Effect of the herbicide treatment dose on the weed infestation in common winter wheat

Z. Petrova*

Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria
(Manuscript received 10 June 2017; accepted for publication 24 October 2017)

Abstract. The aim of this investigation was to determine the effect of the treatment dose of herbicides on the weed infestation in common winter wheat. The investigations were carried out during 2015 –2016 at Dobrudzha Agricultural Institute (DAI) – General Toshevo. The following herbicides were used: Derby super WG (33 g/ha; 66 g/ha; 132 g/ha), Secator ОD (100 ml/ha; 200 ml/ha; 400 ml/ha), Ergon WG (50 g/ha; 100 g/ha; 200 g/ha), Granstar super 50SG (40 g/ha; 80 g/ha; 160 g/ha), Lintur 70WG (150 g/ha; 300 g/ha; 600 g/ha) and Mustang 306.25 СК (800 ml/ha; 1600 ml/ha; 3200 ml/ha) from the group of sulfunylureas with various mechanism of action. The preparations were applied at three doses – optimal, double and quadruple, at stage 29 (according to Zadoks et al., 1974) of common winter wheat cultivars Dragana, Zlatitsa and Kalina. The herbicide effect was determined by the quantitative weight method and evaluated by the EWRS scale. Regardless of the used dose and the cultivar, Derby super WG, Secator OD, Lintur 70WG and Mustang 306.25СК had highest efficiency (100%) against the following investigated weeds: Sinapis arvensis L., Matricaria chamomilla L., Anthemis arvensis L., Galium tricorne (Stock.), Consolida orientalis (J. Gay) and Cirsium arvensis L. Ergon WG and Granstar super 50SG had 100% efficiency against Sinapis arvensis L., Matricaria chamomilla L. and Anthemis arvensis L. and lower effect (90-94%) on Galium tricorne (Stock), Consolida orientalis (J. Gay) and Cirsium arvensis L.

Effect of the date of application of a set of herbicides in common winter wheat crops on weed infestation

Z. Petrova*, G. Sabev

1Department of Agrotechnology, Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria

Abstract. The aim of this investigation was to determine the effect of the date of introduction of herbicides on the infestation with weeds. The experiments were carried out during 2012 – 2013 at Dobrudzha Agricultural Institute (DAI). The following herbicides were used: Derby super VG (33 g/ha), Palace 75WG + oil (250 + 1000 g/ml/ha), Granstar 75DF (15 g/ha), Lintur 70VG (150 g/ha), Husar Max OD (1000 ml/ha), Secator OD (100 ml/ha), Mustang 306, 25 CK (800 ml/ha) from the group of sulphonylureas with various modes of activity. The preparations were introduced at three phenophases of winter common wheat cultivar Aglika (29, 32 and 37 according to the scale of Zadoks). The herbicide effect was determined by a quantitative weight method and evaluated by the EWRS scale. The results from the obtained data showed that Derby super VG, Luntur 70VG, Secator OD and Mustang 306, 25 CK had the highest effect when introduced at phenophases 29 of wheat growth (the efficiency varied from 95 % to 100 %). With the later dates of herbicide application and the later growth stages of weeds, a tendency towards lower efficiency was observed.

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Productive performance and quality of essential oil from oil bearing rose (Rosa damascena mill) for use of oxadiargyl

D. Angelova

Abstract. The survey was conducted during the period 2009 – 2010 at IREMC – Kazanlak. The experiment is set in four iterations at a plantation of roses /R. damascena Mill./. We examined herbicide efficacy and selectivity of oxadiargyl /Raft 400 SC/ applied as soil herbicide before vegetation at a dose of 1,2 l/ha and 1,5 l/ha. It was found that a higher level of performance against annual and perennial weeds is Raft 400 SC applied at a dose of 1,5 l/ha. The herbicide has excellent selectivity for the oil-bearing rose. When using the two concentrations positive and statistically proven differences in production traits were found at P= 5% and P = 1.

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