[Results of an over 20 year no-tillage trial at Changins. IV. Seed stock and weed control]

Mayor, J.-Ph.; Maillard, A.

[Results of an over 20 year no-tillage trial at Changins. IV. Seed stock and weed control]

1995

Mayor, J.-Ph. | Maillard, A. (Station federale de recherches agronomiques de Changins, Nyon (Switzerland))

Since 1969 a long term tillage trial has been conducted at Changins on a brown calcareous soil with 27 % clay and 44 % silt. Three no-tillage techniques are compared with conventional mouldboard ploughing. The techniques differ mainly in their working depth. The crop rotation consists of winter rape, winter wheat, maize and winter wheat. Wheat straw is removed by baling; rape straw and maize stalks are chopped. Compared to conventional ploughing, ploughless tillage did not modify considerably the density of the seed stock in the soil. It lead, however, to a bigger diversity. The reduction of the tillage depth in the unploughed plots increased the population of perennial weeds. Weed control is slightly more intensive in no-tillage systems than with conventional tillage

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