Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 21 ISSUE 2
Written by Mihai BERCA, Valentina-Ofelia ROBESCU, Roxana HOROIAȘ

In a trifactorial experiment, crop rotation x years x treatments, performed in the south of Romania, on the leached chernozem soil from the Burnas Plain, some concrete results have been obtained. There is a negative correlation between the degree of crop weeding and the level of Josef wheat yield. In monoculture, after 10 years of experimentation, about 40 t weeds biomass/ha have been registered (5 → 40). Over the same period, yield decreased from 62 q/ha to about 23 q/ha (–39 q/ha). Carrying out two herbicide treatments (autumn and spring) reduced the weeds quantity to 15 t/ha, ie three times lower, and the yield from 62 to 35 q/ha (–27 q/ha) at the end of the research period. Herbicide treatments performed on the farm model have been ineffective in wheat monoculture. In crop rotation, decreases in yields without treatments, after 10 years, are significant, but without exceeding 10 q/ha. Under treatment conditions, in the 4-years crop rotation (peas-wheat-rape-wheat = P-W-R-W) the harvest level remains uniform or slightly increases, from 61 to 63 q/ha (insignificant). The lack of herbicides reduces yields twice as much in monoculture, compared to crop rotation. Monoculture also reduces the effect of herbicide treatments. In addition to the accumulation of a much larger biomass of weeds, there are also hard-to-fight species, such as Cirsium, Convolvulus, Matricaria. The density of annual and even perennial grasses (Avena fatua, Setaria glauca and Sorghum halepense) also increases

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