Login | Request Account (DAF staff only)

Effects of humic and fulvic acids on the rhizotoxicity of lanthanum and aluminium to corn

Share this record

Add to FacebookAdd to LinkedinAdd to XAdd to WechatAdd to Microsoft_teamsAdd to WhatsappAdd to Any

Export this record

View Altmetrics

Diatloff, E., Harper, S.M., Asher, C.J. and Smith, F.W. (1998) Effects of humic and fulvic acids on the rhizotoxicity of lanthanum and aluminium to corn. Australian Journal of Soil Research, 36 (6). pp. 913-920. ISSN 0004-9573


Article Link: https://doi.org/10.1071/S98018


Effects of varying lanthanum (La) or aluminium (Al) concentrations (0-30 µM) on corn (Zea mays L.) root elongation were examined in the presence and absence of (i) humic acid (HA) at 35 mg carbon (C)/L, or (ii) fulvic acid (FA) at 15 mg C/L, using dilute nutrient solutions. The organic acids were extracted from a mixture of decomposed grass (Sorghum halepense) and lucerne (Medicago sativa) hay. In the absence of added HA or FA, the addition of La at ≥5 µM and Al at 30 µM was toxic to the root growth of corn. The rhizotoxic effects of La at 5 and 10 µM were negated by HA. The ability of FA to overcome La rhizotoxicity was much less, significantly ameliorating the toxic effects of 5 µM La but not those of 10 or 30 µM La. HA and FA did not precipitate La from solution. Both organic acids ameliorated Al toxicity by complexing Al and reducing monomeric Al in solution.
It is concluded that concentrations of HA and FA, commonly present in soil solutions, are capable of forming non-rhizotoxic complexes with La, hence plant tolerance to La in the soil solution may be appreciably higher than would be indicated by results of solution culture experiments in which these ligands are not present.

Item Type:Article
Keywords:Al, La, root length, root growth, trivalent cation, toxicity
Subjects:Agriculture > Agriculture (General) > Soils. Soil science > Soil chemistry
Agriculture > Agriculture (General) > Soils. Soil science > Soil and crops. Soil-plant relationships. Soil productivity
Live Archive:15 Mar 2024 02:09
Last Modified:15 Mar 2024 02:09

Repository Staff Only: item control page


Downloads per month over past year

View more statistics