Influence of herbicides on yield stability of winter wheat cultivars under different sowing rates

Document Type : Research Paper


Institute of Soil Science and Plant Cultivation, Department of Weed Science and Tillage Systems, Wrocław, Poland.


Yield variability of selected winter wheat cultivars under different sowing
rate and selected application, was investigated during 2006-2008, in the Lower
Silesia region (South-West Poland). Experiments with two varieties, two levels
of sowing rate and seven herbicides, including untreated object were set up on the
same field, using split-plot method. For evaluation of yield stability Kang's yieldstability
statistic (YS) was applied. Examined herbicides did not influence grain yield
of both cultivars, at standard wheat density (450 seeds/m2). Under low density,
Kobra Plus variety showed variable reaction to herbicides. Iodosulfuron methyl
sodium + diflufenican + mezosulfuron methyl, mecoprop + MCPA + dicamba and
iodosulfuron methyl sodium + amidosulfuron resulted in yield increment in
comparison with untreated object, whilst dicamba + triasulfuron gave opposing
effect. Yield stability at different herbicide objects during 3-years period was
considerably variable and dependent on cultivar and sowing rate. Yield of both
cultivars, obtained from plots treated with iodosulfuron methyl sodium + diflufenican +
mezosulfuron methyl, iodosulfuron methyl sodium + amidosulfuron and mecoprop +
MCPA + dicamba, under low density was comparable with standard sowing.