block design (RCBD) and replicated in four farmers’ plots. Rice variety BRRI dhan28 was selected for the experiment. The effective field capacity of BW and BPW was found to be 0.06 and 0.09 ha hr-1, respectively. The weeding efficiency was the highest in HW (92%), followed by BPW (78%) and BW (73%). It was found that BW damaged the lowest number of plants (9%) compared to BPW (11%) during weeding operation, although the damaged plants recovered after a few days. BW and BPW reduced 74 and 85% of labor requirement in weeding operation compared to HW. The highest weeding cost was involved in HW (Tk. 4287 ha-1) compared to BW (Tk. 1103 ha-1) and BPW (Tk. 950ha-1). Weed control methods exerted insignificant effect on grain yield. BRRI power weeder and BRRI weeder reduced weeding cost, enhanced weed control and improved the labor efficiency without sacrificing grain yield. The highest BCR was obtained in BPW (1.22) followed by BW (1.16) and HW (1.11). BRRI power weeder and BRRI weeder appeared to be economic, easy and also environmentally safe weed control device in low land rice cultivation. The Agriculturists 2017; 15(1) 40-48

scholarly journals Weed control efficacy of hoe weeding and commercially formulated mixture of metolachlor + prometryn herbicide under maize production in soil amended with biochar

2019 ◽  
Vol 52 (2) ◽  
pp. 73-78
Author(s):  
Olusegun Raphael Adeyemi ◽  
David Obaloluwa Hosu ◽  
Patience Mojibade Olorunmaiye ◽  
Adeniyi Adebowale Soretire ◽  
Joseph Aremu Adigun ◽  
...  
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Block Design ◽  
Maize Yield ◽  
Field Trials ◽  
Growth And Yield ◽  
Control Methods ◽  
Maize Production ◽  
Randomized Design ◽  
Manual Weeding

Abstract Successful cultivation of maize depends largely on efficient weed control, adequate supply of essential nutrients and sufficient soil moisture. Screenhouse and field trials were conducted at the Teaching and Research Farm of the Federal University of Agriculture, Abeokuta, Nigeria during the early and late cropping season of 2013 to evaluate effects of biochar integrated with manual weeding and pre-emergence herbicides on weed control efficiency and productivity of maize. The screenhouse trial was a 6 × 5 factorial experiment fitted into Completely Randomized Design in three replicates. The two factors were biochar: 0, 2, 4, 6, 8 and 10 t ha−1 and weed control methods: weedy check, hoe weeding at 6 Weeks After Sowing (WAS), hoe weeding at 3, 6, and 9 WAS, pre-emergence herbicide application (Codal Gold) at 1.0 and 2.0 kg a.i./ha−1. The field trial was laid out in split-plot arrangement fitted into Randomized Complete Block Design with three replicates. The three main treatments plots on the field consisted of the optimum rates of biochar obtained in the screenhouse (10 t ha−1) compared with 20 t ha−1 and 0 t ha−1 which served as the control. The sub-plots treatments consisted of weed control methods used in the screen house experiment. Data were collected on grain yield and weed dry matter. The result showed that biochar at 10 and 20 t ha−1 in the screenhouse and field trials, respectively, resulted in significantly (P < 0.05) higher grain yield compared with other rates tested. Highest grain yield was obtained in pots hoe weeded thrice at 3, 6 and 9 WAS. Whereas similar grain yield was recorded in plot weeded once at 6 WAS and that hoe weeded at 3, 6 and 9 WAS in the field experiment. Biochar application of 20 t ha−1 gave optimum maize yield. Among the weed control treatments manual weeding either at 6 WAS or at 3, 6 and 9 WAS recorded the highest grain yields. Therefore, incorporation of biochar with either preemergence herbicide or manual hoe weeding would enhance the growth and yield of maize.

Interactive Effects of Hand Weeding, Tine and Sweep Cultivation for Weed Control in Organic Peanut Production

2014 ◽  
Vol 41 (2) ◽  
pp. 124-130 ◽  
Author(s):  
D. Q. Wann ◽  
R. S. Tubbs
Keyword(s):  
Weed Control ◽  
Control Method ◽  
Field Trials ◽  
Interactive Effects ◽  
Weed Species ◽  
Peanut Crop ◽  
Peanut Production ◽  
Amaranthus Spp ◽  
Hand Weeding ◽  
Organically Managed

ABSTRACT Previous research has shown that mechanical cultivation is the most effective and affordable method of weed control in organic peanut production. However, growers are in need of more information on specific integrated cultivation regimes for effective season-long weed control with minimal hand-weeding requirements. Therefore, field trials were conducted in 2010–2012 to evaluate the effects of various tine and sweep cultivation treatments combined with or without hand-weeding on season-long weed control, stand establishment, and yield and grade of an organically-managed peanut crop. Tine cultivation treatments consisted of no cultivation or weekly cultivations for 5 wks after planting (WAP). Sweep treatments consisted of no cultivation, weekly cultivations (for 5 WAP), cultivations at 2 and 5 WAP only, or cultivation at 5 WAP only. Hand-weeding treatments were no hand-weeding or hand-weeding of the entire plot. There were numerous significant interactions among tine and sweep treatments on weed control. Initial weed species composition greatly affected cultivation effects on overall weed control. Tine cultivation was most effective at controlling annual grass weeds. Sweep cultivation was effective at reducing weeds (Amaranthus spp., southern crabgrass, and Florida pusley), but primarily when tine cultivation was absent. Hand-weeding significantly improved weed control for every weed species every year. Additionally, inclusion of certain cultivation regimes significantly reduced the hand-weeding time requirement over the control. However, cultivation treatments did not improve pod yield or grade in any year. The most significant benefit in cultivation from these data is in the reduction in hand-weeding requirements. Based on this research, a regime consisting of weekly tine cultivations for 5 WAP, combined with two timely sweep cultivations provided the best overall balance of weed control and minimization of hand-weeding. Hand-weeding is the most critical weed control method, followed by tine cultivation, and finally sweep cultivation, which primarily served as an aid in the event of missed tine cultivations or failure.

scholarly journals Integration of chemical and manual control methods for sustainable weed management in inbred and hybrid rice

2017 ◽  
Vol 15 (2) ◽  
pp. 158-166
Author(s):  
Fahima Sultana Popy ◽  
AKM Mominul Islam ◽  
Ahmed Khairul Hasan ◽  
Md Parvez Anwar
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Weed Management ◽  
Management Practices ◽  
Hybrid Rice ◽  
Block Design ◽  
Yield Attributes ◽  
Free Treatment ◽  
Randomized Complete Block Design ◽  
Hand Weeding

Herbicidal weed control is gaining popularity in the developing countries but its efficacy still remains unclear. Therefore, an experiment was conducted to find out appropriate weed management practices for inbred and hybrid rice. The experiment comprised of inbred and hybrid varieties (two of each), and eight weed control treatments arranged in randomized complete block design with three replicates. Hybrid varieties performed better in terms of yield attributes and yield than inbred varieties. The highest grain yield (5.3 t ha−1) was obtained from the hybrid Agrodhan-12 and the lowest one (4.3 t ha−1) was from inbred Binadhan-7. Weed free treatment resulted in the highest grain yield (6.1 t ha−1) and the lowest one was with weedy treatment (1.96 t ha−1). The highest grain yield was obtained from Agrodhan-12 in weed free condition (6.9 t ha-1), while the lowest value was in inbred BRRI dhan49 under weedy condition (1.73 t ha−1). Weed-free treatment and the treatments of Pretilachlor fb Penoxsolum, Pretilachlor fb hand weeding, and Pendimethalin fb hand weeding showed similar performances in reducing weed density and eventually resulted in similar and the highest grain yield. Based on these results it may conclude that Pretilachlor applied at 2 days after transplanting (DAT) fb Penoxsolum at 21 DAT is the best weed management option. But from sustainability viewpoint, Pretilachlor or Pendimethalin applied at 2 DAT along with one hand weeding at 35 DAT may be recommended for effective weed management in inbred and hybrid rice during monsoon season.J. Bangladesh Agril. Univ. 15(2): 158-166, December 2017

Why Early Season Weed Control Is Important in Maize

Weed Science ◽  
2012 ◽  
Vol 60 (3) ◽  
pp. 423-430 ◽  
Author(s):  
Eric R. Page ◽  
Diego Cerrudo ◽  
Philip Westra ◽  
Mark Loux ◽  
Kenneth Smith ◽  
...  
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Dry Matter ◽  
Yield Loss ◽  
Treatment Plant ◽  
Field Trials ◽  
Yield Potential ◽  
Dry Matter Accumulation ◽  
State University ◽  
Weed Interference

Control of early-emerging weeds is essential to protect the yield potential of maize. An understanding of the physiological changes that occur as a result of weed interference is required to address variability in yield loss across sites and years. Field trials were conducted at the University of Guelph (UG), the Ohio State University (OSU), and Colorado State University (CSU) during 2009 and 2010. There were six treatments (season-long weedy and weed-free, and weed control at the 1st-, 3rd-, 5th-, and 10th-leaf-tip stages of maize development) and 20 individual plants per plot were harvested at maturity. We hypothesized that, as weed control was delayed, weed interference in the early stages of maize development would increase plant-to-plant variability in plant dry-matter accumulation, which would result in a reduction of grain yield at maturity. The onset of the critical period for weed control (CPWC) occurred on average between the third and fifth leaf tip stages of development (i.e., V1 to V3, respectively). Rate of yield loss following the onset of the CPWC ranged from 0.05 MG ha−1d−1at UG 2009 to 0.22 MG ha−1d−1at CSU 2010 (i.e., 0.5 and 1.6% d−1, respectively). On average, reductions in kernel number per plant accounted for approximately 65% of the decline in grain yield as weed control was delayed. Biomass partitioning to the grain was stable through early weed removal treatments, increased and peaked at the 10th-leaf-tip time of control, and decreased in the season-long weedy treatment. Plant-to-plant variability in dry matter at maturity and incidence of bareness increased as weed control was delayed. As weed control was delayed, the contribution of plant-to-plant variability at maturity to the overall yield loss was small, relative to the decline of mean plant dry matter.

scholarly journals Assessment of Integrated Weed Management in Green gram (Vigna radiata L.)

2021 ◽  
Vol 9 (4) ◽  
pp. 169-172
Author(s):  
Pritesh Doble ◽  
Keyword(s):  
Weed Control ◽  
Seed Protein ◽  
Control Method ◽  
Block Design ◽  
Green Gram ◽  
Control Treatment ◽  
Net Income ◽  
Yield Attributes ◽  
Hand Weeding ◽  
Better Than

A field experiment was carried out during rainy (Kharif) season of 2019-20 at the research farm of AKS University, Satna, Sherganj, Madhya Pradesh. The treatments comprised twelve mechanical and chemical weed control treatment as detailed in chapter III. The experiment was laid out in randomized block design with three replications. An uniform dose of 25 kg N and 50 kg P2O5 and 25 kg K2O/ha was applied through urea, SSP and MOP, to all the experimental plots. Moongbean var. Shikha was sown on 13 July, 2019 keeping a seed rate of 25 kg/ha and row spacing of 30 cm. The plant to plant spacing of 10 cm was maintained by thinning. The weedicides were applied with or without hand weeding once or twice as per treatments. The crop was harvested on 17-23 September, 2019. Amongst the mechanical and chemical weed control method (IWM), hand weeding twice (weed-free condition) proved the best which enhanced significantly higher growth, yield attributes, yield and seed protein of green gram. The seed yield was up to 0.80 t/ha, net income up to Rs.29805 /ha and seed protein 24.46 %. Thereafter each of the herbicides applied along with hand hoeing proved for better than herbicide applied alone. Quizalofop-p-ethyl 700 g/ha with hand hoeing proved better than other three herbicide with hand hoeing. Therefore looking to the labour problem for hand weeding quizalofop + hand hoeing may be adopted to gain maximum benefit from green gram.

scholarly journals Weed management in kharif rice in new alluvial zone of West Bengal

2018 ◽  
Vol 10 (2) ◽  
pp. 716-722
Author(s):  
K. Ghosh ◽  
K. A. Chowdary ◽  
B. C. Patra ◽  
S. Sardar
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Weed Management ◽  
West Bengal ◽  
Block Design ◽  
Dry Weight ◽  
Control Measures ◽  
Randomized Block Design ◽  
Chlorimuron Ethyl ◽  
Hand Weeding

A field experiment was carried out during the Kharif season of two consecutive years 2015 and 2016 at Instructional Farm, Jaguli, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal with the focal objective to assess the effect of different weed control measures on yield of transplanted kharif rice, IET 4786. Experiment having 3 replications was conducted in Randomized Block Design with nine treatments, namely, T1- Pendimethalin 30% EC + Pyrazosulfuron ethyl 10 % WP @ 675 + 15 g a.i, T2- Pendimethalin 30% EC + Pyrazosulfuron ethyl 10 % WP @ 900 + 200 g a.i, T3- Pendimethalin 30% EC + Pyrazosulfuron ethyl 10 % WP @ 1125 + 25 g a.i, T4- Pendimethalin 30% EC @ 1500 g a.i, T5- Pyrazosulfuron ethyl 10 % WP @ 15 g a.i, T6- Pyrazosulfuron ethyl 10 % WP @ 20 g a.i, T7- Metsulfuron methyl 10 % + Chlorimuron ethyl 10 % WP @ 4 g a.i, T8- Hand weeding and T9- Weedy check. Significant variations were observed on the mixed weed flora as well as on performance of rice under the different herbicidal treatments.Pendimethalin 30% EC + Pyrazosulfuron ethyl 10% WP @ 1125+25 g a.i) was found to be the most effective recording the lowest weed population and weed dry weight with  the highest weed control efficiency (83.5% in 2015 and 79.8 % in 2016) and the highest number of panicles m-2 (215.1 in 2015 and 231 in 2016), number of filled grains panicle-1 (85.39 in 2015 and 115.47 in 2016) and grain yield of rice (3.60 t/ha in 2015 and 5.30 t/ha in 2016). The lowest grain yield(2.20 t/ha in 2015 and 3.40 t/ha in 2016) and the highest weed density were observed in weedy check plots.

scholarly journals Comparison of weed control methods on infestation and crop productivity in transplant aman rice

2017 ◽  
Vol 27 (4) ◽  
pp. 418-427 ◽  
Author(s):  
MN Hasan ◽  
UK Sarker ◽  
MR Uddin ◽  
AK Hasan ◽  
MS Kaysar
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Control Method ◽  
Dry Weight ◽  
Crop Productivity ◽  
Digitaria Sanguinalis ◽  
Rice Varieties ◽  
Main Plot ◽  
Hand Weeding ◽  
Plot Design

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from June to December 2014 with a view to compare the efficacy of weeding method on the performance of transplanted aman rice varieties. Four transplanted aman rice varieties viz. Kalijira, BRRI dhan34, BRRI dhan52 and BRRI dhan64 and five different weeding treatments namely no weeding, two hand weeding at 20 & 40 days after transplanting (DAT), mechanical weeding by Japanese rice weeder at 20 and 40 DAT, soil applied pre-emergence herbicide Topstar 400 SP (Oxadiargyl 400 g/l) @ 190 ml ha-1 once at 3 days before transplanting and foliar applied post-emergence herbicide Manage @ 250g ha-1 at 6 days after transplanting were evaluated. The experiment was laid out in a split plot design assigning weed control method in the main plot and variety in the sub plot with three replications. Weed population was significantly influenced by variety and methods of weeding. The important weeds of the experimental plots were Digitaria sanguinalis, Leersia hexandra, Paspalum scrobiculatum, Echinochloa crusgalli, Monochoria vaginalis, Ludwigia hyssopifolia, Polygonum orientale, Eclipta alba, Marsilea crenata and Fimbristylis miliacea. The effect of weeding treatments on dry weight of weeds was significant. Hand weeding at 20 and 40 DAT showed the lowest dry weight of weeds followed by post-emergence herbicide Manage at 6 DAT and no weeding produced the highest dry weight of weeds. Among the weeding treatments hand weeding at 20 and 40 DAT performed the best for all the crop characters including grain yield (3.90 t ha-1) followed by the post-emergence herbicide manage and no weeding showed the lowest performance (3.06 t ha-1). Among the varieties, BRRI dhan34 produced the highest grain yield (4.33 t ha-1) and Kalijira yielded the lowest (2.04 t ha-1). The interaction between variety and weeding show that all the varieties produced higher grain yield with two hand weeding at 20 and 40 DAT than other weeding treatments. The results suggested that BRRI dhan34 might be grown with two hand weeding at 20 and 40 DAT as well as early post-emergence herbicide Manage for effective in controlling weeds and for better yield of transplant aman rice.Progressive Agriculture 27 (4): 418-427, 2016

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