TY  - JOUR
AU  - Knežević, Stevan Z.
AU  - Elezović, Igor
AU  - Datta, Avishek
AU  - Vrbničanin, Sava
AU  - Glamočlija, Đorđe
AU  - Simić, Milena
AU  - Malidža, Goran
PY  - 2013
UR  - http://fiver.ifvcns.rs/handle/123456789/1224
AB  - The critical time for weed removal (CTWR) is a period in the crop growth cycle when weed control must be initiated to prevent yield losses. Knowing the CTWR is useful for making decisions about the timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in the USA to determine the CTWR in imidazolinone (IMI)-resistant sunflower grown with and without application of pre-emergence (PRE) herbicide. A four-parameter log-logistic model was fitted to data relating relative crop yield to increasing duration of weed presence. The CTWR without PRE herbicide treatment ranged from 14 to 26d after emergence (DAE) corresponding to the V3 (three leaves) to V4 stages compared to 25 to 37 DAE, which corresponded to the V6 to V8 stages with PRE herbicide. The CTWR in IMI-resistant sunflower grown with PRE herbicide can be delayed by an additional 6 to 12 d compared to the crop grown without PRE herbicide under the present experimental conditions. The practical implication of this study is that the use of PRE herbicide could extend post-herbicide treatments by another 6 to 12d with respect to the critical time required for weed removal without PRE herbicide in IMI-resistant sunflower.
PB  - Taylor & Francis Ltd, Abingdon
T2  - International Journal of Pest Management
T1  - Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide
EP  - 235
IS  - 3
SP  - 229
VL  - 59
DO  - 10.1080/09670874.2013.830797
ER  - 

@article{
author = "Knežević, Stevan Z. and Elezović, Igor and Datta, Avishek and Vrbničanin, Sava and Glamočlija, Đorđe and Simić, Milena and Malidža, Goran",
year = "2013",
abstract = "The critical time for weed removal (CTWR) is a period in the crop growth cycle when weed control must be initiated to prevent yield losses. Knowing the CTWR is useful for making decisions about the timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in the USA to determine the CTWR in imidazolinone (IMI)-resistant sunflower grown with and without application of pre-emergence (PRE) herbicide. A four-parameter log-logistic model was fitted to data relating relative crop yield to increasing duration of weed presence. The CTWR without PRE herbicide treatment ranged from 14 to 26d after emergence (DAE) corresponding to the V3 (three leaves) to V4 stages compared to 25 to 37 DAE, which corresponded to the V6 to V8 stages with PRE herbicide. The CTWR in IMI-resistant sunflower grown with PRE herbicide can be delayed by an additional 6 to 12 d compared to the crop grown without PRE herbicide under the present experimental conditions. The practical implication of this study is that the use of PRE herbicide could extend post-herbicide treatments by another 6 to 12d with respect to the critical time required for weed removal without PRE herbicide in IMI-resistant sunflower.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "International Journal of Pest Management",
title = "Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide",
pages = "235-229",
number = "3",
volume = "59",
doi = "10.1080/09670874.2013.830797"
}

Knežević, S. Z., Elezović, I., Datta, A., Vrbničanin, S., Glamočlija, Đ., Simić, M.,& Malidža, G.. (2013). Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide. in International Journal of Pest Management
Taylor & Francis Ltd, Abingdon., 59(3), 229-235.
https://doi.org/10.1080/09670874.2013.830797

Knežević SZ, Elezović I, Datta A, Vrbničanin S, Glamočlija Đ, Simić M, Malidža G. Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide. in International Journal of Pest Management. 2013;59(3):229-235.
doi:10.1080/09670874.2013.830797 .

Knežević, Stevan Z., Elezović, Igor, Datta, Avishek, Vrbničanin, Sava, Glamočlija, Đorđe, Simić, Milena, Malidža, Goran, "Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide" in International Journal of Pest Management, 59, no. 3 (2013):229-235,
https://doi.org/10.1080/09670874.2013.830797 . .

TY  - JOUR
AU  - Elezović, Igor
AU  - Datta, Avishek
AU  - Vrbničanin, Sava
AU  - Glamočlija, Đorđe
AU  - Simić, Milena
AU  - Malidža, Goran
AU  - Knežević, Stevan Z.
PY  - 2012
UR  - http://fiver.ifvcns.rs/handle/123456789/1066
AB  - With an increase in the use of imidazolinone (IMI)-resistant sunflower, it is important to determine the influence of weed interference and herbicide presence on seed yield and yield components of sunflower. The objective of this study was to determine the effect of different periods of weed presence on seed yield and yield components of IMI-resistant sunflower grown with and without ore-emergence (PRE) herbicide. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in Nebraska, USA. A four-parameter log-logistic model described relationship between the crop yield and yield components to increasing duration of weed presence. Sunflower yield and yield components varied between years and among locations. Increasing periods of weed interference decreased yield and yield components of sunflower; however, the reductions were greater without PRE herbicide compared to the PRE herbicide treated plots. The length of time weeds could remain in the crop grown without PRE herbicide ranged from 14 to 26 days after emergence (DAE), which corresponded to the V3 (three leaves) to V4 growth stages on the basis of the 5% acceptable yield loss level. The duration of time that weeds could remain in the crop grown with PRE herbicide ranged from 25 to 37 DAE, which corresponded to the V6-V8 growth stages of sunflower. Practical implication of this study is that post-emergence weed control in IMI-resistant sunflower grown with PRE herbicide can be delayed approximately by two weeks compared to the crop grown without PRE herbicide.
PB  - Elsevier Science Bv, Amsterdam
T2  - Field Crops Research
T1  - Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal
EP  - 146
SP  - 137
VL  - 128
DO  - 10.1016/j.fcr.2011.12.020
ER  - 

@article{
author = "Elezović, Igor and Datta, Avishek and Vrbničanin, Sava and Glamočlija, Đorđe and Simić, Milena and Malidža, Goran and Knežević, Stevan Z.",
year = "2012",
abstract = "With an increase in the use of imidazolinone (IMI)-resistant sunflower, it is important to determine the influence of weed interference and herbicide presence on seed yield and yield components of sunflower. The objective of this study was to determine the effect of different periods of weed presence on seed yield and yield components of IMI-resistant sunflower grown with and without ore-emergence (PRE) herbicide. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in Nebraska, USA. A four-parameter log-logistic model described relationship between the crop yield and yield components to increasing duration of weed presence. Sunflower yield and yield components varied between years and among locations. Increasing periods of weed interference decreased yield and yield components of sunflower; however, the reductions were greater without PRE herbicide compared to the PRE herbicide treated plots. The length of time weeds could remain in the crop grown without PRE herbicide ranged from 14 to 26 days after emergence (DAE), which corresponded to the V3 (three leaves) to V4 growth stages on the basis of the 5% acceptable yield loss level. The duration of time that weeds could remain in the crop grown with PRE herbicide ranged from 25 to 37 DAE, which corresponded to the V6-V8 growth stages of sunflower. Practical implication of this study is that post-emergence weed control in IMI-resistant sunflower grown with PRE herbicide can be delayed approximately by two weeks compared to the crop grown without PRE herbicide.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Field Crops Research",
title = "Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal",
pages = "146-137",
volume = "128",
doi = "10.1016/j.fcr.2011.12.020"
}

Elezović, I., Datta, A., Vrbničanin, S., Glamočlija, Đ., Simić, M., Malidža, G.,& Knežević, S. Z.. (2012). Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal. in Field Crops Research
Elsevier Science Bv, Amsterdam., 128, 137-146.
https://doi.org/10.1016/j.fcr.2011.12.020

Elezović I, Datta A, Vrbničanin S, Glamočlija Đ, Simić M, Malidža G, Knežević SZ. Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal. in Field Crops Research. 2012;128:137-146.
doi:10.1016/j.fcr.2011.12.020 .

Elezović, Igor, Datta, Avishek, Vrbničanin, Sava, Glamočlija, Đorđe, Simić, Milena, Malidža, Goran, Knežević, Stevan Z., "Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal" in Field Crops Research, 128 (2012):137-146,
https://doi.org/10.1016/j.fcr.2011.12.020 . .

TY  - JOUR
AU  - Ulloa, Santiago M.
AU  - Datta, Avishek
AU  - Malidža, Goran
AU  - Leskovsek, Robert
AU  - Knežević, Stevan Z.
PY  - 2010
UR  - http://fiver.ifvcns.rs/handle/123456789/786
AB  - Weed management is a major constraint in organic crop production. Propane flaming could be an additional tool for weed control in organic soybean production. The objective of this study was to investigate the response of soybean to broadcast flaming as influenced by propane dose and crop growth stage. We initiated a 2-year field study at the Haskell Agricultural Laboratory of the University of Nebraska, Concord, NE using five propane doses applied at four growth stages of VC (unfolded cotyledons), VU (fully unrolled unifoliate leaves), V2 (second trifoliate stage) and V5 (fifth trifoliate stage). The propane doses tested were 0, 13, 24,44 and 85 kg ha(-1). Flaming treatments were applied utilizing a custom-built research flamer mounted on the back of a four-wheeler driven at a constant speed of 6.4 km h(-1). The response of soybean to propane flaming was described by using log-logistic models on the basis of visual ratings of crop injury, yield components (plants m(-2), branches plant(-1), pods plant(-1), seeds pod(-1) and 100-seed weight) and grain yield. In general, soybean at VC stage was the most tolerant whereas VU stage was the most susceptible to broadcast flaming resulting in the highest visual crop injury, and the largest loss of yield and its components. The maximum yield reductions with the highest propane dose were 19%, 96%, 54% and 30% for VC, VU, V2 and V5 stages, respectively. An arbitrarily assigned 5% yield reduction was evident with 55, 13, 21 and 47 kg ha(-1) propane for VC, VU, V2 and V5 growth stages, respectively, suggesting that soybean flamed at VC stage can tolerate higher dose of propane for the same yield reduction compared to other growth stages. It appears that flaming has a potential to be used effectively in organic soybean production when conducted properly at VC stage.
PB  - Elsevier Science Bv, Amsterdam
T2  - Field Crops Research
T1  - Yield and yield components of soybean [Glycine max (L.) Merr.] are influenced by the timing of broadcast flaming
EP  - 354
IS  - 2-3
SP  - 348
VL  - 119
DO  - 10.1016/j.fcr.2010.08.006
ER  - 

@article{
author = "Ulloa, Santiago M. and Datta, Avishek and Malidža, Goran and Leskovsek, Robert and Knežević, Stevan Z.",
year = "2010",
abstract = "Weed management is a major constraint in organic crop production. Propane flaming could be an additional tool for weed control in organic soybean production. The objective of this study was to investigate the response of soybean to broadcast flaming as influenced by propane dose and crop growth stage. We initiated a 2-year field study at the Haskell Agricultural Laboratory of the University of Nebraska, Concord, NE using five propane doses applied at four growth stages of VC (unfolded cotyledons), VU (fully unrolled unifoliate leaves), V2 (second trifoliate stage) and V5 (fifth trifoliate stage). The propane doses tested were 0, 13, 24,44 and 85 kg ha(-1). Flaming treatments were applied utilizing a custom-built research flamer mounted on the back of a four-wheeler driven at a constant speed of 6.4 km h(-1). The response of soybean to propane flaming was described by using log-logistic models on the basis of visual ratings of crop injury, yield components (plants m(-2), branches plant(-1), pods plant(-1), seeds pod(-1) and 100-seed weight) and grain yield. In general, soybean at VC stage was the most tolerant whereas VU stage was the most susceptible to broadcast flaming resulting in the highest visual crop injury, and the largest loss of yield and its components. The maximum yield reductions with the highest propane dose were 19%, 96%, 54% and 30% for VC, VU, V2 and V5 stages, respectively. An arbitrarily assigned 5% yield reduction was evident with 55, 13, 21 and 47 kg ha(-1) propane for VC, VU, V2 and V5 growth stages, respectively, suggesting that soybean flamed at VC stage can tolerate higher dose of propane for the same yield reduction compared to other growth stages. It appears that flaming has a potential to be used effectively in organic soybean production when conducted properly at VC stage.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Field Crops Research",
title = "Yield and yield components of soybean [Glycine max (L.) Merr.] are influenced by the timing of broadcast flaming",
pages = "354-348",
number = "2-3",
volume = "119",
doi = "10.1016/j.fcr.2010.08.006"
}

Ulloa, S. M., Datta, A., Malidža, G., Leskovsek, R.,& Knežević, S. Z.. (2010). Yield and yield components of soybean [Glycine max (L.) Merr.] are influenced by the timing of broadcast flaming. in Field Crops Research
Elsevier Science Bv, Amsterdam., 119(2-3), 348-354.
https://doi.org/10.1016/j.fcr.2010.08.006

Ulloa SM, Datta A, Malidža G, Leskovsek R, Knežević SZ. Yield and yield components of soybean [Glycine max (L.) Merr.] are influenced by the timing of broadcast flaming. in Field Crops Research. 2010;119(2-3):348-354.
doi:10.1016/j.fcr.2010.08.006 .

Ulloa, Santiago M., Datta, Avishek, Malidža, Goran, Leskovsek, Robert, Knežević, Stevan Z., "Yield and yield components of soybean [Glycine max (L.) Merr.] are influenced by the timing of broadcast flaming" in Field Crops Research, 119, no. 2-3 (2010):348-354,
https://doi.org/10.1016/j.fcr.2010.08.006 . .