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Effect of solubility of applied phosphate on the growth of narrow-leafed Lupin (Lupinus angustifolius L.)

Fertilizer Research, ISSN: 0167-1731, Vol: 13, Issue: 2, Page: 117-125
1987
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The response of narrow-leafed lupins (Lupinus angustifolius L. cv. Illyarrie) to phosphorus (P) fertilizer applied as single superphosphate (super), as an elemental-sulphur-enriched, partially acidulated rock phosphate (esparp) and as biosuper, was investigated in a glasshouse pot trial. Measurements of plant yield and P uptake were recorded 41 and 76 days after sowing. Both dry matter production and P uptake from esparp and super were proportional to the amount of water soluble P added to the pots indicating that the non-water-soluble fractions from these fertilizers were not taken up by the lupin plants. A small amount of initially insoluble P from the higher rates of biosuper was taken up by day 76. Thus superphosphate was clearly the most effective P source for this lupin species followed by esparp while biosuper was ineffective. Similar responses were recorded for pod and nodule dry weights. It was concluded that less soluble P sources were not suitable as fertilizers in lupin production due to the poor response in P uptake, dry matter accumulation and nodulation. © 1987 Martinus Nijhoff Publishers.

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