Abstract
MOST soils in southern Australia were initially of low nitrogen status, and bare fallows were generally used to provide mineral nitrogen for cereal crops. In more recent years a ley system based on subterranean clover (Trifolium subterraneum L.) pastures has been introduced to counter decline in soil fertility, weed infestation and other factors. Much higher levels of available nitrogen now occur than under previous conditions, particularly in the season immediately following the ley.
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FRENEY, J., LIPSETT, J. Yield Depression in Wheat due to High Nitrate Applications, and its Alleviation by Molybdenum. Nature 205, 616–617 (1965). https://doi.org/10.1038/205616a0
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DOI: https://doi.org/10.1038/205616a0
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