EFFECTS OF FLOODING AND APPLICATION TIME OF THIOBENCARB HERBICIDE EFFICACY IN PADDY RICE

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FARZAN S.; YAGHOUBI B.; ASGHARI J.; RABIEE B.; MOHAMMADVAND E.

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Journal: Crop Production Year:2016 | Volume:8 | Issue:4 Page(s): 1-23

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Title

EFFECTS OF FLOODING AND APPLICATION TIME OF THIOBENCARB HERBICIDE EFFICACY IN PADDY RICE

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Keywords

DOSEQ2

HERBICIDEQ2

RICEQ2

THIOBENCARBQ2

WATER SHORTAGEQ2

Abstract

Background and objectives: Growth irregularity and yield reduction has been reported in some transplanted RICE growing area treated with THIOBENCARB (TB) HERBICIDE. This experiment was carried out in order to study the effect HERBICIDE application time and flooding time on response of RICE and weeds to TB DOSEs. Materials and methods: The experiment was laid out as a factorial split-plot in a randomized complete block design with three replications. Treatments included factorial arrangement of time of TB application (before and after transplanting) and time of flooding (before and after TB application) as main plot and TB DOSEs (0, 1, 1.5, 3, 4.5 and 6 Kg.ai.ha-1) as subplot.Results: TB efficacy in barnyardgrass and sedges control 4 weeks after transplanting (WAT) was similar and in 6- WAT, TB efficacy on barnyardgrass control was better. Irrespective of time of TB application, the dosage required for 50 or 90% barnyardgrass or sedges biomass reduction was less if TB was applied before flooding compared with after flooding application, but TB selectivity on RICE decreased in non-flooded treatments. In waterlogged soil that the experiment was carried out, TB caused 12% and 4% mortality of transplanted RICE seedlings when TB was applied before and after flooding and also 9% and 5% if applied before and after transplanting respectively, which occurred in the highest investigated DOSE. Increasing TB DOSE up to 50 percent more than the recommended DOSE (3 Kg.ai.ha-1), increased RICE leaf area and further increasing the DOSE of HERBICIDE despite better control of weeds, RICE leaf area was reduced indicating the phytotoxicity of TB on RICE. In general, RICE produced 25 and 15% more LAI and tiller, by applying TB at flooded plots compared with non-flooded plots, respectively. RICE plant height response to TB DOSE and time of application was similar to leaf area and decreased more if HERBICIDE was applied before flooding. Also fertile (paniclebearing) and unfertile (nonpanicle-bearing) tillers were affected by time of flooding and TB DOSE, if applied after and before flooding the most fertile and unfertile panicles were produced, respectively. Grain yield, biological yield and harvest index trends were presented by three parameters Gaussian model (R2≥84%). Based on these models, by increasing the TB rate these traits increased and then decreased, but reduction in lower DOSEs of TB occurred if TB was applied before flooding.Conclusion: TB cannot be recommended in paddy waterlogging soils if they are facing flooding limitation in early season when TB is applied. Despite better weed control in non-flooded treatments is obtained, TB causes delayed growth irregularity and yield reduction if fields are treated in non-flooded condition. Continuous application of TB in successive years exacerbated TB phytotoxicity.

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APA: Copy

FARZAN, S., YAGHOUBI, B., ASGHARI, J., RABIEE, B., & MOHAMMADVAND, E.. (2016). EFFECTS OF FLOODING AND APPLICATION TIME OF THIOBENCARB HERBICIDE EFFICACY IN PADDY RICE. ELECTRONIC JOURNAL OF CROP PRODUCTION, 8(4), 1-23. SID. https://sid.ir/paper/135205/en

Vancouver: Copy

FARZAN S., YAGHOUBI B., ASGHARI J., RABIEE B., MOHAMMADVAND E.. EFFECTS OF FLOODING AND APPLICATION TIME OF THIOBENCARB HERBICIDE EFFICACY IN PADDY RICE. ELECTRONIC JOURNAL OF CROP PRODUCTION[Internet]. 2016;8(4):1-23. Available from: https://sid.ir/paper/135205/en

IEEE: Copy

S. FARZAN, B. YAGHOUBI, J. ASGHARI, B. RABIEE, and E. MOHAMMADVAND, “EFFECTS OF FLOODING AND APPLICATION TIME OF THIOBENCARB HERBICIDE EFFICACY IN PADDY RICE,” ELECTRONIC JOURNAL OF CROP PRODUCTION, vol. 8, no. 4, pp. 1–23, 2016, [Online]. Available: https://sid.ir/paper/135205/en

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