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vol. 11, nr. 1 (2008)
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Effect of herbicides and herbicide combinations and of the method of nitrogen application on winter wheat yielding and yield structure
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Irena Brzozowska, Jan Brzozowski, Maria Hruszka, Bartosz Witkowski
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Department of Farming Systems, University of Warmia and Mazury, pl. Łódzki 3, 10-718 Olsztyn |
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vol. 11 (2008), nr. 1,
pp. 33-44
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abstract:
The study was aimed at determining the effect of selected herbicides and their combinations as well as of nitrogen fertilization and foliar supplementation of winter wheat on yielding and yield structure. A field experiment with cultivation of winter wheat var. Elena was carried out in the years 2000-2003 at the University of Warmia and Mazury in Olsztyn Experimental Station in Tomaszkowo. Wheat was cultivated annually after winter wheat, on class IIIa and IIIb heavy and medium-heavy brown soil, ranked as a good wheat complex. The first experimental factor were various methods of chemical weed control. The second experimental factor were variants of nitrogen fertilization (soil applied and soil-foliar applied). Herbicides and herbicide mixtures exerted a significant effect on the yielding of winter wheat. The best yield-protective results were obtained by using 2 mixtures: Granstar 75 WG + Chwastox Extra 300 SL (6.45 t ha-1 on average) and Granstar 75 WG + Starane 250 EC (6.43 t ha-1). In turn, the worst results were observed in the case of Chwastox Extra 300 SL herbicide (6.20 t ha-1 on average). Variants of nitrogen fertilization did not diversify grain yield. Of the two factors examined, only the method of chemical weed con-trol was found to significantly diversify spike density and 1000 kernel mass. The yield of wheat was affected to the greatest extent by the number of spikes per area size, followed by 1000 kernel mass, and to the least extent – by the number of kernels in a spike.
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keywords:
winter wheat, herbicides, nitrogen application method, yield, yield structure
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original in:
English
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