Weed infestation of cereals in relationship to forecrops
1995
Kohout, V. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
In long-term investigation of weed of winter wheat and spring barley stands investigation in Central and Eastern Bohemia great differences in weed infestation by some weed species were recorded in different years in dependence on forecrops. In investigated winter wheat stands the occurrence of fertile stems of coach grass much varied and the most occurred in wheat stands cultivated after clover crops, above all, after sugar beet, potatoes, and winter rape as well. In spring barley stands the coach grass appeared much less. The highest incidence was recorded after cereals as forecrops, especially after winter wheat, basically, it did not occur after sugar beet. Marked differences were achieved in the occurrence of fertile panicles of coach grass between stands of winter wheat and spring barley , greater weed infestation was in spring barley. The coach grass occurred least in winter wheat cultivated after clover crops, but also after winter rape in the crop rotation: winter barley, winter wheat. In winter barley coach grass appeared the most if it was cultivated after cereals as forecrops, especially spring crops, but also on heavier soils and after sugar beet and silage maize. In investigation of weed infestation of stands of winter and spring cereals literary data have been confirmed on significantly higher representation and greater production of generative organs in silky bent grass, bedstraw, and scentless mayweed in winter wheat stands than in spring barley stands regardless of the forecrop.
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