Investigation into weed control by different methods of stubble tillage

In a field experiment for weed control by stubble tillage at the experimental field Goldener Acker in Hohenheim the effect of four methods of stubble tillage (stubble fallow, shallow ploughing, grubber cultivation and rotavating) was tested on weed development and yields in a cereals based crop sequence (spring barley - oats - winter barley - 5 crops (spring wheat, maize, faba beans, peas and hemp)). The tilled variants were never plowed. Stubble tillage after cereal harvest by rotavating increased the density of Alopecurus myosuroides in the following crops as well as grubber cultivation. Stubble fallow without any tillage operation 2 to 3 month leads to a closed thistle population after planting spring wheat after winter barley. Shallow ploughing, using a Stoppelhobel, was reducing weed population drastically, in part to zero. Depending on competitive power the cultivated crops reacted with yield depression to the weed infestation.