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Manganese toxicity in pasture legumes

II. Effects of pH and molybdenum levels in the substrate

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Summary

The effects of pH and Mo levels in the growing media on Mn toxicity were investigated for white clover and five tropical pasture legume species.

In solution culture, high Mo supply did not influence Mn toxicity. However, in two species, it caused Mo toxicity.

High solution pH intensified Mn toxicity in white clover, probably by way of uptake. The effects of Ca and P on Mn toxicity reported in a previous paper, were not greatly influenced by solution pH.

In the soil, Mo application greatly increased dry matter yield of white clover grown on soils high in exchangeable Mn. This effect was more easily attributed to an influence on N metabolism of the legume plant than on Mn toxicity.

Measured soil pH was found to have little influence on the level of exchangeable Mn in the soil. However the larger pH changes in small soil pockets, resulting from non-uniform incorporation of chemicals in the soil, might have a more important effect on this fraction of soil Mn.

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Truong, N.V., Andrew, C.S. & Wilson, G.L. Manganese toxicity in pasture legumes. Plant Soil 34, 547–560 (1971). https://doi.org/10.1007/BF01372812

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  • DOI: https://doi.org/10.1007/BF01372812

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