On the impact of the pre-emergent crop on weeding in soy, winter wheat, sunflower, barley, maize, and oat crops

Abstract

In this study we aim at presenting the evolution of the weeding degree in six crops depending on the pre-emergent crops. In the experimental year 2006, the natural weeding state of each crop under study in monoculture had the following values: 80.10 weeds/m2 in soy, 81.10 weeds/m2 in winter wheat, 180.20 weeds/m2 in maize, 93.00 weeds/m2 in barley, 142.00 weeds/m2 in sunflower, and 121.00 weeds/m2 in spring oat. The impact of the pre emergent crop results in a diminution of the weeding degree, as follows: 18.25-30.12% in soy, 20.92-28.68% in winter wheat, 20.16-31.17% in sunflower, 22.16-30.96% in barley, 21.45-29.43% in maize, and 16.73 25.75% in oat. The pre-emergent crop had un important influence on yield level in six crops, the productivity being in correlation with weeding degree and having the following values: 17,26-22,8 q/ha in soy, 35,3-42,96 q/ha in winter wheat, 20,48 -24,75 q/ha in sunflower, 32,40-38,88 q/ha in barley, 48,00-50,80 q/ha in maize, and 16,38-19,25 q/ha in oat.