COMPARISON OF SOME HERBICIDES ON CAUSING THE DWARFNESS ON RICE

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YAGHOUBI BIJAN; ALIZADEH HASSAN; RAHIMIAN HAMID; BAGHESTANI MOHAMMAD ALI; DAVATGAR NASER

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Journal: IRANIAN JOURNAL OF WEED SCIENCE Year:2010 | Volume:6 | Issue:2 Page(s): 23-40

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Title

COMPARISON OF SOME HERBICIDES ON CAUSING THE DWARFNESS ON RICE

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RESISTANCEQ2

ACETYL COA CARBOXYLASEQ2

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Abstract

In order to investigate the effect of most common paddy selective herbicides on causing growth disorder called dwarfism two experiments were laid out in 2007 in Rice Research Institute of Iran, Rasht. The dose response study was carried out by herbicides thiobencarb "TB", butachlor and oxadiargil and Hashemi rice cultivar in Petri dishes containing agar and Youshida growth medium. Visual evaluation of herbicides toxicity on seedlings showed that TB caused specific growth irregularity including dark greenish leaves, dwarf stature of seedlings, short thick leaves and brown color roots that are known as symptoms of dwarfism. Regression analysis of rice seedlings height, root length and fresh weight by fitting sigmoidal logistic dose response equations showed that the inhibitory effect of thiobencarb on rice growth was significantly more than two other herbicides (P<0.001) as shown by model parameters. The dosage needed for 50% reduction in height (GR50) of rice seedlings was 40 times lesser for TB compared with two other herbicides. The second experiment was arranged in order to evaluate the accuracy the results of first study, as dwarfism symptoms were only observed in Petri dishes treated with TB. The study was carried out in pots containing paddy soils with the precedence of severe dwarfism. Treatments included time of TB application (before and after transplanting), pots water level (saturated and flooded) and dosages (in 6 levels 0, 2, 4, 6, 8 & 10 kg.ai.ha-1) in a split split plot design with factorial arrangement of treatments in 3 replications. Also two other herbicides were included as control. Toxicity of herbicides were evaluated visually based on 0-100 where 0 indicates no effect, and 100 was complete plant death.Results of this experiment also confirmed the results of previous one and symptoms of dwarfism were observed only in pots treated with TB. Data analysis showed that toxicity of TB was affected by dosage, time of application and water level significantly (P<0.0001). According to these results applying the TB in saturated soils was three times more toxic for transplanted rice compared with flooded pots, and there was a direct significant (P<0.001) sigmoidal relation (r2>95%) between dosages and toxicity of TB. Spraying TB after transplanting compared with before transplanting decreased dwarfness intensity significantly. Based on the results of this study for management of TB toxicity in paddy rice it is needed the herbicide to be applied in flooded soils, and after transplanting in minimum recommended doses.

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APA: Copy

YAGHOUBI, BIJAN, ALIZADEH, HASSAN, BAGHESTANI, MOHAMMAD ALI, DAVATGAR, NASER, & RAHIMIAN, HAMID. (2010). COMPARISON OF SOME HERBICIDES ON CAUSING THE DWARFNESS ON RICE. IRANIAN JOURNAL OF WEED SCIENCE, 6(2), 23-40. SID. https://sid.ir/paper/185289/en

Vancouver: Copy

YAGHOUBI BIJAN, ALIZADEH HASSAN, BAGHESTANI MOHAMMAD ALI, DAVATGAR NASER, RAHIMIAN HAMID. COMPARISON OF SOME HERBICIDES ON CAUSING THE DWARFNESS ON RICE. IRANIAN JOURNAL OF WEED SCIENCE[Internet]. 2010;6(2):23-40. Available from: https://sid.ir/paper/185289/en

IEEE: Copy

BIJAN YAGHOUBI, HASSAN ALIZADEH, MOHAMMAD ALI BAGHESTANI, NASER DAVATGAR, and HAMID RAHIMIAN, “COMPARISON OF SOME HERBICIDES ON CAUSING THE DWARFNESS ON RICE,” IRANIAN JOURNAL OF WEED SCIENCE, vol. 6, no. 2, pp. 23–40, 2010, [Online]. Available: https://sid.ir/paper/185289/en

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