scholarly journals Effect of weeding regime on the performance of boro rice cultivars

2019 ◽  
Vol 17 (3) ◽  
pp. 265-273
Author(s):  
Rakia Afroz ◽  
Md. Abdus Salam ◽  
Mahfuza Begum
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Dry Weight ◽  
Rice Cultivar ◽  
Rice Cultivars ◽  
Weed Species ◽  
Weed Density ◽  
Two Factors ◽  
Hand Weeding ◽  
Boro Rice

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from December 2016 to May 2017 to investigate the effect of weeding regime on the performance of boro rice cultivars. The experiment comprised of two factors, Factor A-  Rice cultivars: BRRI dhan28, BRRI dhan29, and BRRI dhan74, Factor B: Methods of weeding- no weeding, two hand weedings at 15 and 35 DATs, application of pre-emergence herbicide Commit, application of early post-emergence herbicide Pediplus, application of pre-emergence herbicide Commit followed by application of early post-emergence herbicide Pediplus, application of pre-emergence herbicide Commit followed by one hand weeding at 35 DAT, and application of early post-emergence herbicide Pediplus followed by one hand weeding at 35 DAT. The experiment was laid out in a split plot design assigning rice cultivars in the main plots and weed management practices in the sub-plots with three replications. Fourteen weed species infested the experimental field belonging to six families. Among the weed species, four were grasses, four were broad leaves and six were sedges. Cultivar exerted significant effect on weed density and dry weight. Both the highest weed density and dry weight were found in BRRI dhan28 and the lowest ones were observed in BRRI dhan29 rice cultivar. Weed density and weed dry weight were significantly influenced by weeding regime. The highest weed density and dry weight were observed in no weeding condition and application of pre-emergence herbicide Commit followed by one hand weeding at 35 DAT showed the best performance. BRRI dhan29 produced the highest grain and straw yields among the cultivars. Weed control had pronounced influence on yield of rice. The highest grain yield was obtained in application of pre-emergence herbicide Pretilachlor (Commit)followed by one hand weeding at 35 DAT and the lowest one was obtained in control (no weeding) treatment. From the results of the study it may be concluded that rice cultivar BRRI dhan29 with application of pre-emergence herbicide Commit followed by one hand weeding at 35 DAT might be the best treatment for controlling weed effectively as well as obtaining highest yield and highest economic return. J Bangladesh Agril Univ 17(3): 265–273, 2019

Effect of weed management practices and organic sources of nitrogen supplementation on weed density and yield of wheat

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
Bhupesh Kumar Mishra ◽  
Santosh Pandey
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Management Practices ◽  
Maximum Yield ◽  
Poultry Manure ◽  
Dry Weight ◽  
Control Methods ◽  
Weed Species ◽  
Weed Density ◽  
Hand Weeding

The different weed control methods (two hand weeding at 25 and 45 days after sowing (DAS) and one hand weeding at 25 DAS along with unweeded control ), organic sources of nitrogen (vermicompost, poultry manure, city manure and FYM) and their interaction were compared for their efficiency on various weed species and yield of wheat. Two hand weeding (W2) gave significantly maximum weed control. This was followed by one hand weeding at 25 DAS and control. These weed control methods significantly enhanced the yield and yield components of wheat. Among organic sources of nitrogen vermicompost (M1) recorded minimum weed density, weed dry weight and maximum yield, followed by poultry manure, city manure and FYM.

scholarly journals Studies on weed cover and diversity in coriander (Coriandrum sativum L.) as influenced by weed management and balanced fertilization techniques

2017 ◽  
Vol 5 (3) ◽  
pp. 387-395
Author(s):  
Raj Kumar Nagar ◽  
Dinesh Kumar Jain
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Cyperus Rotundus ◽  
Weed Species ◽  
Significant Interaction Effect ◽  
Weed Density ◽  
Chenopodium Murale ◽  
Balanced Fertilization ◽  
Biological Yield ◽  
Hand Weeding

A field experiment was conducted to analyze the types of flora, intensity, cover and effects on yields of coriander. Pooled analysis of data indicated that Goose foot (Chenopodium murale L.), Corn spurry (Spergula arvensis L.) among dicots and Purple nutsedge (Cyperus rotundus L.) among monocots were found most dominant weeds at all stages of crop growth. Of the total eight weed species reported dicot weeds were found most dominating weed species and comprises 78-80 percent of total weed density throughout crop cycle. All weed management practices significantly reduced the density of monocot and dicot weeds and improved the yield (seed and biological yield) of crop as compared to control. Two hand weeding at 30 and 45 DAS resulted in maximum reduction in total weed density and gave the highest seed (15.84 q/ha) and biological yield (41.11 q/ha) of coriander. However, seed and biological yields was obtained at par by pendimethalin 1.0 kg/ha + one hand weeding at 45 DAS. This treatment also resulted in favorably lowest weed competition index as compared to rest of other practices. Balanced fertilization with N+P+K+S also improved monocot and dicot weed density but the effect was not significant over N+P and N+P+K fertilization. N+P+K+S fertilization significantly enhanced crop seed and biological yields over N+P (1.86 q/ha and 4.36 q/ha, respectively) and N+P+K application (0.94 q/ha and 2.20 q/ha, respectively). Weed management and balanced fertilization practices also found to have significant interaction effect on seed and biological yield of coriander.

scholarly journals Weed Dynamics and Productivity of Direct Wet Seeded Rice under Different Weed Management Practices

2020 ◽  
Author(s):  
M. Vasantha Kokilam ◽  
S. Rathika ◽  
T. Ramesh ◽  
M. Baskar
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Wide Spectrum ◽  
Dry Weight ◽  
Yield Attributes ◽  
Weed Density ◽  
Transplanted Rice ◽  
Direct Seeded ◽  
Weed Dynamics ◽  
Hand Weeding

Background: Weeds are the major biotic constraint to reduce the rice productivity in direct wet seeded rice. Weed infestation and competition are severe in direct wet seeded rice as compared to transplanted rice, because of the simultaneous growth of both crops and weeds. The yield loss due to weeds varies from 40 to 100 per cent in direct seeded rice. Use of herbicides either singly or in combination with manual or mechanical weeding in puddled direct seeded rice has been highlighted by several workers. Use of alternative herbicides with wide spectrum control of the weeds in direct seeded puddled rice is the need of the present time. The present study aimed to evaluate different weed management practices in direct wet seeded rice under sodic soil.Methods: A field experiment was conducted during Samba season (Rabi) 2016-17. to evaluate the weed management practices in direct wet seeded rice under sodic soil. The treatments comprised of different combination of weed management practices viz., pre emergence, early post emergence herbicides, mechanical weeding and hand weeding twice were tested. Total weed density and weed dry weight, weed control efficiency, yield parameters and yield of rice were recorded. Result: Among the different weed management practices, the lowest total weed density, total weed dry weight and higher WCE, yield attributes, grain and straw yields were registered under application of PE pyrazosulfuron ethyl 25 g/ha fb EPOE bispyribac sodium 25 g/ha. This was followed by application of PE pretilachlor 0.75 kg/ha fb EPOE bispyribac sodium 25 g/ha. 

scholarly journals Effect of rice residue on weed suppression and yield performance of boro rice

2020 ◽  
Vol 5 (3) ◽  
pp. 320-327
Author(s):  
Md. Abdus Salam ◽  
Jannatul Ferdus ◽  
Afroza Sultana ◽  
Abu Salek
Keyword(s):  
Grain Yield ◽  
Weed Management ◽  
Block Design ◽  
Dry Weight ◽  
Weed Suppression ◽  
Weed Species ◽  
Weed Density ◽  
Herbicide Treatment ◽  
Effect On Yield ◽  
Boro Rice

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from December 2017 through May 2018 to study the effect of rice residue on weed suppression and yield of boro rice. The experiment consisted of four different rice residue treatments such as no rice residue, 2.5, 5 and 7.5t ha-1rice residue, and five different herbicidal treatments such as no herbicide (H0), 25% of the recommended dose (RD), 50% RD, 75% RD and 100% of RD. The experiment was laid out in a randomized complete block design with three replications. Seven weed species belonging to five families infested the experimental plots. Weed density and weed dry weight were significantly affected by incorporation of rice residue and herbicidal treatment. The maximum weed growth was noticed with no rice residue incorporation and application of no herbicide. The minimum weed density and dry weight were found in incorporation of 5 t rice residue ha-1 and application of 100% of RD of herbicide treatment. Rice residue exerted significant effect on yield and yield contributing characters like plant height, number of total tillers hill-1, number of effective tillers hill-1 and grain yield. The highest grain yield (4.89 t ha-1) was recorded with the incorporation of 2.5 t ha-1 rice residue which was statistically identical with5 and 7.5 t ha-1 rice residues. The grain yield (5.70 t ha-1) produced by 75% of RD of herbicide was the highest among the other herbicidal treatments. The highest number of effective tillers hill-1 (12.80), 1000-grain weight (21.07), grain yield (5.87 t ha-1) and straw yield (7.21 t ha-1) were observed with the incorporation of 5 t rice residue ha-1 and 75% of the RD of herbicide treatment. Results of this study indicate that rice residue showed potentiality to inhibit the growth of weed and exerted significant effect on the yield of boro rice. Rice residue @ 5 t ha-1 with application of herbicide of 75% RD might be suggested to use for effective weed management and better grain yield of boro rice.

scholarly journals Impact of Integrated Weed Management Practices on Yield and Economics of Semidry Rice

2020 ◽  
pp. 25-32
Author(s):  
V. Soujanya ◽  
M. Goverdhan ◽  
T. Ram Prakash ◽  
A. Srinivas
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Agricultural Research ◽  
Dry Weight ◽  
Integrated Weed Management ◽  
Research Station ◽  
Weed Density ◽  
Weight Yield ◽  
Chlorimuron Ethyl ◽  
Hand Weeding

A field experiment was conducted during Kharif, 2019 at Agricultural Research Station, Rajendranagar, Hyderabad to study the effect of integrated weed management practices on weed density, weed dry weight, yield and economics of semidry rice. Among all the treatments pyrazosulfuron ethyl @ 20 g a.i ha-1 fb chlorimuron ethyl + metsulfuron methyl @ 4 g a.i ha-1 + fenoxaprop-p-ethyl @ 60 g a.i ha-1 fb mechanical weeding at 50 DAS recorded significantly lower weed density, weed dry weight with highest weed control efficiency. Grain yield and B:C ratio were also recorded highest from the same treatment in semidry rice system of cultivation. This treatment was statistically comparable with hand weeding plot.

scholarly journals Evaluation of Different Weed Management Practices on Growth Variables and Yield of Wheat Varieties

2020 ◽  
pp. 7-30
Author(s):  
Md. Golam Mostafa ◽  
Syed Arvin Hassan ◽  
Md. Ehsanul Haq ◽  
Md. Ahasan Habib ◽  
Kaniz Fatema ◽  
...  
Keyword(s):  
Grain Yield ◽  
Weed Management ◽  
Management Practices ◽  
Cynodon Dactylon ◽  
Chenopodium Album ◽  
Cyperus Rotundus ◽  
Alternanthera Philoxeroides ◽  
Weed Species ◽  
Wheat Varieties ◽  
Hand Weeding

A field experiment was conducted in medium fertile soil at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during November 2017 to April 2018 in Rabi season with a view to evaluate the performance of wheat varieties under different weed control methods. The experiment was carried out with three varieties i.e. BARI Gom-28, BARI Gom-29 and BARI Gom-30 in the main plot and five weed management methods viz. control (no weeding), two hand weeding at 20 and 40 DAS, Panida 33EC (Pendimethalin) @ 2000 ml ha-1 at 5 DAS pre-emergence, Afinity 50.75WP (Isoproturon) 1500 g ha-1 at 25 DAS as post-emergence herbicide and Panida 33EC (Pendimethalin) @ 2000 ml ha-1 at 5 DAS + Afinity 50.75WP (Isoproturon)1500 g ha-1 at 25 DAS in the sub plot in split plot design. Nine different major weed species were found in the field such as Cynodon dactylon, Cyperus rotundus, Echinochloa colonum, Eleusine indica, Chenopodium album, Alternanthera philoxeroides, Brassica kaber, Leliotropium indicum, Vicia sativa. Results reveled that BARI Gom-30 contributed the highest grain yield 3.01 tha-1. Pre-emergence application of Panida 33EC controlled weeds significantly which showed highest growth followed by yield achieved in wheat. BARI Gom-30 in combination with Panida 33EC produced the highest grain yield 3.52 tha-1 while the lowest grain yield 2.09 t ha-1 was obtained from BARI Gom-28 with no weeding treatment. Results reveled that Panida 33EC (pre-emergence) was found more effective to controlling weeds in wheat. Results of the study finally reveled that Panida 33EC might be considered as a feasible option for combating weed and ensuring higher yield in wheat cultivation.

scholarly journals Relation between Soil Weed Seedbank and Weed Management Practises and Diversity in Farms in Kisii Central Sub County, Nyanza

2020 ◽  
Vol 10 ◽  
pp. 1-14
Author(s):  
Charles N. Nyamwamu ◽  
Rebecca Karanja ◽  
Peter Mwangi
Keyword(s):  
Seed Bank ◽  
Weed Management ◽  
Management Practices ◽  
Soil Seed Bank ◽  
Shannon Index ◽  
Weed Seed ◽  
Weed Species ◽  
Western Kenya ◽  
Weed Diversity ◽  
Hand Weeding

This study sought to determine the relation between soil weed seed bank and weed management practices and diversity in farms in Kisii Central Sub County, Western Kenya. Eight administrative sub-locations were randomly selected. Ten farms were selected at equal distance along transect laid across each sub-location. Weed soil seed bank was assessed from soil samples collected from each of the farms; a sub-sample was taken from a composite sample of ten soil cores of 5cm diameter and 15cm deep and placed in germination trays in a greenhouse. Weed diversity in soil weed seedbank was calculated using the Shannon index (H’). Twelve weed species from 12 genera of nine families were recorded. Diversity of the weed species in soil weed seed bank was (H'=1.48). Weed management practises significantly affected weed species soil weed seedbank reserves. Use of inefficient and ineffective hand-weeding techniques resulted in high weed species diversity and abundance.

Response of fieldpea (Pisum sativum L. var arvense) to various planting methods, irrigation schedule and weed management practices

2015 ◽  
Author(s):  
Brijbhooshan ◽  
V. K. Singh ◽  
Shalini
Keyword(s):  
Grain Yield ◽  
Nutrient Uptake ◽  
Weed Management ◽  
Dry Matter ◽  
Management Practices ◽  
Dry Weight ◽  
Yield Attributes ◽  
Planting Methods ◽  
Raised Bed ◽  
Hand Weeding

A field experiment was conducted during rabi seasons of 2007-08 and 2008-09 on mollisols at G.B. Pant University of Agriculture & Technology, Pantnagar to study the performance of fieldpea (Pisum sativum L.var arvense) under different planting methods, irrigation levels and weed management practices. Results revealed that growth attributes as plant height, number of branches and dry matter accumulation per plant, number and dry weight of nodules per plant, density and dry matter of weeds/unit area, nutrient uptake and yield attributes as pods/plant, 1000-grain weight, grain yield/plant and grain yield of fieldpea were significantly higher under raised bed planting as compared to flat bed. Planting on raised bed increased grain yield of fieldpea by 17.5% over flat bed. Two irrigations applied at critical stages i.e. pre-flowering and pod formation proved promising in increasing the growth, nutrient uptake, yield attributes and grain yield of pea. One hand weeding done at 25 days after sowing (DAS) reduced the density and dry matter of weeds significantly and one hand weeding done at 25 DAS increased the values of growth attributes, number and dry weight of nodules, nutrient uptake, yield attributes and grain yield as compared to pendimethalin 1.0 kg a.i./ha applied as pre-emergence and weedy check.

scholarly journals Weed Management Strategies in Chickpea (Cicer arietinum): A Review

2020 ◽  
Author(s):  
Akashdeep Singh ◽  
S. S. Rana ◽  
Anju Bala
Keyword(s):  
Weed Control ◽  
Cicer Arietinum ◽  
Weed Management ◽  
Management Practices ◽  
Management Strategies ◽  
Detailed Knowledge ◽  
Basic Requirement ◽  
Weed Species ◽  
The World ◽  
Hand Weeding

Chickpea (Cicer arietinum) is one of the most important pulse crops but it’s productivity in India is quite low. There are various reasons for low productivity. Weed control is the basic requirement and the major component of crop management. Weeds on an average reduce the crop yield by 40-87 per cent. Deciding time to control weeds requires detailed knowledge of the weed populations in the field. Different management practices like altering spacing, competitive cultivars, etc. can help in enhancing the productivity. With the world entering the precision-farming era, more emphasis is being put on the use of post-emergence herbicides. Application of two or more herbicide at the same time or as a double knockdown and integrating with hand-weeding provides desirable control of different weed species besides reducing the hazard of chemical weed control.

scholarly journals Standardization of spacing and weed management practices in SRI system of rice cultivation under organic conditions in relation to sustainable agriculture in the changing scenario of climate

2014 ◽  
Vol 15 (3) ◽  
pp. 51-54
Author(s):  
Rameshwar K. ◽  
J.P. Saini ◽  
Sanjay Chadha ◽  
Punam K. ◽  
R.G. Upadhyay
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Block Design ◽  
Rice Variety ◽  
Dry Weight ◽  
Yield Attributes ◽  
Organic Farm ◽  
Commelina Benghalensis ◽  
Hand Weeding ◽  
Paddy Yield

A field experiment was conducted during kharif seasons of 2009 & 2010 at Model Organic Farm of Department of Organic agriculture, CSK Himachal Pradesh Krishi Vishvavidyalya Palampur in factorial randomized block design with three replications consisting of eight treatment combinations. The treatments included two methods of weeding (mechanical weeding with cono weeder & hand weeding) and 4 spacings (25x25, 30x30, 20x20 and 30x20 cm). Rice variety RP-2421 was transplanted in second week of July during both the years following all organic packages of practices. The weeding was done at 20 & 40 days after transplanting rice. The dominant species of weeds were Echinochloa crusgalli, Digitaria sanguinalis and Panicum  dichotomiflorum among grasses; Cyperus iria and Cyperus difforimis among sedges and Aeschynomera indica, Ammania spp and Commelina benghalensis among broadleaved weeds.The experimental results revealed that 2 mechanical weedings with cono-weeder at 20 & 40 DAT resulted in significantly higher values of yield attributes viz. effective tillers/m2 & panicle length and hence higher paddy yield and lower weed dry weight over hand weeding twice (20 & 40 DAT). However, grains/ panicle and 1000 grain weight did not vary significantly during both the years. Among spacings 30x30 cm being at par with 25x25 cm & 30x20 cm recorded significantly higher paddy yield and lower weed dry weight over 20x20 cm during both the years. The interactions between method of weedings& spacing were observed to be non-significant during both the years of study.

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