The nitrogen economy of broadacre lupin in southwest Australia

M.J. Unkovich, John Pate, J. Hamblin

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    The time courses of above- and below-ground accumulation of biomass and N were followed in a crop of narrowleaf lupin (Lupinus angustifolius L. cv. Illyarrie) at Geraldton, W.A., and concurrent N-2 fixation assessed using the N-15 natural abundance technique. Crop biomass peaked at 10 t DM and 231 kg N ha(-1) with 13% of this N below ground. The crop accumulated the bulk (90 degrees) of its N through symbiotic N-2 fixation. Of the 164 kg total plant N ha(-1) remaining in recoverable biomass at maturity 44 degrees was recovered as grain, 49 degrees as other above-ground residues and 7% as roots. Despite a decrease in recoverable N of 67 kg ha(-1) between peak biomass and maturity, 96 kg N ha(-1) was returned as crop residues after grain harvest. Investigation of six farm crops in the study region gave values for nitrogen accumulation at peak biomass ranging from 199 to 372 kg ha(-1) of which, on average, 86% (222 kg ha(-1)) was fixed from the atmosphere. Predicted N returns to the soil from fixation averaged 65 kg ha(-1), though the range (32-96 kg ha(-1)) indicated that south-west Australian lupin crops provide somewhat variably sized pools of mineralizeable crop residues for following cereal growth.
    Original languageEnglish
    Pages (from-to)149-164
    JournalCrop and Pasture Science
    Volume45
    DOIs
    Publication statusPublished - 1994

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    Lupinus
    biomass
    nitrogen
    crops
    crop residues
    Lupinus angustifolius
    biomass production
    farms
    soil
    methodology

    Cite this

    Unkovich, M.J. ; Pate, John ; Hamblin, J. / The nitrogen economy of broadacre lupin in southwest Australia. In: Crop and Pasture Science. 1994 ; Vol. 45. pp. 149-164.
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    abstract = "The time courses of above- and below-ground accumulation of biomass and N were followed in a crop of narrowleaf lupin (Lupinus angustifolius L. cv. Illyarrie) at Geraldton, W.A., and concurrent N-2 fixation assessed using the N-15 natural abundance technique. Crop biomass peaked at 10 t DM and 231 kg N ha(-1) with 13{\%} of this N below ground. The crop accumulated the bulk (90 degrees) of its N through symbiotic N-2 fixation. Of the 164 kg total plant N ha(-1) remaining in recoverable biomass at maturity 44 degrees was recovered as grain, 49 degrees as other above-ground residues and 7{\%} as roots. Despite a decrease in recoverable N of 67 kg ha(-1) between peak biomass and maturity, 96 kg N ha(-1) was returned as crop residues after grain harvest. Investigation of six farm crops in the study region gave values for nitrogen accumulation at peak biomass ranging from 199 to 372 kg ha(-1) of which, on average, 86{\%} (222 kg ha(-1)) was fixed from the atmosphere. Predicted N returns to the soil from fixation averaged 65 kg ha(-1), though the range (32-96 kg ha(-1)) indicated that south-west Australian lupin crops provide somewhat variably sized pools of mineralizeable crop residues for following cereal growth.",
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    The nitrogen economy of broadacre lupin in southwest Australia. / Unkovich, M.J.; Pate, John; Hamblin, J.

    In: Crop and Pasture Science, Vol. 45, 1994, p. 149-164.

    Research output: Contribution to journalArticle

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    AU - Hamblin, J.

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    AB - The time courses of above- and below-ground accumulation of biomass and N were followed in a crop of narrowleaf lupin (Lupinus angustifolius L. cv. Illyarrie) at Geraldton, W.A., and concurrent N-2 fixation assessed using the N-15 natural abundance technique. Crop biomass peaked at 10 t DM and 231 kg N ha(-1) with 13% of this N below ground. The crop accumulated the bulk (90 degrees) of its N through symbiotic N-2 fixation. Of the 164 kg total plant N ha(-1) remaining in recoverable biomass at maturity 44 degrees was recovered as grain, 49 degrees as other above-ground residues and 7% as roots. Despite a decrease in recoverable N of 67 kg ha(-1) between peak biomass and maturity, 96 kg N ha(-1) was returned as crop residues after grain harvest. Investigation of six farm crops in the study region gave values for nitrogen accumulation at peak biomass ranging from 199 to 372 kg ha(-1) of which, on average, 86% (222 kg ha(-1)) was fixed from the atmosphere. Predicted N returns to the soil from fixation averaged 65 kg ha(-1), though the range (32-96 kg ha(-1)) indicated that south-west Australian lupin crops provide somewhat variably sized pools of mineralizeable crop residues for following cereal growth.

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