Response of weed flora to different herbicides in aerobic rice system

2012 ◽  
Vol 7 (1) ◽  
Author(s):  
Moshiur Rahman
Keyword(s):  
Aerobic Rice ◽  
Weed Flora ◽  
Aerobic Rice System

Aerobic rice system improves water productivity, nitrogen recovery and crop performance in Brazilian weathered lowland soil

2018 ◽  
Vol 218 ◽  
pp. 59-68 ◽  
Author(s):  
Andre Froes de Borja Reis ◽  
Rodrigo Estevam Munhoz de Almeida ◽  
Bruno Cocco Lago ◽  
Paulo Cesar Trivelin ◽  
Bruce Linquist ◽  
...  
Keyword(s):  
Water Productivity ◽  
Nitrogen Recovery ◽  
Aerobic Rice ◽  
Crop Performance ◽  
Aerobic Rice System

scholarly journals Grain yield of aerobic rice as influenced by seed rate and row spacing in aerobic situation under changed climate

2016 ◽  
Vol 8 (4) ◽  
pp. 2164-2169
Author(s):  
K. Jana ◽  
S. K. Das ◽  
G. Moinuddin ◽  
G. K. Mallick ◽  
B. Biswas
Keyword(s):  
Grain Yield ◽  
Aerobic Condition ◽  
Rice Crop ◽  
Change Scenario ◽  
Row Spacing ◽  
Research Station ◽  
Aerobic Rice ◽  
Seed Rate ◽  
Kharif Season ◽  
Aerobic Rice System

Aerobic rice system is the method of cultivation, where the rice crop is established by direct seeding in un-puddle field. The grain yield of aerobic rice in aerobic situation realized by the farmers is still lower. Among many factors, seed rate and row spacing influence the grain yield of aerobic rice crop. The present investigation was carriedout to study the influence of seed rates and row spacing on grain yield of aerobic rice in aerobic situation, and field experiment was conducted at Rice Research Station, Bankura, West Bengal, India during kharif season of 2011 and 2012. The experimental results exhibited that the highest grain yield (3.40, 3.49 and 3.42 t ha-1 during kharif 2011, kharif 2012 and in pooled value, respectively) was recorded from treatment S2, where seed rate was 30 kg ha-1. Among the different row spacing, the maximum grain yield of 3.47, 3.45 and 3.46 t ha-1 during kharif season of 2011 and 2012 and on pooled basis was obtained with the treatment R1 i.e. 20 cm row spacing. The treatment combination of S2 (seed rate @ 30 kg ha-1) and R1 (20 cm row spacing) recorded the highest grain yield (4.01 t ha-1) of aerobic rice. It was established that the seed rate @ 30 kg ha-1 and 20 cm row spacing was promising for realizing best grain yield of aerobic rice in aerobic condition. It is an important eco-safety tool for tackling the climate change scenario.

scholarly journals Effect of Weed Management Practices on Complex Weed Flora and Soil Microflora in Aerobic Rice under Rainfed Condition of Bihar

2020 ◽  
pp. 72-79
Author(s):  
Birendra Kumar ◽  
Sunil Kumar ◽  
Rakesh Deo Ranjan ◽  
C. S. Azad
Keyword(s):  
Grain Yield ◽  
Weed Management ◽  
Management Practices ◽  
Oryza Sativa L ◽  
Early Stage ◽  
Cyperus Rotundus ◽  
Aerobic Rice ◽  
Yield Attributes ◽  
Weed Flora ◽  
Hand Weeding

A Field experiment was conducted during the Kharif season of 2018 at Bihar Agricultural University, Sabour (Bihar) to evaluate the performance of different herbicides in aerobic rice (Oryza sativa L). Weed management had a positive influence on growth, yield attributes and yield of the aerobic rice. In experimental field, Cyperus rotundus, Cyperus iria, Cyperus difformis, Cynodon dactylon, Eleusine indica, Fimbristylis miliacea, Echinochloa colona, Echinochloa crus-galli, Commelina benghalensis, Caesulia auxillaris, Lippia nodiflora, Amaranthus spinosus, Oxalis acetosella, Amaranthus viridis, Eclipta alba, Phyllanthus niruri and Monochoria vaginalis were the dominant weed flora species. The results revealed that lowest weed population and weed dry weight were recorded in weed free situation which were significantly superior over rest of the herbicidal treatments. The maximum mean grain yield of aerobic rice (4.00 t/ha) was recorded by weed free which intern was statistically at par with the mean grain yield obtained from the herbicide Pyrazosulfuron fb one hand weeding (3.92 t/ha) followed by Pyrazosulfuron fb Bispyribac (3.88 t/ha), Bispyribac sodium (3.83 t/ha), Pyrazosulfuron+Ethoxysulfuron (3.62 t/ha), Bispyribac sodium+Pyrazosulfuron (3.61 t/ha) and Halosulfuron + Azimsulfuron (3.50 t/ha). Significantly lowest mean grain yield of (1.90 t/ha) was obtained from weedy check plots. The highest weed control efficiency (100%) was recorded under the treatment weed free which was followed by Pyrazosulfuron fb one hand weeding (85.96%), Pyrazosulfuron fb Bispyribac (84.77%), Bispyribac sodium (83.09%). All microflora (bacteria, fungi, actinomycetes) were recorded maximum number under the treatment weedy check. There were halosulfuron causes some phytotoxic effects at early stage on rice crop. The highest gross return (Rs.70,000/ha) was obtained by weed free which was statistically at par with Pyrazosulfuron fb one hand weeding (Rs.68,600/ha), Pyrazosulfuron fb Bispyribac(Rs.67,900/ha), Bispyribac sodium (Rs.67,025/ha), Pyrazosulfuron+Ethoxysulfuron (Rs.63,350), Bispyribac sodium+Pyrazosulfuron (Rs.58,800/ha) and significantly superior over rest of the treatments. However, the highest net return (Rs. 37,323/ha) was recorded by the treatment Pyrazosulfuron fb Bispyribac sodium which was found superior over rest of the treatments. The highest B:C ratio (Rs.2.22) was recorded by Pyrazosulfuron fb Bispyribac which was statistically at par with Bispyribac sodium (Rs.2.20), Pyrazosulfuron fb one hand weeding (Rs.2.19), Pyrazosulfuron+Ethoxysulfuron (Rs.2.13) and Bispyribac sodium+Pyrazosulfuron (Rs.1.91) all these were significantly superior over rest of the treatments.

Potential of crude extract and isolated compounds from golden beard grass (Chrysopogon serrulatus) for control of sprangletop (Leptochloa chinensis) in aerobic rice systems

2014 ◽  
Vol 65 (5) ◽  
pp. 461 ◽  
Author(s):  
T. S. Chuah ◽  
H. Y. Oh ◽  
M. Habsah ◽  
M. Z. Norhafizah ◽  
B. S. Ismail
Keyword(s):  
Dibutyl Phthalate ◽  
Aerobic Rice ◽  
Rice Seed ◽  
Rice Seedlings ◽  
Inhibitory Effects ◽  
Shoot Height ◽  
Rice Plants ◽  
Natural Herbicide ◽  
Root And Shoot Growth ◽  
Aerobic Rice System

Extraction and fractionation of the culm plus leaves of Chrysopogon serrulatus Trin. produce three major compounds, dibutyl phthalate (DBP), diphenylamine, 4,4′-dioctyl and simiarenol, which potentially act as allelochemicals or phytotoxic compounds. The effects of these compounds were examined using Leptochloa chinensis (L.) Nees as the bioassay species. The isolated compounds showed different degrees of inhibitory effects against L. chinensis. Of the three, DBP was the most potent and was able to inhibit L. chinensis germination by >70% at 500 mg L–1, followed by simiarenol and diphenylamine, 4,4′-dioctyl with inhibition values ranging from 40 to 52%. Under aerobic conditions, DBP at 2.4 kg a.i. ha–1 reduced the emergence and shoot fresh weight of L. chinensis by >50%, with negligible effect on root and shoot growth of aerobic rice seedlings, suggesting this as the most suitable rate and compound to control L. chinensis without injuring rice seedlings. At an application on the day of sowing rice seed, across DBP rates, reduction in root and shoot height of rice plants was evident when assessed 14 days after DBP treatment. However, rice plants become less susceptible with increasing growth stage. The findings suggest that DBP has potential to be developed as a pre-emergence, soil-applied natural herbicide for control of L. chinensis in aerobic rice system.

scholarly journals Weed Control by Single Post-emergence Combination Herbicide Florpyrauxifen-Benzyl Plus Cyhalofop Butyl in Aerobic Rice

2020 ◽  
pp. 109-122
Author(s):  
B. Sreedevi ◽  
Aarti Singh ◽  
Chandulal Thakur ◽  
M. Prasant Kumar ◽  
Vinod Mehra ◽  
...  
Keyword(s):  
Weed Control ◽  
Rice Yield ◽  
Negative Relationship ◽  
Residual Effect ◽  
New Combination ◽  
Effective Dosage ◽  
Aerobic Rice ◽  
Combination Product ◽  
Wide Range ◽  
Weed Flora

Florpyrauxifen benzyl + cyhalofop butyl is a new combination herbicide product which has proven to control wide range of weed flora. A two year study was planned in the wet and dry seasons of 2015-16 and 2016-17 to evaluate effective dosage of early post-emergence combination herbicide product florpyrauxifen benzyl + cyhalofop butyl (120; 150 and 180 g ha-1) to manage weeds in aerobic rice and study the residual effect on succeeding maize crop. The results revealed that Barnyard grass (Echinochloa crusgalli) followed by Dinebra retroflexa (viper grass) dominated among the weed flora. The combination product florpyrauxifen benzyl + cyhalofop Butyl 180 g ha-1 contributed to significantly lower density and dry biomass accumulation by grass and broadleaf weeds as compared to weedy check; however its efficacy was poor on sedges at 60 days after sowing (DAS). Highest weed control efficiency was recorded by florpyrauxifen benzyl + cyhalofop butyl 180 g ha-1. The highest yield (4100 and 3420 kg ha-1) was in plots treated with florpyrauxifen benzyl + cyhalofop butyl at 180 g ha-1 and the lowest yield was in florpyrauxifen benzyl 31.25 g ha-1 (3280 and 2870 kg ha-1) followed by bispyribac sodium 25 g ha-1 (3320 and 2940 kg ha-1) in 2015 and 2016, respectively. Weed infestation decreased the rice yield by nearly about 69% in 2015 and 72% in 2016. A strong negative relationship between rice yield and weed biomass was seen which explained 87 and 91% variation in grain yield at 30 and 60 DAS. Combination product florpyrauxifen benzyl + cyhalofop butyl at all rates did not have any residual toxic effect on succeeding maize. Based on the findings, it can be concluded that aerobic rice weeds can be controlled by applying early post-emergence application of combination product florpyrauxifen benzyl + cyhalofop butyl 150 to 180 g ha-1 without any residual toxicity.

scholarly journals Efficacy and economics of different herbicides in aerobic rice system

2011 ◽  
Vol 10 (41) ◽  
pp. 8007-8022 ◽  
Author(s):  
S M Jaya Suria A ◽  
Shukor Juraimi Abdul ◽  
Moshiur Rahman Md ◽  
B Man Azmi ◽  
Selamat Ahmad
Keyword(s):  
Aerobic Rice ◽  
Aerobic Rice System

Correlation Analysis for Yield and Yield Contributing Characters Involving in Aerobic Rice

2012 ◽  
Vol 2 (10) ◽  
pp. 1-2
Author(s):  
D. Malath D. Malath ◽  
◽  
P. Gomathinayagam P. Gomathinayagam
Keyword(s):  
Correlation Analysis ◽  
Aerobic Rice

Influence of NPK fertilization on weed flora in maize field

2014 ◽  
Vol 63 (1) ◽  
pp. 139-148 ◽  
Author(s):  
Éva Lehoczky ◽  
M. Kamuti ◽  
N. Mazsu ◽  
J. Tamás ◽  
D. Sáringer-Kenyeres ◽  
...  
Keyword(s):  
Plant Nutrition ◽  
Crop Production ◽  
N Availability ◽  
Weed Species ◽  
Negative Effects ◽  
Production Factors ◽  
Maize Field ◽  
Weed Flora ◽  
Npk Fertilization

Plant nutrition is one of the most important intensification factors of crop production. The utilization of nutrients, however, may be modified by a number of production factors, including weed presence. Thus, the knowledge of occurring weed species, their abundance, nutrient and water uptake is extremely important to establish an appropriate basis for the evaluation of their risks or negative effects on crops. That is why investigations were carried out in a long-term fertilization experiment on the influence of different nutrient supplies (Ø, PK, NK, NPK) on weed flora in maize field.The weed surveys recorded similar diversity on the experimental area: the species of A. artemisiifolia, S. halepense and D. stramonium were dominant, but C. album and C. hybridum were also common. These species and H. annuus were the most abundant weeds.Based on the totalized and average data of all treatments, density followed the same tendency in the experimental years. It was the highest in the PK treated and untreated plots, and significantly exceeded the values of NK fertilized areas. Presumably the better N availability promoted the development of nitrophilic weeds, while the mortality of other small species increased.Winter wheat and maize forecrops had no visible influence on the diversity and the intensity of weediness. On the contrary, there were consistent differences in the density of certain weed species in accordance to the applied nutrients. A. artemisiifolia was present in the largest number in the untreated control and PK fertilized plots. The density of S. halepense and H. annuus was also significantly higher in the control areas. The number of their individuals was smaller in those plots where N containing fertilizers were used. Contrary to them, the density of D. stramonium, C. album and C. hybridum was the highest in the NPK treatments.

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