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Shoot fresh weights (g) of several crop species grown for 7·5 weeks supplied with basal nutrients and 0 (0-P) or 40 mg P kg−1 dry sand in the form of soluble KH2PO4 (K-P), or sparingly soluble AlPO4 (Al-P), FePO4 (Fe-P), or Ca5OH(PO4)3 (Ca-P) (n = 14). When Pi is supplied in sparingly soluble forms, Lupinus albus and L. cosentinii, which combine high carboxylate release with the formation of cluster roots, performed best.
