13 November 1998

Nitrogen shortfall fear

LESS nitrogen left in the soil after strobilurin treated cereals could affect following crops, says one manufacturer.

"There is a consequential reduction in nitrogen after the use of Landmark, which could have rotational implications," says BASF product manager Steve Waterhouse.

Autumn rape establishment, in particular, could suffer where strobilurin-treated cereals have extracted more N from the soil.

But he advises against applying more nitrogen to strobilurin-treated crops. "Growers must balance nitrogen use with other inputs such as pgrs and be aware of the risks of going over the top. Think about the extra yields demand for nitrogen, that is all," Mr Waterhouse says.

Less winter leaching of nitrogen could be an additional environmental benefit, he adds.