The effects of fumigation, rotation with lupins, and nitrogen application on plant growth and common root rot of wheat at Geraldton, Western Australia [Bipolaris sorokiniana]
1990
Wilson, J.M. (Western Australian Dept. of Agriculture, Geraldton) | Hamblin, J. (Western Australian Dept. of Agriculture, Albany)
In field experiments, fumigation increased yields at levels of applied N of 25 kg per ha or greater, and was associated with reduced incidence and severity of common root rot. Common root rot was negatively correlatd with biological and grain yield at applied N levels of 50 kg per ha, but not at nil N. While fumigation increased soil ammonium and decreased soil nitrate levels, these factors were discounted as contributing significantly to the variations in yield. Rotation with lupins increased mid-season growth at all levels of applied N, but only increased grain yield at the nil levels of N. Thus while lupin rotation may have had a 'cleaning' effect early in the season, its benefits to final yield appeared to have been largely due to residual N.
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