Impact of reduced tillage on the weed flora in spring cereals
1996
Skuterud, R. | Semb, K. | Saur, J. (Planteforsk - Norsk Inst. for Planteforskning, Plantevernet (Norway). Avd. Ugras) | Mygland, S.
In 38 large scale experiments in cereal growing areas in Norway, different systems of reduced tillage were compared with conventional autumn ploughing and spring ploughing. Registrations of weeds both before spraying in the early summer and before harvesting in the autumn showed that reduced tillage caused an increase in weeds compared to autumn ploughing. Spring harrowing only, or direct drilling or rotavating in the spring, caused most weeds. Winter annuals, biennials and the perennials increased more than summer annuals, and monocots increased more than dicots when tillage was reduced. The number of weeds in early summer increased rapidly over years, most after reduced tillage. The biomass of weeds assessed visually before harvest did not increase over the years.
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