Crop rotation with high proportion of wheat: is it possible to avoid disadvantages? | Rotations de cultures chargees en ble: est-il possible d'en diminuer les inconvenients?
2007
Vullioud, P.,Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland)
A long term experiment has taken place 1967 at Changins to test different cropping techniques supposed to avoid the disadvantages of wheat monoculture. From 1977, three additional treatments have been added to the experiment: an unploughed crop rotation Wheat-Rape-Wheat-Maize, a ploughed crop rotation Wheat-Rape-Wheat-Maize and a ploughed crop rotation Wheat-Rape-Wheat-Oat. The yield decline in the wheat monoculture from 1969 to 1977 reached 33% (17 dt/ha) in the ploughed treatment and 25% (14.2 dt/ha) in the unploughed treatment. From 1978 to 2004, the average wheat yield of the three treatments including a crop rotation where quite similar at a level of 56 dt/ha. During the same period of time, the yield of the wheat monoculture reached 48.3 dt/ha in the ploughed treatment and 49.8 dt/ha in the unploughed treatment. Different techniques of straw management, nitrogen fertilization and stubble-cleaning have been sequentially tested in order to minimize the disadvantages of the wheat monoculture as well as crop rotations with high wheat proportion. No practical conclusion could be derived from the results.
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