Tag Archives: efficacy

xxx Z. Pacanoski and A. Mehmeti
Pre-emergence grass weed control in winter wheat (Triticum aestivum L.) with soil applied premixed herbicides influenced by precipitations
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Pre-emergence grass weed control in winter wheat (Triticum aestivum L.) with soil applied premixed herbicides influenced by precipitations

Z. Pacanoski¹ and A. Mehmeti²*

¹Ss. Cyril and Methodius University in Skopje, Faculty of Agricultural Sciences and Food, 16-ta Makedonska brigada 3, MK1000 Skopje, Republic of North Macedonia
²University of Prishtina, Department of Plant Protection, Bill Clinton p.n., XK10000 Prishtina, Republic of Kosovo
*Corresponding address: arben.mehmeti@uni-pr.edu

Abstract:

The field trials were conducted during two winter wheat growing seasons (2013–2014 and 2014–2015, respectively) to estimate weed control, and influence of herbicides on grain yield with PRE premixes in winter wheat crops. The field trials were conducted with ‘Ingenio’ and ‘Pobeda’ winter wheat cultivars which were sowed in a well-prepared soil seedbed at a seeding rate of 220 and 240 kg ha-1. The experimental design was a randomised complete block with four replicates and elementary plots 25 m2. The efficacy of PRE herbicides varied with treatments among weed species and periods of efficacy estimation, regions and years, respectively. Overall, the performance of the PRE herbicide premixes correlated with the weather conditions. All PRE herbicide premixes effectively reduced the dominant weed species Milium vernale, Papaver rhoeas, and Galium aparine in the Bitola region in 2013–2014, but not in 2014–2015 due to heavy rain during the first two weeks of herbicide application. In contrast, the limited precipitation after PRE application may have contributed to the poor performance of PRE herbicides in the Probištip region in 2013 compared with 2014. In the Bitola region, the lowest crop yield was obtained in plots treated with diflufenican + isoproturon (2,960 kg ha-1) in both growing seasons. In the Probištip region, the wheat grain yields in 2013–2014 following all PRE applied herbicides were significantly lower (between 520 and 800 kg ha-1) than weed-free control. In 2014–2015, diflufenican + isoproturon herbicide treatment produced the lowest yield of 2,530 kg ha-1, whereas chlortoluron + triasulfuronwas the highest-yielding herbicide treatment (2,820 kg ha-1). However, results indicated that in Bitola region comparatively higher yield were found in plots treated with chlortoluron + triasulfuron (3,450 kg ha-1), in both growing seasons, also in Probistip region herbicide chlortoluron + triasulfuron achieved higher yield (2,820 kg ha-1), in both growing seasons).

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1796-1808 Z. Pacanoski and A. Mehmeti
POST herbicide programme for effective weed control in winter wheat (Triticum aestivum L.)
Abstract |
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POST herbicide programme for effective weed control in winter wheat (Triticum aestivum L.)

Z. Pacanoski¹ and A. Mehmeti²*

¹University Ss. Cyril and Methodius, Faculty for Agricultural Sciences and Food, 16-ta Makedonska brigada 3, MK1000 Skopje, Republic of Macedonia
²University of Prishtina, Department of Plant Protection, Bill Clinton p.n., XK10000 Prishtina, Republic of Kosovo
*Correspondence: arben.mehmeti@uni-pr.edu

Abstract:

Field experiments were conducted during two winter wheat-growing seasons to evaluate the efficacy of some new POST herbicides and herbicide combinations for those effective controls of weeds in winter wheat crops in the Republic of Macedonia. The weed population consisted mainly of annual winter and spring and some perennial weeds. Weediness comprised 116 and 208 plants m-2 in 2012–2013 and 2013–2014, respectively, in the Skopje region, and 93 and 114 plants m-2 in 2012–2013 and 2013–2014, respectively, in the Probištip region. All POST herbicides effectively reduced dominant weeds density (> 93%) in the Skopje region in both years, as well as in the Probištip region in 2012–2013, but not in 2013–2014. In this year, lower temperature directly following application decreased efficacy of POST applied herbicides, which provided control of Lolium perenne that was between 76 and 84%; control of A. ludoviciana was less than 85%; control of B. radians was no more than 83% and no one treatment controlled P. convolvulus more than 82%. Wheat yields in the Skopje region were not significant among years for the different POST herbicide applications and ranged between 3,580 and 3,720 kg ha-1 in 2012–2013, and between 3,760 and 3,910 kg ha-1 in 2013–2014. A significant treatment by year interaction resulted in two distinct years for wheat yields in the Probištip region with POST herbicides. In 2012–2013, wheat yields were between 3,230 and 3,390 kg ha-1, but in 2013–2014, wheat yields ranged from 3,060 to 3,490 kg ha-1 and weed-free control showed a significant higher wheat yield compared to all evaluated herbicides.

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